Mesa 7i76e and pt100 temp sensor

Look on eBay / Amazon / Adafruit / Aliexpress for one of the MAX31865 boards. They are used in some 3D printers and are pretty cheap.

You could set up a Wheatsone bridge for 0.4V output at 100C from a 5V supply. (Using the PT100 and 3 x 100Ω resistors)
www.allaboutcircuits.com/tools/wheatstone-bridge-calculator/

Running the bridge at 24V gives more output, but at the risk of damaging the input if the wiring goes wrong. Also that's about 5W of power dissipated in the resistors/PT100 too so there might be self-heating.

Do you mean MAX31855?
Does the MAX31855 lib also support the MAX31865?

The 31855 is for thermocouples.

I imagine that the module could be re-configured for the 31865.

The 31855 is for thermocouples.

I imagine that the module could be re-configured for the 31865.

Look on eBay / Amazon / Adafruit / Aliexpress for one of the MAX31865 boards. They are used in some 3D printers and are pretty cheap.

So I will try to find one and first just to connect it directly and see what comes back
Thx