M31855k and PT100

[c310]

Hello! Is it possible to configure DuetWiFi with M31855k + PT100?
RRF3.4

direct PT100 reading is about 109 ohm (23' С seems to be correct)

With this daughterboard i have connected 100 Ohm resistor. it reads 30'C, that is completely wrong..

Configuration is

```

M308 S1 P"spi.cs1" Y"thermocouple-max31855" 
M950 H1 C"e0_heat" T1		

So, questions

1. is M31855k compatible with PT-100?
2. if yes, what should i change in config to make it working ?

Many thanks

[dc42]

@c310 the MAX31855 chip is for interfacing to thermocouples only. It cannot interface to PT100 or PT1000 sensors.

For PT100 sensors we make a similar daughter board that uses the MAX31865 chip.