[OpenTRV-dev] DS18B20 with Arduino

[Kevin Wood]

> its more to give Damon tips on how he could approach it.... i'm more the
> hardware guy that do the pcb's
>
> but yes tmp112 is a 2 wire.... sounds like a plan to me... ie not power up
> tmp112 and poll data oin that DS is connected to... should be fairly quick
> too

Yes. It would only have to be done once when a battery is inserted. After
that the AVR can remember its' config. Could even save it to EEPROM so it
never has to be done again, I suppose. Unless you only ever have a single
device on the OneWire bus, you need to do this anyway, to learn the
addresses of all connected devices.

I suppose I should acquaint myself with the current design. Been a bit out
of the loop recently.

>
> as a SMALL ps... you or anyone else knows where to get hands on solder
> dispensers ? will not mind a used one...

I'm afraid not.. I tend not to venture too far away from through-hole
devices. I don't need such steady hands then. ;-)

Kevin

> /bo
>
>
>
> -----Oprindelig meddelelse-----
> From: Kevin Wood
> Sent: Thursday, September 19, 2013 1:56 PM
> To: Closed list for developer discussions
> Subject: Re: [OpenTRV-dev] DS18B20 with Arduino
>
> Hi Bo,
>
> OK. Not that familiar with the tmp112 but I believe it has a 2 wire serial
> interface? If you set the clock pin inactive initially at power-up and
> polled the data pin using the dallas 1 wire protocol to see if any OneWire
> devices respond, then fall back to the tmp112 protocol if not, I guess
> that would probably work?
>
> Kevin
>
>
>> Hi
>>
>> Damon might not have mentioned or i have not seen that he has
>>
>> but we would like ideas on how to detect if we have a DS18B20 or TMP112
>> fitted
>>
>> the TMP is very low power and great res. but also a pain in the arse to
>> fit
>> even with manual pick and place..  thou i'm getting close... just need a
>> solder dispenser and i'm good for it
>>
>> /bo
>>
>> -----Oprindelig meddelelse-----
>> From: Kevin Wood
>> Sent: Thursday, September 19, 2013 1:26 PM
>> To: Closed list for developer discussions
>> Subject: Re: [OpenTRV-dev] DS18B20 with Arduino
>>
>> It seems that the code I used was derived from this:
>>
>> http://www.siwawi.arubi.uni-kl.de/avr_projects/tempsensor/
>>
>> There's no mention in the code or the web site of any license or
>> permission under which it may be used, unfortunately. At the time, that
>> didn't bother me, of course...
>>
>> It's not that complex, and I have onewire devices, so I could attempt to
>> "white room" myself and write something?
>>
>> Kevin
>>
>>> Thanks, that would be helpful!
>>>
>>> Rgds
>>>
>>> Damon
>>>
>>>
>>> On 18 Sep 2013, at 19:25, Kevin Wood wrote:
>>>
>>>> I've been using OneWire sensors with an AVR quite a bit. I'll have a
>>>> look at where the code I used came from. Can't remember if it was
>>>> home-made, pinched from somewhere or a combination thereof!
>>>>
>>>> Kevin
>>>>
>>>> On 18/09/13 18:09, Damon Hart-Davis wrote:
>>>>> Hi,
>>>>>
>>>>> Bo: following our earlier discussions
>>>>>
>>>>> With a little research I think it should be possible to make the V0.2
>>>>> work with DS (when running on 3.3V) or TMP, detected at run-time if
>>>>> need be, though there are a number of trickinesses, especially with
>>>>> timing because the DS is slow.
>>>>>
>>>>> But I have not yet found a sensibly-licensed 1-Wire library for
>>>>> Arduino/ATMega (ie *with* some sort of licence that isn't GPL and
>>>>> pref
>>>>> is BSD or Apache or MIT or similar), so might have to reverse
>>>>> engineer
>>>>> something.
>>>>>
>>>>> In any case it's not a trivial bit of work, but not insurmountable
>>>>> either.
>>>>>
>>>>> Rgds
>>>>>
>>>>> Damon
>>>>>
>>>>>
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