Overview
Some Fly-E3-Pro-v3 boards have support for PT100 and type ‘K’ thermocouples.
If your board has the chip shown below in red, you have PT100 support.
If your board has the chip shown below in red, you have ‘K’ type thermocouple support.
Board.txt modifications
The following lines should be added to the board.txt file.
SPI3.pins = { PD_14, PD_12, PD_13 }
heat.spiTempSensorChannel = 3
heat.spiTempSensorCSPins = { PD_15, PC_7 }
Config.g changes
PT100
A 2 wire PT100 can be converted to a 3 wire PT100. Ideally, all wires going to the PT100 should be of the same type and length to ensure they’re all the same resistance. Cut the wires of the PT100 close (around 50 - 100mm) to the sensor. Then attach 1 wire to 1 wire of the sensor and attach the other 2 wires to the other wire of the sensor.
Connect the two wires to connectors 1 and 2 and connect the single wire to connector 3.
To use the PT100 on your hotend, use the following code in config.g If you are in a country where the mains frequency is 50Hz, change the F60 to F50 (if you don’t know, look here)
M308 S1 P"PD_15" Y"rtd-max31865" F60 R430 W3
Type ‘K’ Thermocouple
To use the Type ‘K’ Thermocouple on your hotend, use the following code in config.g
M308 S1 P"PC_7" Y"thermocouple-max31855"