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Small green circuit board with thermocouple terminal block and pin headers

Adafruit

Adafruit MAX31856 Universal Thermocouple Amplifier Breakout

SKU CH-21F1-08EG5

Breakout board amplifies any K, J, N, R, S, T, E, or B thermocouple with 0.0078125° resolution over SPI using four digital pins

  • TypeEngineering Development Tools
  • Works with K, J, N, R, S, T, E, B thermocouples for broad sensor compatibility
  • Measures -210 °C to +1800 °C with 0.0078125 ° resolution for fine detail
  • Onboard cold-junction compensation gives accurate readings without extra parts
  • Operates from 3.3 V to 5 V logic for direct microcontroller connection
  • SPI interface uses any four digital I/O pins for flexible wiring

Universal Thermocouple Breakout

The Adafruit MAX31856 breakout board provides a complete amplifier solution for engineers and hobbyists who need to read temperatures from K, J, N, R, S, T, E, or B type thermocouples. It handles cold-junction compensation and non-linearity correction internally, delivering data over a four-wire SPI interface. The module operates from a 3.3 to 5v supply and is logic-level compliant for direct microcontroller connection.

Build Quality and Daily Use

The board integrates the MAX31856 converter, a 3.3V regulator, and level-shifting circuitry onto a compact PCB that simplifies prototyping. Its pinout requires any four digital I/O pins for SPI communication, leaving analogue inputs free for other sensors. A two-pin terminal block accepts standard thermocouple leads, while the header pins suit breadboard or perfboard mounting without specialised tooling.

Upgrade Path and Fit

This board replaces the earlier MAX31855K breakout, which was limited to K-type thermocouples, and adds fault-detection alerts for out-of-range or open-circuit conditions. The jump is worthwhile when a project demands multi-type thermocouple support or requires the 0.0078125° resolution across a -210°C to +1800°C span. It is not suited for applications needing analogue voltage output or non-SPI digital protocols.

Punti di forza

  • Works with K, J, N, R, S, T, E, B thermocouples for broad sensor compatibility
  • Measures -210 °C to +1800 °C with 0.0078125 ° resolution for fine detail
  • Onboard cold-junction compensation gives accurate readings without extra parts
  • Operates from 3.3 V to 5 V logic for direct microcontroller connection
  • SPI interface uses any four digital I/O pins for flexible wiring

Caratteristiche tecniche

TypeEngineering Development Tools

Domande su questo articolo

How does the MAX31856 SPI interface limit the number of digital I/O pins needed on my microcontroller?

The SPI data connection uses any four digital I/O pins on the microcontroller for communication.

What physical mounting or connection method does the breakout board require?

The board provides standard header holes for soldering pins or wires to suit your enclosure or breadboard layout.

What is the correct sequence for wiring a thermocouple to the MAX31856 and configuring the software?

Solder headers, connect the thermocouple leads to the screw terminals matching the thermocouple type, power the board from 3.3 to 5 V, then initialise the SPI library and set the thermocouple type in code before reading temperatures.

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