Re: [time-nuts] Temperature (environmental) sensors

[Hal Murray]

jim...@earthlink.net said:
> I'm kind of curious about their "UI".. hold CapsLock? how does this  device
> manifest itself to the host computer? I saw a mention of HID, so  it is
> emulating a keyboard? 

I have a couple of the non-Gold versions.  Plastic with a push button.  They 
have one sensor in the USB blob and a second sensor on a 3ft cable.  There is 
Linux code that lets you grab a reading when you want.
2017/01/05 12:40:03
Temperature (internal) 76.21F 24.56C
Temperature (external) 72.39F 22.44C

Yes, it's HID.  I don't know anything about that area.  The Linux code is 
big/ugly (my opinion) enough that I didn't just extract the few lines of code 
to stuff into my code but called their run-from-the-shell package.  It's open 
source so it shouldn't be too hard to figure out how it works.


Dec 27 04:02:54 deb kernel: [3857654.032036] usb 3-3: new low-speed USB 
device number 6 using ohci_hcd
Dec 27 04:02:55 deb kernel: [3857654.246845] usb 3-3: New USB device found, 
idVendor=0c45, idProduct=7401
Dec 27 04:02:55 deb kernel: [3857654.246854] usb 3-3: New USB device strings: 
Mfr=1, Product=2, SerialNumber=0
Dec 27 04:02:55 deb kernel: [3857654.246861] usb 3-3: Product: 
TEMPer2_M12_V1.3
Dec 27 04:02:55 deb kernel: [3857654.246867] usb 3-3: Manufacturer: RDing
Dec 27 04:02:55 deb kernel: [3857654.258488] input: RDing TEMPer2_M12_V1.3 as 
/devices/pci:00/:00:03.1/usb3/3-3/3-3:1.0/input/input7
Dec 27 04:02:55 deb kernel: [3857654.259140] generic-usb 0003:0C45:7401.0007: 
input,hidraw0: USB HID v1.10 Keyboard [RDing TEMPer2_M12_V1.3] on 
usb-:00:03.1-3/input0
Dec 27 04:02:55 deb kernel: [3857654.266134] generic-usb 0003:0C45:7401.0008: 
hiddev0,hidraw1: USB HID v1.10 Device [RDing TEMPer2_M12_V1.3] on 
usb-:00:03.1-3/input1

The blurb for the Gold version said LM75.  I haven't taken the cover off a 
non Gold version.


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Re: [time-nuts] Temperature (environmental) sensors

[Gary E. Miller]

Yo jimlux!
 
 On Thu, 5 Jan 2017 12:21:44 -0800
 jimlux  wrote:
 
> I'm kind of curious about their "UI".. hold CapsLock? how does this 
> device manifest itself to the host computer? I saw a mention of HID,
> so it is emulating a keyboard?  

I received serveral off list requests, so I looked into this a bit more.

As I said before, I use temper-python on Linux to read my TEMPer's:
 
https://github.com/padelt/temper-python

All you need to run that program is Python and the pyusb library:

https://pypi.python.org/pypi/pyusb/1.0.0

Python runs on pretty much anything half-way sane.  pyusb runs on
Linux, Windblows, OS X, and most POSIX systems.

The paranoids will want to run Wireshark in USB capture mode to be
sure nothing devious is going on.

RGDS Veritas liberabit vos
GARY Quid est veritas?
---
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
g...@rellim.com  Tel:+1 541 382 8588


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Re: [time-nuts] Temperature (environmental) sensors

[Gary E. Miller]

Yo jimlux!

On Thu, 5 Jan 2017 12:21:44 -0800
jimlux  wrote:

> > http://www.pcsensor.com/usb-hygrometer/temperhum.html  
> 
> I'm kind of curious about their "UI".. hold CapsLock? how does this 
> device manifest itself to the host computer? I saw a mention of HID,
> so it is emulating a keyboard?

It presents to the host OS as an HID/Keyboard,, but sends no data by
default.  I run it on Linux and use the following FOSS Python program to
read it:

https://github.com/padelt/temper-python

Looking at the Python code, a simple binary packet is sent to the
device and it returns a binary packet with the data.

I can't speak to how it works on anything but Linux.  I've never seen
the TEMPer interfere with anything.

RGDS Veritas liberabit vos
GARY Quid est veritas?
---
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
g...@rellim.com  Tel:+1 541 382 8588


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Re: [time-nuts] Temperature (environmental) sensors

[jimlux]

On 1/5/17 11:15 AM, Gary E. Miller wrote:

Yo All!

I am surprised that the TEMPer and TEMPerHUM have not been mentioned
yet.  They are cheap reliable USB temperature sensors.  The TEMPerHUM
adds a humidity sensor.

I have several TEMPer's running to log room temp around NTP servers.

The basic TEMPer reads to 0.1°F is only $9:

http://www.pcsensor.com/usb-thermometers/gold-temper.html

I can't speak to its accuracy, but it tracks well with my OXO's frequency
shifts.

There is the double sensor TEMPER for about $19:

http://www.pcsensor.com/usb-thermometer/temper2.html

I do NOT recommend this one.  The external temp will not match the internal
temp.  When I put an IR camera on it I found the external temp sensor
self heats in free ait by several degrees F.

I have not tried the TEMPerHum.  It adds a humidity sensor and is $20:

http://www.pcsensor.com/usb-hygrometer/temperhum.html


I'm kind of curious about their "UI".. hold CapsLock? how does this 
device manifest itself to the host computer? I saw a mention of HID, so 
it is emulating a keyboard?


(which, by the way, is the current strategy for infecting computers with 
USB thumb drives you leave in the parking lot of your victim.. it works 
as a thumb drive, except it also looks for other interesting traffic and 
injects a payload at that time, as if you were on a keyboard..)


https://www.schneier.com/blog/archives/2014/07/the_fundamental.html




From what I can tell, many different Chinese companies make TEMPer's so
YMMV.  But hard to go wrong for $9.

RGDS Veritas liberabit vos
GARY Quid est veritas?
---
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
g...@rellim.com  Tel:+1 541 382 8588



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Re: [time-nuts] Temperature (environmental) sensors

[Gary E. Miller]

Yo All!

I am surprised that the TEMPer and TEMPerHUM have not been mentioned
yet.  They are cheap reliable USB temperature sensors.  The TEMPerHUM
adds a humidity sensor.

I have several TEMPer's running to log room temp around NTP servers.

The basic TEMPer reads to 0.1°F is only $9:

http://www.pcsensor.com/usb-thermometers/gold-temper.html

I can't speak to its accuracy, but it tracks well with my OXO's frequency
shifts.

There is the double sensor TEMPER for about $19:

http://www.pcsensor.com/usb-thermometer/temper2.html

I do NOT recommend this one.  The external temp will not match the internal
temp.  When I put an IR camera on it I found the external temp sensor
self heats in free ait by several degrees F.

I have not tried the TEMPerHum.  It adds a humidity sensor and is $20:

http://www.pcsensor.com/usb-hygrometer/temperhum.html

From what I can tell, many different Chinese companies make TEMPer's so
YMMV.  But hard to go wrong for $9.

RGDS Veritas liberabit vos
GARY Quid est veritas?
---
Gary E. Miller Rellim 109 NW Wilmington Ave., Suite E, Bend, OR 97703
g...@rellim.com  Tel:+1 541 382 8588


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Re: [time-nuts] Temperature (environmental) sensors

[albertson . chris]

Right on the page at adafruit there is a downloads link. This gets you to 
software read data from the board.   It uses SPI

Use one of those $3 arduino nanos to talk spi to the sensor and USB to a 
computer.   The linked software does that

> On Jan 4, 2017, at 11:32 AM, Dan Kemppainen  wrote:
> 
> does anyone on the list have 16Bit PIC code (pic24/dsPIC) C code for reading 
> these BME280 sensors laying around?
> 
> They really look like a neat little unit. Thanks to all for the heads up on 
> these ones!
> 
> Dan
> 
> 
> 
> 
>> 
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Re: [time-nuts] Temperature (environmental) sensors

[Didier Juges]

I have C code (for the 8051) that is simply the translation of what's in the 
app note. It does temperature and humidity but not the barometric pressure (no 
double precision float on that compiler).

Works exactly as advertised. I have two.

You can see one in action here:

http://www.ko4bb.com/tps/plottemp.php?file=D8B04CF343D6.csv=day

This is my wife's green house, with temperature in C and F and humidity.

Let me know if you are interested.

Didier KO4BB 


On January 4, 2017 1:32:24 PM CST, Dan Kemppainen <d...@irtelemetrics.com> 
wrote:
>Hi All,
>
>Just ordered a few of these BME280 sensor boards. Also ordered a FTDI 
>C232HM cable to try to SPI or to bit-bang data from the board directly 
>to the PC. If a PIC or similar is required, does anyone on the list
>have 
>16Bit PIC code (pic24/dsPIC) C code for reading these BME280 sensors 
>laying around?
>
>They really look like a neat little unit. Thanks to all for the heads
>up 
>on these ones!
>
>Dan
>
>
>
>
>On 1/4/2017 12:00 PM, time-nuts-requ...@febo.com wrote:
>> Message: 7
>> Date: Wed, 4 Jan 2017 09:53:24 -
>> From: "David J Taylor" <david-tay...@blueyonder.co.uk>
>> To: "Discussion of precise time and frequency measurement"
>>  <time-nuts@febo.com>
>> Subject: Re: [time-nuts] Temperature (environmental) sensors
>> Message-ID: <076CCA551DC142C2A8D93CF02A4AD1A3@Alta>
>> Content-Type: text/plain; format=flowed; charset="UTF-8";
>>  reply-type=original
>>
>> I like the Bosch BME280 conneced to a Raspberry PI.
>>
>https://learn.adafruit.com/adafruit-bme280-humidity-barometric-pressure-temperature-sensor-breakout/pinouts
>>
>https://github.com/adafruit/Adafruit_Python_BME280/blob/master/README.md
>> --   Björn
>> 
>>
>> Some performance plots are here, with some comparison between the
>pressure
>> readings from various sensors.
>>
>>   http://www.satsignal.eu/mrtg/performance_air_temp.php
>>
>> This is on mixed Windows/Linux platforms.
>>
>> Cheers,
>> David
>> -- SatSignal Software - Quality software written to your requirements
>> Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk
>> Twitter: @gm8arv
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-- 
Sent from my Moto-X wireless tracker while I do other things.
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Re: [time-nuts] Temperature (environmental) sensors

[Dan Kemppainen]

Hi All,

Just ordered a few of these BME280 sensor boards. Also ordered a FTDI 
C232HM cable to try to SPI or to bit-bang data from the board directly 
to the PC. If a PIC or similar is required, does anyone on the list have 
16Bit PIC code (pic24/dsPIC) C code for reading these BME280 sensors 
laying around?


They really look like a neat little unit. Thanks to all for the heads up 
on these ones!


Dan




On 1/4/2017 12:00 PM, time-nuts-requ...@febo.com wrote:

Message: 7
Date: Wed, 4 Jan 2017 09:53:24 -
From: "David J Taylor" <david-tay...@blueyonder.co.uk>
To: "Discussion of precise time and frequency measurement"
<time-nuts@febo.com>
Subject: Re: [time-nuts] Temperature (environmental) sensors
Message-ID: <076CCA551DC142C2A8D93CF02A4AD1A3@Alta>
Content-Type: text/plain; format=flowed; charset="UTF-8";
reply-type=original

I like the Bosch BME280 conneced to a Raspberry PI.
https://learn.adafruit.com/adafruit-bme280-humidity-barometric-pressure-temperature-sensor-breakout/pinouts
https://github.com/adafruit/Adafruit_Python_BME280/blob/master/README.md
--   Björn


Some performance plots are here, with some comparison between the pressure
readings from various sensors.

  http://www.satsignal.eu/mrtg/performance_air_temp.php

This is on mixed Windows/Linux platforms.

Cheers,
David
-- SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv

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Re: [time-nuts] Temperature (environmental) sensors

[David J Taylor]

I like the Bosch BME280 conneced to a Raspberry PI.
https://learn.adafruit.com/adafruit-bme280-humidity-barometric-pressure-temperature-sensor-breakout/pinouts
https://github.com/adafruit/Adafruit_Python_BME280/blob/master/README.md
--   Björn


Some performance plots are here, with some comparison between the pressure 
readings from various sensors.


 http://www.satsignal.eu/mrtg/performance_air_temp.php

This is on mixed Windows/Linux platforms.

Cheers,
David
--
SatSignal Software - Quality software written to your requirements
Web: http://www.satsignal.eu
Email: david-tay...@blueyonder.co.uk
Twitter: @gm8arv 


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Re: [time-nuts] Temperature (environmental) sensors

[bg]

I like the Bosch BME280 conneced to a Raspberry PI.
https://learn.adafruit.com/adafruit-bme280-humidity-barometric-pressure-temperature-sensor-breakout/pinouts
https://github.com/adafruit/Adafruit_Python_BME280/blob/master/README.md
--   Björn
Sent from my smartphone.
 Original message From: Bob Camp <kb...@n1k.org> Date: 
03/01/2017  19:36  (GMT+01:00) To: Discussion of precise time and frequency 
measurement <time-nuts@febo.com> Subject: Re: [time-nuts] Temperature 
(environmental) sensors 
Hi

There’s always the “cool factor” of higher resolution. Apparently it’s not 
enough
of a issue to make it a worthwhile market to serve.  

Based on what has been tossed around, it sounds like an Arduino with some 
bits plugged in is the low cost leader. 3D print up and enclosure and you have 
it all in a some large form factor.

Bob

> On Jan 3, 2017, at 12:54 PM, jimlux <jim...@earthlink.net> wrote:
> 
> On 1/3/17 9:15 AM, Bob Camp wrote:
>> Hi
>> 
>> There is an ever increasing pool of good sensors to put into something like 
>> this.
>> (More so for temperature and pressure. Humidity still is a bit of an issue.)
>> There’s not a lot to interface between the sensor and a USB “chip”. It’s 
>> surprising
>> that there aren’t more cheap / high accuracy choices out there.
>> 
> 
> 
> the market probably isn't there for a cheap "pod" with an interface and high 
> accuracy..
> 
> The Lascar units (and similar $100-ish ones from others) meet most of the 
> existing need fairly well (e.g. monitoring the temperature of your freezer 
> for FDA regulatory compliance, monitoring the temp and humidity in your ESD 
> controlled space)..
> 
> The need for 0.1 degree C room temp measurement is, I think, fairly limited
> 
> 
> 
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Re: [time-nuts] Temperature (environmental) sensors

[Robert Atkinson via time-nuts]

I've used the Dallas (now Maxim) Thermochron iButtons in several applications. 
Looks like a thick coin with battery, ram and RTC built in. Even used dozens of 
them map temperature distribution in a aircraft fuel tank. Also available as a 
1-wire device. For precision I've used Pico Technology PT105 4 channel PRD 
interfaces.
Robert G8RPI.


  From: jimlux <jim...@earthlink.net>
 To: time-nuts@febo.com 
 Sent: Tuesday, 3 January 2017, 15:22
 Subject: Re: [time-nuts] Temperature (environmental) sensors
   
On 1/3/17 7:08 AM, Tom Van Baak wrote:
> I have some high-end temperature and pressure instruments. But for casual use 
> in my home and mobile timing lab I use Sparkfun Weather Stations. The old URL 
> is:
>
>    https://www.sparkfun.com/products/retired/10586
>

Replaced by
https://www.sparkfun.com/products/12081
which doesn't have the USB.

By the time you add a board with a processor, you're in the $50 range..

I use these at work:

https://www.lascarelectronics.com/easylog-data-logger-el-usb-rt/
Well, actually I use the EL-USB-2-LCD.. which logs to internal memory 
and can't log/unload data at the same time and which requires a windows 
program.

That said, they work well, come with a traceable cal certificate, etc. 
I don't know that they do 0.1 degree (the data sheet says 0.5C, and I 
think that's the logging accuracy), and, well, humidity sensors are of 
dubious accuracy away from the middle of the range

https://www.lascarelectronics.com/easylog-data-logger-el-usb-2-lcd/






> It's USB, talk-only, one reading a second, temperature, pressure, humidity -- 
> about as simple as you can get. Perfect for data logging along with frequency 
> standards, GPS, counters and such.
>
> But they don't make 'em anymore. My question is what similar well-engineered, 
> talk-only, serial or USB, temperature-pressure-humidity sensors have you run 
> across and could recommend? Not to be picky bit no cheapo 1C or 0.5C sensors; 
> 0.1C or better is ok.
>
> I know it's "easy" to throw one together with an Arduino, but I'm looking for 
> something pre-packaged, something that reliably works, out-of-the-box. I have 
> backup plans but hope someone on the list knows some products they have used 
> and would recommend.
>
> We could extend the discussion to voltage and power monitors too. Or some 
> kind of universal sensor TAPR project. But for now, let's just keep it to 
> simple air / environmental sensing.
>
> Thanks,
> /tvb
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Re: [time-nuts] Temperature (environmental) sensors

[Brooke Clarke]

Hi Tom:

I've used the Onset data loggers and they are very inexpensive and work well.  
As a plus they are PIC based so hackable.
Don't know about accuracy, resolution 
http://www.onsetcomp.com/products/data-loggers
http://www.prc68.com/I/Hobo.html
http://www.prc68.com/I/GPend.shtml
The "Pendant" devices use an optical 2-way link to USB so there is no 
penetration in their water tight enclosure.

--
Have Fun,

Brooke Clarke
http://www.PRC68.com
http://www.end2partygovernment.com/2012Issues.html
The lesser of evils is still evil.

 Original Message 

I have some high-end temperature and pressure instruments. But for casual use 
in my home and mobile timing lab I use Sparkfun Weather Stations. The old URL 
is:

 https://www.sparkfun.com/products/retired/10586

It's USB, talk-only, one reading a second, temperature, pressure, humidity -- 
about as simple as you can get. Perfect for data logging along with frequency 
standards, GPS, counters and such.

But they don't make 'em anymore. My question is what similar well-engineered, 
talk-only, serial or USB, temperature-pressure-humidity sensors have you run 
across and could recommend? Not to be picky bit no cheapo 1C or 0.5C sensors; 
0.1C or better is ok.

I know it's "easy" to throw one together with an Arduino, but I'm looking for 
something pre-packaged, something that reliably works, out-of-the-box. I have backup 
plans but hope someone on the list knows some products they have used and would recommend.

We could extend the discussion to voltage and power monitors too. Or some kind 
of universal sensor TAPR project. But for now, let's just keep it to simple air 
/ environmental sensing.

Thanks,
/tvb
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Re: [time-nuts] Temperature (environmental) sensors

[Daniel Mendes]

Yesterday hackaday had a link to a humidy sensor comparison:

http://www.kandrsmith.org/RJS/Misc/Hygrometers/calib_many.html


Em 03/01/2017 16:03, Mark Sims escreveu:

I did a LOT of testing environmental sensors when I built my ultrasonic 
anemometer weather station that is part of a rocket launch control system.  The 
best humidity sensor I found was the DHT21/SHT11/AM2301/SHT15.  They run around 
$3 and can also provide temperature to 0.1C res / 0.5C accuracy.  I tested lots 
of MUCH more expensive humidity sensors and that one agreed the best to my lab 
grade Vasilia.  That said,  all humidity sensors are rather sucky.

For pressure the MS5611 sensor was, by far, the best.  It can measure the 
pressure change equivalent to less than a foot of altitude.   It can also 
provide a high-res temperature reading (of the sensor, not the environment).  
It uses 24 bit A/D converters.  I use a 10 DOF IMU board from Ebay ($10) or you 
can get the sensor only on a board for around $7.

The weather station board uses a ATMEGA32 to read all the sensors and outputs 
an RS-232 stream that looks like NMEA data.  It uses four $1 SR04 ultrasonic  
sensors to measure wind velocity/direction/air temperature.  It also supports a 
UV intensity sensor.  It uses the magnetometer/accelerometers on the IMU board 
as a digital compass so you don't have to orient the anemometer to north.  I've 
used the board without the ultrasonics as an environmental sensor.

I use sensor noise from the IMUs and Atmel ADCs to implement a true random 
number generator that feeds the crypto systems that protect the launch 
controllers from neer-do-wells.  The TRNG output passes all tests of randomness 
with flying colors.



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Re: [time-nuts] Temperature (environmental) sensors

[Adrian Godwin]

The sensor Jim linked :

 Temp/humidity with I2C interface
https://www.adafruit.com/products/1293

looks good - packaged, high res temperature, etc. It's not 'complete' in
that it's only a sensor, but you only have to attach a USB-I2C adapter.
Probably less work than connecting up the sparkfun board.



On Tue, Jan 3, 2017 at 6:08 PM, Scott Stobbe 
wrote:

> The good news is if the dataloger you get has a mems pressure sensor, you
> will have a high precision temperature sensor, whether or not the product
> software provides that resolution to you is another matter. In addition to
> the piezo-resistive bridge being mechanically sensitive to diaphragm
> strain, they are also great thermistors. Which ends up requiring a high
> resolution temperature sensor to temperature compensate the bridge
> readings.
>
> Two related but off target products I would personally recommend is picking
> up a used EeePC as a usb data sink. I bought one of the originals back
> almost 10 years ago, and I still find it to come in handy once in awhile
> versus a rasperry pi, you could likely pick one up for nothing today. A USB
> labjack works quite well to tack up a few thermistors to a DUT for logging,
> it also has full driver support for linux/windows with a python interface
> (other languages too).
>
> On Tue, Jan 3, 2017 at 10:08 AM, Tom Van Baak  wrote:
>
> > I have some high-end temperature and pressure instruments. But for casual
> > use in my home and mobile timing lab I use Sparkfun Weather Stations. The
> > old URL is:
> >
> > https://www.sparkfun.com/products/retired/10586
> >
> > It's USB, talk-only, one reading a second, temperature, pressure,
> humidity
> > -- about as simple as you can get. Perfect for data logging along with
> > frequency standards, GPS, counters and such.
> >
> > But they don't make 'em anymore. My question is what similar
> > well-engineered, talk-only, serial or USB, temperature-pressure-humidity
> > sensors have you run across and could recommend? Not to be picky bit no
> > cheapo 1C or 0.5C sensors; 0.1C or better is ok.
> >
> > I know it's "easy" to throw one together with an Arduino, but I'm looking
> > for something pre-packaged, something that reliably works,
> out-of-the-box.
> > I have backup plans but hope someone on the list knows some products they
> > have used and would recommend.
> >
> > We could extend the discussion to voltage and power monitors too. Or some
> > kind of universal sensor TAPR project. But for now, let's just keep it to
> > simple air / environmental sensing.
> >
> > Thanks,
> > /tvb
> > ___
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/
> > mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
> ___
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> mailman/listinfo/time-nuts
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Re: [time-nuts] Temperature (environmental) sensors

[Bob Camp]

Hi

There’s always the “cool factor” of higher resolution. Apparently it’s not 
enough
of a issue to make it a worthwhile market to serve.  

Based on what has been tossed around, it sounds like an Arduino with some 
bits plugged in is the low cost leader. 3D print up and enclosure and you have 
it all in a some large form factor.

Bob

> On Jan 3, 2017, at 12:54 PM, jimlux  wrote:
> 
> On 1/3/17 9:15 AM, Bob Camp wrote:
>> Hi
>> 
>> There is an ever increasing pool of good sensors to put into something like 
>> this.
>> (More so for temperature and pressure. Humidity still is a bit of an issue.)
>> There’s not a lot to interface between the sensor and a USB “chip”. It’s 
>> surprising
>> that there aren’t more cheap / high accuracy choices out there.
>> 
> 
> 
> the market probably isn't there for a cheap "pod" with an interface and high 
> accuracy..
> 
> The Lascar units (and similar $100-ish ones from others) meet most of the 
> existing need fairly well (e.g. monitoring the temperature of your freezer 
> for FDA regulatory compliance, monitoring the temp and humidity in your ESD 
> controlled space)..
> 
> The need for 0.1 degree C room temp measurement is, I think, fairly limited
> 
> 
> 
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Re: [time-nuts] Temperature (environmental) sensors

[Scott Stobbe]

The good news is if the dataloger you get has a mems pressure sensor, you
will have a high precision temperature sensor, whether or not the product
software provides that resolution to you is another matter. In addition to
the piezo-resistive bridge being mechanically sensitive to diaphragm
strain, they are also great thermistors. Which ends up requiring a high
resolution temperature sensor to temperature compensate the bridge readings.

Two related but off target products I would personally recommend is picking
up a used EeePC as a usb data sink. I bought one of the originals back
almost 10 years ago, and I still find it to come in handy once in awhile
versus a rasperry pi, you could likely pick one up for nothing today. A USB
labjack works quite well to tack up a few thermistors to a DUT for logging,
it also has full driver support for linux/windows with a python interface
(other languages too).

On Tue, Jan 3, 2017 at 10:08 AM, Tom Van Baak  wrote:

> I have some high-end temperature and pressure instruments. But for casual
> use in my home and mobile timing lab I use Sparkfun Weather Stations. The
> old URL is:
>
> https://www.sparkfun.com/products/retired/10586
>
> It's USB, talk-only, one reading a second, temperature, pressure, humidity
> -- about as simple as you can get. Perfect for data logging along with
> frequency standards, GPS, counters and such.
>
> But they don't make 'em anymore. My question is what similar
> well-engineered, talk-only, serial or USB, temperature-pressure-humidity
> sensors have you run across and could recommend? Not to be picky bit no
> cheapo 1C or 0.5C sensors; 0.1C or better is ok.
>
> I know it's "easy" to throw one together with an Arduino, but I'm looking
> for something pre-packaged, something that reliably works, out-of-the-box.
> I have backup plans but hope someone on the list knows some products they
> have used and would recommend.
>
> We could extend the discussion to voltage and power monitors too. Or some
> kind of universal sensor TAPR project. But for now, let's just keep it to
> simple air / environmental sensing.
>
> Thanks,
> /tvb
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
> and follow the instructions there.
>
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[time-nuts] Temperature (environmental) sensors

[Mark Sims]

I did a LOT of testing environmental sensors when I built my ultrasonic 
anemometer weather station that is part of a rocket launch control system.  The 
best humidity sensor I found was the DHT21/SHT11/AM2301/SHT15.  They run around 
$3 and can also provide temperature to 0.1C res / 0.5C accuracy.  I tested lots 
of MUCH more expensive humidity sensors and that one agreed the best to my lab 
grade Vasilia.  That said,  all humidity sensors are rather sucky.

For pressure the MS5611 sensor was, by far, the best.  It can measure the 
pressure change equivalent to less than a foot of altitude.   It can also 
provide a high-res temperature reading (of the sensor, not the environment).  
It uses 24 bit A/D converters.  I use a 10 DOF IMU board from Ebay ($10) or you 
can get the sensor only on a board for around $7.

The weather station board uses a ATMEGA32 to read all the sensors and outputs 
an RS-232 stream that looks like NMEA data.  It uses four $1 SR04 ultrasonic  
sensors to measure wind velocity/direction/air temperature.  It also supports a 
UV intensity sensor.  It uses the magnetometer/accelerometers on the IMU board 
as a digital compass so you don't have to orient the anemometer to north.  I've 
used the board without the ultrasonics as an environmental sensor.

I use sensor noise from the IMUs and Atmel ADCs to implement a true random 
number generator that feeds the crypto systems that protect the launch 
controllers from neer-do-wells.  The TRNG output passes all tests of randomness 
with flying colors.



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Re: [time-nuts] Temperature (environmental) sensors

[jimlux]

On 1/3/17 9:15 AM, Bob Camp wrote:

Hi

There is an ever increasing pool of good sensors to put into something like 
this.
(More so for temperature and pressure. Humidity still is a bit of an issue.)
There’s not a lot to interface between the sensor and a USB “chip”. It’s 
surprising
that there aren’t more cheap / high accuracy choices out there.




the market probably isn't there for a cheap "pod" with an interface and 
high accuracy..


The Lascar units (and similar $100-ish ones from others) meet most of 
the existing need fairly well (e.g. monitoring the temperature of your 
freezer for FDA regulatory compliance, monitoring the temp and humidity 
in your ESD controlled space)..


The need for 0.1 degree C room temp measurement is, I think, fairly limited



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Re: [time-nuts] Temperature (environmental) sensors

[Bob Camp]

Hi

There is an ever increasing pool of good sensors to put into something like 
this. 
(More so for temperature and pressure. Humidity still is a bit of an issue.)
There’s not a lot to interface between the sensor and a USB “chip”. It’s 
surprising 
that there aren’t more cheap / high accuracy choices out there. 

Bob

> On Jan 3, 2017, at 10:08 AM, Tom Van Baak  wrote:
> 
> I have some high-end temperature and pressure instruments. But for casual use 
> in my home and mobile timing lab I use Sparkfun Weather Stations. The old URL 
> is:
> 
>https://www.sparkfun.com/products/retired/10586
> 
> It's USB, talk-only, one reading a second, temperature, pressure, humidity -- 
> about as simple as you can get. Perfect for data logging along with frequency 
> standards, GPS, counters and such.
> 
> But they don't make 'em anymore. My question is what similar well-engineered, 
> talk-only, serial or USB, temperature-pressure-humidity sensors have you run 
> across and could recommend? Not to be picky bit no cheapo 1C or 0.5C sensors; 
> 0.1C or better is ok.
> 
> I know it's "easy" to throw one together with an Arduino, but I'm looking for 
> something pre-packaged, something that reliably works, out-of-the-box. I have 
> backup plans but hope someone on the list knows some products they have used 
> and would recommend.
> 
> We could extend the discussion to voltage and power monitors too. Or some 
> kind of universal sensor TAPR project. But for now, let's just keep it to 
> simple air / environmental sensing.
> 
> Thanks,
> /tvb
> ___
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> To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
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Re: [time-nuts] Temperature (environmental) sensors

[Jim Harman]

These
https://www.adafruit.com/products/381
are .0625C resolution, 1-wire interface (temp only)

This one
https://www.adafruit.com/products/642
has Teflon insulation, for use at higher temps

Or this one, Temp/humidity with I2C interface
https://www.adafruit.com/products/1293


On Tue, Jan 3, 2017 at 11:19 AM, Adrian Godwin  wrote:

> All these (including the one I linked) seem to be 0.5C only.
>
> This one gets to 0.2C : http://www.ti.com/tool/hdc1010evm
>
> On Tue, Jan 3, 2017 at 4:09 PM, Paul Alfille 
> wrote:
>
> > If you don't mind using 1-wire sensors, there are many nice choices,
> like:
> >
> > http://www.embeddeddatasystems.com/Environmental-Sensors_c_44.html for
> > temperature/humidity/barometric pressure...
> >
> >
> >
> > On Tue, Jan 3, 2017 at 10:22 AM, jimlux  wrote:
> >
> > > On 1/3/17 7:08 AM, Tom Van Baak wrote:
> > >
> > >> I have some high-end temperature and pressure instruments. But for
> > casual
> > >> use in my home and mobile timing lab I use Sparkfun Weather Stations.
> > The
> > >> old URL is:
> > >>
> > >> https://www.sparkfun.com/products/retired/10586
> > >>
> > >>
> > > Replaced by
> > > https://www.sparkfun.com/products/12081
> > > which doesn't have the USB.
> > >
> > > By the time you add a board with a processor, you're in the $50 range..
> > >
> > > I use these at work:
> > >
> > > https://www.lascarelectronics.com/easylog-data-logger-el-usb-rt/
> > > Well, actually I use the EL-USB-2-LCD.. which logs to internal memory
> and
> > > can't log/unload data at the same time and which requires a windows
> > program.
> > >
> > > That said, they work well, come with a traceable cal certificate, etc.
> I
> > > don't know that they do 0.1 degree (the data sheet says 0.5C, and I
> think
> > > that's the logging accuracy), and, well, humidity sensors are of
> dubious
> > > accuracy away from the middle of the range
> > >
> > > https://www.lascarelectronics.com/easylog-data-logger-el-usb-2-lcd/
> > >
> > >
> > >
> > >
> > >
> > >
> > >
> > > It's USB, talk-only, one reading a second, temperature, pressure,
> > humidity
> > >> -- about as simple as you can get. Perfect for data logging along with
> > >> frequency standards, GPS, counters and such.
> > >>
> > >> But they don't make 'em anymore. My question is what similar
> > >> well-engineered, talk-only, serial or USB,
> temperature-pressure-humidity
> > >> sensors have you run across and could recommend? Not to be picky bit
> no
> > >> cheapo 1C or 0.5C sensors; 0.1C or better is ok.
> > >>
> > >> I know it's "easy" to throw one together with an Arduino, but I'm
> > looking
> > >> for something pre-packaged, something that reliably works,
> > out-of-the-box.
> > >> I have backup plans but hope someone on the list knows some products
> > they
> > >> have used and would recommend.
> > >>
> > >> We could extend the discussion to voltage and power monitors too. Or
> > some
> > >> kind of universal sensor TAPR project. But for now, let's just keep it
> > to
> > >> simple air / environmental sensing.
> > >>
> > >> Thanks,
> > >> /tvb
> > >> ___
> > >> time-nuts mailing list -- time-nuts@febo.com
> > >> To unsubscribe, go to https://www.febo.com/cgi-bin/m
> > >> ailman/listinfo/time-nuts
> > >> and follow the instructions there.
> > >>
> > >>
> > > ___
> > > time-nuts mailing list -- time-nuts@febo.com
> > > To unsubscribe, go to https://www.febo.com/cgi-bin/m
> > > ailman/listinfo/time-nuts
> > > and follow the instructions there.
> > >
> > ___
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/
> > mailman/listinfo/time-nuts
> > and follow the instructions there.
> >
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-- 

--Jim Harman
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Re: [time-nuts] Temperature (environmental) sensors

[Adrian Godwin]

All these (including the one I linked) seem to be 0.5C only.

This one gets to 0.2C : http://www.ti.com/tool/hdc1010evm

On Tue, Jan 3, 2017 at 4:09 PM, Paul Alfille  wrote:

> If you don't mind using 1-wire sensors, there are many nice choices, like:
>
> http://www.embeddeddatasystems.com/Environmental-Sensors_c_44.html for
> temperature/humidity/barometric pressure...
>
>
>
> On Tue, Jan 3, 2017 at 10:22 AM, jimlux  wrote:
>
> > On 1/3/17 7:08 AM, Tom Van Baak wrote:
> >
> >> I have some high-end temperature and pressure instruments. But for
> casual
> >> use in my home and mobile timing lab I use Sparkfun Weather Stations.
> The
> >> old URL is:
> >>
> >> https://www.sparkfun.com/products/retired/10586
> >>
> >>
> > Replaced by
> > https://www.sparkfun.com/products/12081
> > which doesn't have the USB.
> >
> > By the time you add a board with a processor, you're in the $50 range..
> >
> > I use these at work:
> >
> > https://www.lascarelectronics.com/easylog-data-logger-el-usb-rt/
> > Well, actually I use the EL-USB-2-LCD.. which logs to internal memory and
> > can't log/unload data at the same time and which requires a windows
> program.
> >
> > That said, they work well, come with a traceable cal certificate, etc. I
> > don't know that they do 0.1 degree (the data sheet says 0.5C, and I think
> > that's the logging accuracy), and, well, humidity sensors are of dubious
> > accuracy away from the middle of the range
> >
> > https://www.lascarelectronics.com/easylog-data-logger-el-usb-2-lcd/
> >
> >
> >
> >
> >
> >
> >
> > It's USB, talk-only, one reading a second, temperature, pressure,
> humidity
> >> -- about as simple as you can get. Perfect for data logging along with
> >> frequency standards, GPS, counters and such.
> >>
> >> But they don't make 'em anymore. My question is what similar
> >> well-engineered, talk-only, serial or USB, temperature-pressure-humidity
> >> sensors have you run across and could recommend? Not to be picky bit no
> >> cheapo 1C or 0.5C sensors; 0.1C or better is ok.
> >>
> >> I know it's "easy" to throw one together with an Arduino, but I'm
> looking
> >> for something pre-packaged, something that reliably works,
> out-of-the-box.
> >> I have backup plans but hope someone on the list knows some products
> they
> >> have used and would recommend.
> >>
> >> We could extend the discussion to voltage and power monitors too. Or
> some
> >> kind of universal sensor TAPR project. But for now, let's just keep it
> to
> >> simple air / environmental sensing.
> >>
> >> Thanks,
> >> /tvb
> >> ___
> >> time-nuts mailing list -- time-nuts@febo.com
> >> To unsubscribe, go to https://www.febo.com/cgi-bin/m
> >> ailman/listinfo/time-nuts
> >> and follow the instructions there.
> >>
> >>
> > ___
> > time-nuts mailing list -- time-nuts@febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/m
> > ailman/listinfo/time-nuts
> > and follow the instructions there.
> >
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Re: [time-nuts] Temperature (environmental) sensors

[Paul Alfille]

If you don't mind using 1-wire sensors, there are many nice choices, like:

http://www.embeddeddatasystems.com/Environmental-Sensors_c_44.html for
temperature/humidity/barometric pressure...



On Tue, Jan 3, 2017 at 10:22 AM, jimlux  wrote:

> On 1/3/17 7:08 AM, Tom Van Baak wrote:
>
>> I have some high-end temperature and pressure instruments. But for casual
>> use in my home and mobile timing lab I use Sparkfun Weather Stations. The
>> old URL is:
>>
>> https://www.sparkfun.com/products/retired/10586
>>
>>
> Replaced by
> https://www.sparkfun.com/products/12081
> which doesn't have the USB.
>
> By the time you add a board with a processor, you're in the $50 range..
>
> I use these at work:
>
> https://www.lascarelectronics.com/easylog-data-logger-el-usb-rt/
> Well, actually I use the EL-USB-2-LCD.. which logs to internal memory and
> can't log/unload data at the same time and which requires a windows program.
>
> That said, they work well, come with a traceable cal certificate, etc. I
> don't know that they do 0.1 degree (the data sheet says 0.5C, and I think
> that's the logging accuracy), and, well, humidity sensors are of dubious
> accuracy away from the middle of the range
>
> https://www.lascarelectronics.com/easylog-data-logger-el-usb-2-lcd/
>
>
>
>
>
>
>
> It's USB, talk-only, one reading a second, temperature, pressure, humidity
>> -- about as simple as you can get. Perfect for data logging along with
>> frequency standards, GPS, counters and such.
>>
>> But they don't make 'em anymore. My question is what similar
>> well-engineered, talk-only, serial or USB, temperature-pressure-humidity
>> sensors have you run across and could recommend? Not to be picky bit no
>> cheapo 1C or 0.5C sensors; 0.1C or better is ok.
>>
>> I know it's "easy" to throw one together with an Arduino, but I'm looking
>> for something pre-packaged, something that reliably works, out-of-the-box.
>> I have backup plans but hope someone on the list knows some products they
>> have used and would recommend.
>>
>> We could extend the discussion to voltage and power monitors too. Or some
>> kind of universal sensor TAPR project. But for now, let's just keep it to
>> simple air / environmental sensing.
>>
>> Thanks,
>> /tvb
>> ___
>> time-nuts mailing list -- time-nuts@febo.com
>> To unsubscribe, go to https://www.febo.com/cgi-bin/m
>> ailman/listinfo/time-nuts
>> and follow the instructions there.
>>
>>
> ___
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Re: [time-nuts] Temperature (environmental) sensors

[jimlux]

On 1/3/17 7:08 AM, Tom Van Baak wrote:

I have some high-end temperature and pressure instruments. But for casual use 
in my home and mobile timing lab I use Sparkfun Weather Stations. The old URL 
is:

https://www.sparkfun.com/products/retired/10586



Replaced by
https://www.sparkfun.com/products/12081
which doesn't have the USB.

By the time you add a board with a processor, you're in the $50 range..

I use these at work:

https://www.lascarelectronics.com/easylog-data-logger-el-usb-rt/
Well, actually I use the EL-USB-2-LCD.. which logs to internal memory 
and can't log/unload data at the same time and which requires a windows 
program.


That said, they work well, come with a traceable cal certificate, etc. 
I don't know that they do 0.1 degree (the data sheet says 0.5C, and I 
think that's the logging accuracy), and, well, humidity sensors are of 
dubious accuracy away from the middle of the range


https://www.lascarelectronics.com/easylog-data-logger-el-usb-2-lcd/







It's USB, talk-only, one reading a second, temperature, pressure, humidity -- 
about as simple as you can get. Perfect for data logging along with frequency 
standards, GPS, counters and such.

But they don't make 'em anymore. My question is what similar well-engineered, 
talk-only, serial or USB, temperature-pressure-humidity sensors have you run 
across and could recommend? Not to be picky bit no cheapo 1C or 0.5C sensors; 
0.1C or better is ok.

I know it's "easy" to throw one together with an Arduino, but I'm looking for 
something pre-packaged, something that reliably works, out-of-the-box. I have backup 
plans but hope someone on the list knows some products they have used and would recommend.

We could extend the discussion to voltage and power monitors too. Or some kind 
of universal sensor TAPR project. But for now, let's just keep it to simple air 
/ environmental sensing.

Thanks,
/tvb
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Re: [time-nuts] Temperature (environmental) sensors

[Adrian Godwin]

I haven't used this current generation of loggers (I do have a couple of
older RS232 units) but there's quite a range at

https://www.lascarelectronics.com/markets/environmental/


On Tue, Jan 3, 2017 at 3:08 PM, Tom Van Baak  wrote:

> I have some high-end temperature and pressure instruments. But for casual
> use in my home and mobile timing lab I use Sparkfun Weather Stations. The
> old URL is:
>
> https://www.sparkfun.com/products/retired/10586
>
> It's USB, talk-only, one reading a second, temperature, pressure, humidity
> -- about as simple as you can get. Perfect for data logging along with
> frequency standards, GPS, counters and such.
>
> But they don't make 'em anymore. My question is what similar
> well-engineered, talk-only, serial or USB, temperature-pressure-humidity
> sensors have you run across and could recommend? Not to be picky bit no
> cheapo 1C or 0.5C sensors; 0.1C or better is ok.
>
> I know it's "easy" to throw one together with an Arduino, but I'm looking
> for something pre-packaged, something that reliably works, out-of-the-box.
> I have backup plans but hope someone on the list knows some products they
> have used and would recommend.
>
> We could extend the discussion to voltage and power monitors too. Or some
> kind of universal sensor TAPR project. But for now, let's just keep it to
> simple air / environmental sensing.
>
> Thanks,
> /tvb
> ___
> time-nuts mailing list -- time-nuts@febo.com
> To unsubscribe, go to https://www.febo.com/cgi-bin/
> mailman/listinfo/time-nuts
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[time-nuts] Temperature (environmental) sensors

[Tom Van Baak]

I have some high-end temperature and pressure instruments. But for casual use 
in my home and mobile timing lab I use Sparkfun Weather Stations. The old URL 
is:

https://www.sparkfun.com/products/retired/10586

It's USB, talk-only, one reading a second, temperature, pressure, humidity -- 
about as simple as you can get. Perfect for data logging along with frequency 
standards, GPS, counters and such.

But they don't make 'em anymore. My question is what similar well-engineered, 
talk-only, serial or USB, temperature-pressure-humidity sensors have you run 
across and could recommend? Not to be picky bit no cheapo 1C or 0.5C sensors; 
0.1C or better is ok.

I know it's "easy" to throw one together with an Arduino, but I'm looking for 
something pre-packaged, something that reliably works, out-of-the-box. I have 
backup plans but hope someone on the list knows some products they have used 
and would recommend.

We could extend the discussion to voltage and power monitors too. Or some kind 
of universal sensor TAPR project. But for now, let's just keep it to simple air 
/ environmental sensing.

Thanks,
/tvb
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