ExtThermoCouple 1.0

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External Thermocouple board

Release status: Working

Description External Thermocouple board
License GPL
Author brupje
Based-on Pololu Electronics
Categories Megatronics, Electronics
CAD Models none
External Link none



If you need a third extruder on megatronics with thermocouple reading, or want improved temperature readings on RAMPS, you can use this board. It connects to any analog pin on the electronics and is supported by Marlin firmware.

Major features

  1. Compatible with RAMPS 1.4, Megatronics 1.0 and 2.0
  2. Easy to connect


RepRap thermocouple AD597 adapter schematic.jpg

Hooking up to Megatronics

Locate the Serial pins on the board (just below the stepper driver slots). Match the red wire with +, the black with - and the yellow with signal.


Hooking up to RAMPS

Locate the A-Out pins on the board in the aux-1 section. Match the red wire with +, the black with - and the yellow with signal.


Settings in Marlin

In configuration.h, select -1 as temperature sensor. For example:

#define TEMP_SENSOR_0 -1

In pins.h adjust the temp pin for you electronics to the analog pin (on both RAMPS and Megatronics pin 3, if connected through the examples above). For example:

#define TEMP_0_PIN 3

Be sure that you edit the TEMP_0_PIN from the motherboard you use. if you use the ramps motherboard, you have to edit TEMP_0_PIN on line 372 in the pins.h if you have another motherboard you have to know the number in the marlin software, and seek for if MOTHERBOARD == "your number of motherboard" (you will find this for the first time on line 16 and the next statement is on line 62).

After uploading the firmware, you should have themocouple readings now.


DesignSpark sources: File:Extthermoucouplesrc.zip