The emulated serial requires changing baud rates for each 1-wire
communication, and using a serial byte to send each 1-wire bit. Since most
computer UARTs have a pretty small buffer, the CPU does a lot of work
waiting for the serial data.
A microprocessor is great for low-level bit-banging, but sending each
serial command over the network will be slow. That's why I thought a more
efficient serial protocol would be advantageous. You could design one, and
we'll support it, but the chips (Link and HA7E) are about $21. Seems like
your time is worth something, especially since the power and timing and
pulse contouring and echo suppression will be better.
On Tue, Jan 28, 2014 at 3:41 PM, Colin Reese <colin.re...@gmail.com> wrote:
> Sorry, reading your last sentence, you did address this. Why would you not
> recommend trying this? Error-prone?
>
>
> On Tue, Jan 28, 2014 at 12:12 PM, Paul Alfille <paul.alfi...@gmail.com>wrote:
>
>> I take it your microprocessor doesn't run linux. In that case, you want
>> it to look like a serial bus master.
>>
>> There are 3 serial bus masters that I can remember off hand: the DS9097U,
>> the Link and the HA5. The later 2 use a much simplified serial data stream
>> (simple ascii), and I think are both available in chip format for fairly
>> cheap. The radio part would be transparent.
>>
>> http://www.ibuttonlink.com/products/linkoem
>>
>> http://www.embeddeddatasystems.com/HA7S--ASCII-TTL-1-Wire-Host-Adapter-SIP_p_23.html
>>
>> (I should add that the serial port can synthesize a bus master -- the
>> passive adapter) but I wouldn't recommend that remotely. Code for DS9097U
>> emulation is available -- Maxim never considered restricting masters, only
>> slaves).
>>
>> Paul Alfille
>>
>>
>>
>> On Mon, Jan 27, 2014 at 4:33 PM, Colin Reese <colin.re...@gmail.com>wrote:
>>
>>> It will look like:
>>>
>>> 1Wire network (DS18B20, DS2408, etc) -- uC (ATTiny, ATmega) GPIO,
>>> OneWire, DallasTemperature, SoftwareSerial libraries -- XBee/Zigbee send --
>>> XBee/Zigbee receive -- RPi
>>>
>>> At the moment the serial output from the uC is just code I write that
>>> says 'hey, here the temperature is'. If I can process it into a owserver
>>> friendly format at either end, that would be great. Otherwise, I'll just
>>> have to process it into a database using pyserial. Not a big deal, but not
>>> as elegant as owfs and owserver.
>>>
>>> I'd happily put a DS2483 at the 1wire end if I thought it would get me
>>> anywhere, but I can't see that it will.
>>>
>>>
>>> On Mon, Jan 27, 2014 at 1:20 PM, Roberto Spadim
>>> <robe...@spadim.com.br>wrote:
>>>
>>>> ? i don't understand....
>>>> check:
>>>>
>>>>
>>>> ethernet (wifi ethernet, ethernet)
>>>> wireless (wifi ethernet, bluetooth, zb)
>>>> serial (rs232,rs485,rs422)
>>>> ow - serial-ow converters (ds2480b), microcontroler bus (on/off gpio),
>>>> i2c-ow converters (ds2482)
>>>>
>>>> what part you need?
>>>>
>>>>
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>>
>>
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