[OpenTRV-dev] DS18B20 with Arduino

[Bo Herrmannsen]

Hi

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


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

/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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