Project:Sanguinololu Thermocouple

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[[|Sanguinololu Thermocouple]]
Created 03/11/2012
Version 1
Members Pinski1
Project Status Awaiting PCBs
QR code


I wanted to add a thermocouple to my 3D printer's hot end. Ideally it would improve the quality of my printed objects as it would provide more accurate temperature readings with greater immunity from electronic noise generated by the stepper motors.


The PCB I have designed has the following features:

  • Fits onto the expansion headers already present on the Sanguinololu
  • Adds a MAX31855 thermocouple to digital convertor chip
  • Enables temperature readings between -200°C to +1350°C ±2°C
  • Has a resolution of 0.25°C
  • Can sample at 10Hz



Sanguinololu Thermocouple Schematic.png

Eagle 5.11 file:

PCB Layout

Sanguinololu Thermocouple Layout.png

Eagle 5.11 file:


Qty Value Ident Description
1 TXB0104D IC1 SOIC14 Bi-Directional level translator chip
1 TPS73033DBVT IC2 Could be any SOT23-5 +3V3 voltage regulator
1 MAX31855K IC3 SOIC8 Thermocouple-to-Digital chip
2 2.2uF C1, C2 Ceramic 1206 decoupling capacitors
3 10nF C3, C4, C5 Ceramic 0805 decoupling capacitors
1 SV1 2x5 way, straight, 2.54mm, female header
1 X1 2way, screw terminal, 5.08mm


Top Bottom
The Eagle CAD layout.
Sanguinololu PCB Render.png The Eagle CAD 3D render
Sanguinololu PCB top.png Sanguinololu PCB bottom.png The PCB renders of OSH Park
To come To come The delivered PCBs.

How to Build


This design is licensed under Creative Commons BY-NC-SA

This design is modified from Sanguinololu SD