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Highly Precise Temp Sensor
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Highly Precise Temp Sensor

by tampa_poet on Tue Sep 18, 2012 12:16 am

I'm trying to find a highly precise temp sensor. I've tried the following:

tmp36
tmp38
DHT11
DTH12
AM2302
10K Precision Expoxy Thermistor

I put all of them on one test platform and none of them give me the same readings:

Comparison Readings:
--------------------------
80.4 - Radio Shack Digital Thermometer
79.3 - Radio Shack Digital Thermometer 2
80.0 - Analog Indoor Mechanical Thermometer
80.0 - CT30 Thermostat from Radio Thermometer

Device Readings from each of the sensors:
--------------------------------------------------
69.5 - TMP36
73.0 - TMP38
75.2 - DHT11
81.9 - DHT22 #1
81.7 - DHT22 #2
78.8 - 10K Thermistor #1
79.3 - 10K Thermistor #2

I'm building my own thermostat and would like something that responds to temp changes quickly and is precise down to .5 degrees F.

Any suggestions?

Thanks!
tampa_poet
 
Posts: 12
Joined: Sat Feb 11, 2012 8:17 pm

Re: Highly Precise Temp Sensor

by adafruit_support_bill on Tue Sep 18, 2012 7:01 am

I put all of them on one test platform and none of them give me the same readings:

There is a difference between precision and accuracy. In spite of what the manufacturers may say, all temperature sensors need to be calibrated. The real question is how precise, stable and repeatable are the readings once they are calibrated.

A thermistor should do the job for you.

adafruit_support_bill
 
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Joined: Sat Feb 07, 2009 10:11 am

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