Wow I thought my offset/jitter specs were good!
Yours are outstanding.
I am using a HP thinclient (T150) with a 60Gb laptop drive shoehorned into it,
just 10W to power it ;)
remote refid st t when poll reach delay offset jitter
Hi
The turn point temperature on the crystal is only a starting point. In a
circuit like you have, the actual operating temperature is adjusted to
compensate for the temperature coefficient of the rest of the circuit. WIth a
heated crystal OCXO, that can be a 10C offset. The temperature you
I've decided I finally want to tackle learning how to use a PIC chip for some
smaller projects. Can someone recommend me a good (and
cheap) PIC, and possible some literature (be it a book or website)? I have a
fairly recent willem eprom programmer that I'm hoping I
can use.
I don't know what
Why not TimeLab?
On Sat, May 25, 2013 at 4:41 AM, Stan, W1LE stanw...@verizon.net wrote:
Hello The Net:
Can anyone point me to a source for the subject software ?
Thanks Stan, W1LE Cape Cod
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Hi
PIC's have been around for a *long* time. The PIC16's came early on and were
followed by the PIC18's. Both are a bit dated at this point. The PIC24's and
dsPIC33's are actually very similar parts. The PIC33's form a third family
pretty much on their own. A modern version of the Microchip
I started with just the PIC datasheet to learn about the hardware
architecture and the MPASM to write (in assembler) the first try at a
PIC16C84 (at that time the PIC16F84 was not yet available). There are
plenty of sites about PICs and relative projects. The Shera controller
is based on PICs.
On
Hi
I started out with the PIC16's as well, I did projects using a number of them,
and moved to the PIC18's long ago. If you were starting out today - which
family would you start with?
Bob
On May 25, 2013, at 10:03 AM, Azelio Boriani azelio.bori...@screen.it wrote:
I started with just the
On 5/25/13 7:22 AM, Bob Camp wrote:
Hi
PIC's have been around for a *long* time. The PIC16's came early on and were
followed by the PIC18's. Both are a bit dated at this point. The PIC24's and
dsPIC33's are actually very similar parts. The PIC33's form a third family
pretty much on their
Timelab works nicely with my Fluke PM6690, either with Prologix GPIB-USB
adapter or straight USB.
Jerry
K1JOS
-Original Message-
From: Azelio Boriani [mailto:azelio.bori...@screen.it]
Sent: Saturday, May 25, 2013 08:14
To: Discussion of precise time and frequency measurement
Subject:
On Sat, May 25, 2013 at 2:43 AM, David J Taylor wrote:
Paul,
Just what devices were you hot-plugging to produce this problem? One with
an initial current surge outside the USB spec I could understand.
I was plugging in a USB to RS232 adapter. If you read the various bits
you'll find
Hello A.B.,
Actually TimeLab is collecting data right now and I am quite happy
with it.
I will be even happier when the PM6680B arrives on Tuesday and TimeLab
can drive it directly without the talk only function I am currently using.
The FLUKE TimeView is only an alternative, whose
Flightradar24 is using beagle bones in their ADS-B/mode-s system and will be
incorporating MLAT soon. I suspect they work well in timing applications.
That said, the Allwinner they sell on Sparkfun will probably be my next SBC.
Though not listed on the wiki, they have opensuse running on it.
On Sat, May 25, 2013 at 05:06:57PM +, li...@lazygranch.com wrote:
Flightradar24 is using beagle bones in their ADS-B/mode-s
system and will be incorporating MLAT soon. I suspect they work
well in timing applications.
That said, the Allwinner they sell on Sparkfun will probably be
my next
Try replacing the gigabit switch with a 100BaseT switch. Interrupt
coalescence is sometimes used in gigabit interfaces. It's like the
buffering problem I think they do this because with the 10X faster
network the computer just can't handle an interrupt per packet.You
have to try it because
How did you decide to use a PIC and not one of the others such as the
AVR MSP or whatever? I don't want to argue for any of the others but
if you can't list 5 or 6 good reasons to use a PIC and you are not
able to say why the oters cn't work for you then you've just selected
something at random
My reasoning for using a PIC (or similar) is mostly two factors.
First, simplicity... The few things I have in my head that I've wanted to do
aren't complicated or require special busses. It is
things that you could *probably* do with a whole pile of logic chips, or keep
it simple with just one
Can anyone point me to a source for the subject software ?
Stan,
The source code is not available as far as I know. The binary is shipped if you
order that option with your counter from Fluke or Pendulum. It's key'ed so it
can't be shared or re-sold. It's a reasonable tool, works with native
I have an older Endrun Technologies Praecis Gntp (GPS) time server. Basically
it's a small SBC coupled together with a special board
made by Endrun (I think really it's just their Praecis Ce Time Frequency
Engine) and a Trimble GPS module.
It ran fine for years, then one day it stopped
Questions have come up on the recent release of the Shera code. All
software commands with the exception of Auto N get lost in case of power
failure.
Auto N is stored in EEPROM. After power fail Dip switches take over. Alpha
filter can be activated with software commands or switch #5. #5
On another thread, Bob wrote:
If the objective is to complete a very simple, low powered project
and be done with it, go with the Arduino. If the objective is to
learn an empire, be very careful about which empire you pick. The
ARM boys are quickly gobbling up a lot of territory that once was
If you have enough software development experience then maybe you
don't need the Arduino. It is best if you have none. And as you say,
you need to spend $30 per project.
But you might still consider some kind of flash based chip. These can
download new revisions of your software nearly
Hi
If you are going to code on a cheap PIC (the PIC16 series) you will likely need
to learn PIC assembler. All my coding on those parts was in assembly language.
They are old enough / slow enough / small RAM enough that things like C (or the
other high level languages you listed) really don't
Thank you for these additional informations, Bert !
regards
Arnold
Am 25.05.2013 21:58, schrieb ewkeh...@aol.com:
Questions have come up on the recent release of the Shera code. All
software commands with the exception of Auto N get lost in case of power
failure.
Auto N is stored in
Hi
As I've mentioned before, the ARM parts are getting to be pretty pervasive. The
toolchains are quite good. The peripherals are extensive and they seem to work
well. I have a preference for the Freescale versions, but there are a *lot* of
people out there making them. They similarities
On 5/25/13 10:55 AM, Chris Albertson wrote:
3) the Pi is almost PC-like and very easy to use. Costs about $40
and requires a HDMI or DVI monitor..
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*Jim Lux*
S*at May 25 16:53:50 EDT 2013*
* 3) the Pi is almost PC-like and very easy to use. Costs about $40***and
requires a HDMI or DVI monitor..
A $9 USB to 3.3V serial adapter connects to
the serial console unless you prefer ssh or VNC.
Likewise the Beaglebone.
Le 25 mai 2013 à 22:53, Jim Lux a écrit :
On 5/25/13 10:55 AM, Chris Albertson wrote:
3) the Pi is almost PC-like and very easy to use. Costs about $40
and requires a HDMI or DVI monitor..
If you don't need graphics it runs fine headless using putty to ssh into.
For the original Arduino Uno the $30 cost may be true, but there are lots of
other options in the Arduino family. The Pro Mini
(https://www.sparkfun.com/products/3) is only $10, being that it uses an
external serial to USB adapter (such as
the https://www.sparkfun.com/products/9718). The
3) the Pi is almost PC-like and very easy to use. Costs about $40
and requires a HDMI or DVI monitor..
It's got an ethernet. You can ssh in to it from your PC. Headless is the
buzzword.
It may be easier to get started if you plug in a display and keyboard.
Even with graphics it works fine (I think it works better) headless using X or
VNC
Sent from my iPhone
On May 25, 2013, at 17:05, mike cook mc235...@gmail.com wrote:
Le 25 mai 2013 à 22:53, Jim Lux a écrit :
On 5/25/13 10:55 AM, Chris Albertson wrote:
3) the Pi is almost PC-like
On Sat, 25 May 2013 16:09:11 -0400
Charles P. Steinmetz charles_steinm...@lavabit.com wrote:
On another thread, Bob wrote:
If the objective is to complete a very simple, low powered project
and be done with it, go with the Arduino. If the objective is to
learn an empire, be very careful
On Sat, 25 May 2013 23:42:19 +0200
Attila Kinali att...@kinali.ch wrote:
Last but not least: There is an advantage in using more popular
chips (AVR, Arm Cortex-M). You will find more knowhow and help on the
net for the toolchain or other problems. You will find more ready made
libraries and
On 5/25/2013 12:43 AM, Mark C. Stephens wrote:
Hey Ed, Just knocked up a temperature sensor with a Dallas single wire
temperature sensor thingy, a pic and an LCD display.
So, I will know for sure I am hitting the xtal turning point.
I figured you had been right about everything so perhaps my
I agree with everything below. It is a good argument for AVR. The
AVR was designed specifically wit the needs of the compliter writer in
mind. Because of this C compilers can generate very good AVR code and
there is rarely a good reason to program an AVR in assembly, although
you can.
The
On 5/25/2013 1:22 PM, Bob Camp wrote:
If you are going to code on a cheap PIC (the PIC16 series) you will likely need
to learn PIC assembler. All my coding on those parts was in assembly language.
They are old enough / slow enough / small RAM enough that things like C (or the
other high level
On 25 May 2013, at 15:22, Bob Camp wrote:
If you are going to code on a cheap PIC (the PIC16 series) you will likely
need to learn PIC assembler. All my coding on those parts was in assembly
language. They are old enough / slow enough / small RAM enough that things
like C (or the other
charles_steinm...@lavabit.com said:
My question here is more pointed: If one is going to learn a new system
today for timing and other measurement/control projects, which empire is
likely the best one to choose?
I'd split things into 3 piles.
PIC, AVR and friends are really small. Scan
On 5/25/2013 3:40 PM, Bob Camp wrote:
You can get a part with 1MB of flash, 128KB of ram, 6 UARTS, 4 16 bit A/D's,
10/100 Ethernet, USB, and a bunch of other stuff for less than $10. Drop this
and that, go to half the flash, and yup, the price is 1/2. Comes with a free
toolchain and two
In general PICs need assembly language for many things. AVRs almost
never need assembly. The reason is that the AVR designers studied C
compilers and made the AVR an easy compiler target.
A compiler writer like to have an orthogonal instruction set and
some other features. So the AVR compirrs
About using w32tm /stripchart and the µs resolution :
Despite RFC 1305 compliant, Microsoft w32tm is still bound to the clock
interrupt frequency fed to the processor :
http://serverfault.com/questions/488983/is-it-viable-to-use-w32tm-stripchart-to-judge-time-variance-of-two-windows-host
So if you
Hi
At least on the code I've tried both ways, there's about a 2:1 difference in
what you can get done on a low end PIC with assembly vs C. There are a lot of
things you can get away with in assembler that drive a C compiler a bit nuts….
Bob
On May 25, 2013, at 5:24 PM, Rex r...@sonic.net
Hi
It always depends on what you are trying to do and what you are happy with as a
result. Back when packing lots of stuff into a PIC mattered, the only way I
could get it done (literally millions of lines of code spread across many
dozens of projects) was with assembler. The C compilers that
If you go arm cortex and linux, you will need to make your code a service.
You will want it to start up by itself and if for some reason it crashes, you
will want it to restart itself. The buzzword is harden and the techniques
vary depending on the distribution.
You should check the
On 5/25/13 2:10 PM, Paul wrote:
*Jim Lux*
S*at May 25 16:53:50 EDT 2013*
* 3) the Pi is almost PC-like and very easy to use. Costs about $40***and
requires a HDMI or DVI monitor..
A $9 USB to 3.3V serial adapter connects to
the serial console unless you prefer ssh or VNC.
Once you have
Hi
If you want Linux, you probably also want something like an A9 or better. The
M0 and even the M4's MCU's are not really targeted at Linux. Can you pack it
into a big M4 - sure, it'll be a tight fit and you may not have everything you
really wanted to have. Oddly enough some of the M4's have
Hi
It's one of the Freescale K60's they have them in several speeds and packages.
Others have similar parts.
http://www.freescale.com/webapp/sps/site/prod_summary.jsp?code=K60_120nodeId=01624698C9DE2DDDAFtab=Buy_Parametric_TabfromSearch=false
hopefully shows the family information
The first
Hi
I just realized the buy direct button on that page requires a login. The
single piece direct price is $9.70. First price break is at 25 pieces (to
$8.95).
Bob
On May 25, 2013, at 8:56 PM, Bob Camp li...@rtty.us wrote:
Hi
It's one of the Freescale K60's they have them in several speeds
I suspect Linux based systems are a few sigma away from the original goal of a
cheap pic choice...:)
But to get back to the original point, you can get samples of most of the PIC
chips from MicroChip for free. I think the limit is 3 per week. Or 30 days, I
don't remember.
Bob
On May 25,
On Sat, May 25, 2013 at 04:03:36PM -0700, Chris Albertson wrote:
In general PICs need assembly language for many things.
AVRs almost never need assembly.
I've done quite a number of PIC projects, from low end
8 bit up to the high end 32 bit controllers, and except
for a really time critical
Hi
I realize this is a bit like water torture - sorry about that.
If I go to Microchip Direct and ask for a PIC 18F with two UARTS and two A/D's
I get the PIC18F86J72 and PIC 18F87J72. To me the second one is the obvious
winner. It's got twice the flash for next to nothing more money. 1-25
On Sat May 25 20:18:20 EDT 2013
A $9 USB to 3.3V serial adapter connects to
the serial console unless you prefer ssh or VNC.
Once you have it up and running, sure...
Or maybe, someone has a SD image that you can just dump onto an SD
The Pi, unlike the the Beaglebone Black (BBB) doesn't come
Hi
To *maybe* bring this back to a bit more timing related region of internet
space:
To make any of these parts really do timing stuff (as opposed to simply
display strings) you need some glue. A CPLD or better yet an FPGA can give you
a *lot* of glue for the money. A board with a Cyclone V
On Sat, May 25, 2013 at 08:46:03AM -0500, Jason Rabel wrote:
I've decided I finally want to tackle learning how to use a PIC
chip for some smaller projects. Can someone recommend me a good
(and cheap) PIC, and possible some literature (be it a book or
website)? I have a fairly recent willem
While I have often said that I have more time than money, I still consider that
my time is too scarce (or valuable) for assembly language.
My opinion is that the language for small embedded devices is C. Some may
disagree, but after over 40 years of writing software for a whole bunch of
The Pi has virtually no IOs, not good for any embedded system.
The BeagleBone Black on the other hand has plentt of IOs
Didier
Jim Lux jim...@earthlink.net wrote:
On 5/25/13 10:55 AM, Chris Albertson wrote:
3) the Pi is almost PC-like and very easy to use. Costs about $40
and requires a
Hi
I have had several conversations with 16 bit chip designers over the past
couple of years. Each time the M0 or similar ARM parts has come up. The
consensus seems to be that getting (internal) funding for future 16 bit parts
is going to be tough. The tiny 8 bit parts will survive and move
Hi
If you are putting money into a Microchip programmer, I'd probably head over to
the PIC Kit 3 rather than the 2. It will do debug as well as programming on the
range of parts. Having breakpoints and debug is a *good* thing.
Bob
On May 25, 2013, at 9:44 PM, Herbert Poetzl
Having used PICs since 1990, I've designed them into projects rather
than getting a board like a Parallax or Arduino (either of which are far
more expensive than the chip and the few components required to make it
work) and then shoehorning someone else's board into my project.
Since the late
On Sat, May 25, 2013 at 10:04:59PM -0400, Bob Camp wrote:
Hi
If you are putting money into a Microchip programmer, I'd
probably head over to the PIC Kit 3 rather than the 2. It will
do debug as well as programming on the range of parts.
Unfortunately the command line support is missing in
On Sat, May 25, 2013 at 6:39 PM, Didier Juges shali...@gmail.com wrote:
My opinion is that the language for small embedded devices is C. Some may
disagree, but after over 40 years of writing software for a whole bunch of
platforms (obviously not all in C), I see no reason to switch to
On Sat, May 25, 2013 at 6:39 PM, Didier Juges shali...@gmail.com wrote:
While I have often said that I have more time than money, I still consider
that my time is too scarce (or valuable) for assembly language.
My opinion is that the language for small embedded devices is C. Some may
On Sat, May 25, 2013 at 09:26:02PM -0400, Bob Camp wrote:
Hi
I realize this is a bit like water torture - sorry about that.
If I go to Microchip Direct and ask for a PIC 18F with two
UARTS and two A/D's I get the PIC18F86J72 and PIC 18F87J72.
To me the second one is the obvious winner. It's
Nice topic. I learned at bit. One source of info on the PIC is a course book
and
programming kit, programmer, prototype board and components set up by the ARRL.
www.arrl.org
You get all the stuff you need to get going. Software and a integrated
development environment is provided. All in one
I'm surprised not to have seen the picaxe(s) mentioned. cheap enough,
easily programmed, large amount of re-useable code chunks, etc. Not for
production, but good enough for a few-off or individual projects,
cheaper than Arduinos...
Of course, I like New Micros. expensive (relatively) but directly
The Pi has virtually no IOs, not good for any embedded system.
The BeagleBone Black on the other hand has plentt of IOs
Didier
You can see the RPi I/O connections here:
http://elinux.org/RPi_Low-level_peripherals#General_Purpose_Input.2FOutput_.28GPIO.29
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