How to connect a PT100 or Type 'K' Thermocouple to a Fly-E3-Pro-v3

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.

Fly-E3-Pro-v3 PT100 Chip
Fly-E3-Pro-v3 PT100 Chip

If your board has the chip shown below in red, you have ‘K’ type thermocouple support.

Fly-E3-Pro-v3 K Chip
Fly-E3-Pro-v3 'K' Thermocouple Chip

Board.txt modifications

The following lines should be added to the board.txt file.

SPI3.pins = { D.14, D.12, D.13 }
heat.spiTempSensorChannel = 3
heat.spiTempSensorCSPins = { D.15, C.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.

3 Wire PT100
3 wire PT100

Connect the two wires to connectors 1 and 2 and connect the single wire to connector 3.

Fly-E3-Pro-v3 Connection
Fly-E3-Pro-v3 PT100 Connection

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"PD15" 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"C7" Y"thermocouple-max31855"
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