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accuracy in measuring temperature

Posted: Sat May 21, 2016 3:57 pm
by LLYY
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!

Re: accuracy in measuring temperature

Posted: Sun May 22, 2016 1:49 am
by masa-aud
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

Re: accuracy in measuring temperature

Posted: Sun May 22, 2016 2:36 am
by masa-aud
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

Re: accuracy in measuring temperature

Posted: Sun May 22, 2016 3:11 am
by Gavinmc42
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.