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By lucasromeiro
#78830 I need to use a PT100 to read an ultra low temperature. -180C.
I found PT100 to get this. But I need to develop a way to read pt100 in Esp 12F, using the Arduino compiler.
I already seen that there are some temperature transmitters that convert and deliver me from 4 to 20 ma. But I need to develop mine.
any tips?
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By lucasromeiro
#78892
rudy wrote:Have you looked at the MAX31865?
https://datasheets.maximintegrated.com/ ... X31865.pdf
https://www.adafruit.com/product/3328

https://learn.adafruit.com/adafruit-max ... duino-code


great!
I had never seen an IC with this function.
Shame it's SPI occupy more pins in esp.
do I find an I2C version?
Do you know other options?
Thank you Rudy!

For thermocouple reading, you use what?

Thanks!!!!!
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By rudy
#78897 I have not used the MAX31865.

Mostly I have used J or K thermocouples with a different Maxim chips, never RTD. Also SPI interface. One application I needed eight thermocouples so I used a 3-8 decoder to give me more chip enables.

I have never needed to measure very cold temperatures, only high.