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Date:	Fri, 6 Mar 2015 09:55:26 -0500
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Subject:	Re: [geda-user] [OT] Temperature sensor and control recommendation
From:	Evan Foss <evanfoss AT gmail DOT com>
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Why is everyone assuming this should be done digitally? I can imagine
wanting to read the value out in that domain for data logging but the
control loop could be analog. I think Anders Wallen did something like
this a while back for his optical tweezers.

On Fri, Mar 6, 2015 at 9:39 AM, Adrian Pardini <pardo DOT bsso AT gmail DOT com> wrote:
> On 5 March 2015 at 13:21, DJ Delorie <dj AT delorie DOT com> wrote:
>> I use a thermocouple to monitor my woodstove, but I don't care so much
>> about precision.  I use a DS2760 thermocouple kit from Parallax for
>> it, and a high-temp thermocouple probe from Omega.com.
>>
>> For monitoring my geothermal system, I used RTDs and an MCU's ADC to
>> measure them.  I got extra precision by doing each measurement 64
>> times and averaging, and the tech who calibrated my geothermal system
>> says they're spot-on.
>>
>> I use the same averaging trick on my thermostats to get 0.1F readings
>> on a 1C-rated sensor.  If your sensor isn't noisy enough to use this
>> trick, you can always add noise - you're basically building a 1-bit
>> ADC.
>
> Thanks, I have already looked at Omega as a sensor provider. I didn't
> know about that ic but found the max1403 and max11200, still I'm a bit
> wary because I haven't got many successfully experiences trying to buy
> or get samples from Maxim.
>
> That trick is quite nice and saved my day a couple of times.
>
>
>
>
> --
> Adrian.
> http://ovejafm.com
> http://elesquinazotango.com.ar
> http://www.elarteylatecnologia.com.ar



-- 
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