LLYY
Posts: 2
Joined: Mon May 16, 2016 12:07 pm

accuracy in measuring temperature

Sat May 21, 2016 3:57 pm

Hello,
I'm searching for a temperature sensor with 0.1C accuracy, the best that I found so far is the DS18B20 model.
Are there other temperature sensors that hiding somewhere?

Thank You!

masa-aud
Posts: 144
Joined: Fri Feb 26, 2016 9:20 am

Re: accuracy in measuring temperature

Sun May 22, 2016 1:49 am

reply to LLYY on accuracy in measuring temp
It is important to refer accuracy of mostly used AD converters for RPi or Arduino as at most about 1/4000 that is 12bit type, seems to fit practically to that 0.1 C.
masa

masa-aud
Posts: 144
Joined: Fri Feb 26, 2016 9:20 am

Re: accuracy in measuring temperature

Sun May 22, 2016 2:36 am

reply to LLYY on accuracy in measuring temp
From connection to GPIO of RPi point of view, recommended type of device is such having digital interface as I2C or SPI, that sensor output already converted with built-in ADC then to digital but not so fine as your referring sample DS18B20 as +- 0.5C.
If you plan a kind of 0.1C then some precision amplifier circuits needed added to sensor and ADC.
I think it's good to try first a DS18B20 then to your next system.
masa

User avatar
Gavinmc42
Posts: 3415
Joined: Wed Aug 28, 2013 3:31 am

Re: accuracy in measuring temperature

Sun May 22, 2016 3:11 am

I use i2c sensors, multiple addresses so you can have a string of them.
TMP112, TMP175 - 0.0625C resolution.
TMP112 can be calibrated for even more accuracy.
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