Adafruit Max31865 PT100 board help

Projects General Guidance
1

Hi All,

I have got an Adafruit PT100 board but want to use it along with a pt1000

Do I just need to change Rref from the 430 ohm to 4.02K on the board

Then in the code does RREF need to be changed from 430 to 4002?

I have just been reading the information from the adafruit website as below

Thanks

2

I'm guessing you meant 4.3k, not 4.02k. Any resistance near 4k should work. If you measure the resistor before you put it in you can get a value as accurate as your multimeter can supply.

You will need to set the value of RREF to match your resistor to get the right resistance readings. If you call their conversion function you will have to change the 100 to 1000 as well as setting RREF to 4300:

max.temperature(1000, RREF)