X-Authentication-Warning: delorie.com: mail set sender to geda-user-bounces using -f
X-Recipient: geda-user AT delorie DOT com
DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed;
        d=gmail.com; s=20120113;
        h=mime-version:in-reply-to:references:date:message-id:subject:from:to
         :content-type;
        bh=fLx5+RCuOoCGsy1c44VukOfivfo/3v9hFZcAT/NpFrA=;
        b=S6tl/S7wTEjnyxYnirFfD4OQYQEUBc9jVWn2jtxPrRPnDoxKGScQXDH1FhNlzWDFKu
         MsG7/CuPY6hGyTIUDovxMCcQl775S/+HFZPqvxHGy9fftGaN2nZcGDpQ8j+Ru0vfph17
         Wbsd3E0LMAGaFgdJ9C24SdWYpMRskdGK1W4zxzBgwnjmJTJQWUAU/sc1g0wEb7N314F7
         5voVkIis74XBJXw3MVRbJbCq3Bcf3MQQgcW2TO8wvLEiCbCmeJK6g/YDh3DOGrEeDv+B
         0JKZ3k889yl2QeZVp1UGY+Rq0PW+YZAcvADqFlAMRHRGoayAtiJVf6Vqw6htHBsRBq0J
         NFgw==
MIME-Version: 1.0
X-Received: by 10.112.37.198 with SMTP id a6mr13282667lbk.86.1425653726596;
 Fri, 06 Mar 2015 06:55:26 -0800 (PST)
In-Reply-To: <CAF3uCZnSwMfNTVybJ+U89RTOk5=B+5FSSci1tD2nW9Ywo9Armg@mail.gmail.com>
References: <CAF3uCZ=G0FztqBtpfvssYCz9WrUORX8+J45xmH9+KutaX6c+gw AT mail DOT gmail DOT com>
	<201503051621 DOT t25GL09H018380 AT envy DOT delorie DOT com>
	<CAF3uCZnSwMfNTVybJ+U89RTOk5=B+5FSSci1tD2nW9Ywo9Armg AT mail DOT gmail DOT com>
Date: Fri, 6 Mar 2015 09:55:26 -0500
Message-ID: <CAM2RGhS_=rQL1UyMg8xixfOsrXq=AhZ__S70ijhSi=pLg=ZjQQ@mail.gmail.com>
Subject: Re: [geda-user] [OT] Temperature sensor and control recommendation
From: Evan Foss <evanfoss AT gmail DOT com>
To: geda-user AT delorie DOT com
Content-Type: text/plain; charset=UTF-8
Reply-To: geda-user AT delorie DOT com
Errors-To: nobody AT delorie DOT com
X-Mailing-List: geda-user AT delorie DOT com
X-Unsubscribes-To: listserv AT delorie DOT com
Precedence: bulk

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



-- 
Home
http://evanfoss.googlepages.com/
Work
http://forge.abcd.harvard.edu/gf/project/epl_engineering/wiki/