MAX31855 K-Type Thermocouple Module - SPI Interface, 3.3-5V

The module operates from a wide 3.3V to 5V DC power supply. Its onboard regulator and level-shifting circuitry ensure logic-level compatibility with both 3.3V and 5V microcontrollers, making it versatile for use with Arduino, Raspberry Pi, and other development boards.

No. The MAX31855 chip is specifically calibrated for use with K-type thermocouples. It will not provide accurate readings with J, T, E, or other thermocouple types. You must use a standard K-type thermocouple probe.

The module communicates via a standard 3-wire SPI interface (CS, SCK, SO). Connect these pins to any digital I/O pins on your microcontroller. You will need to implement or use a library for the MAX31855 SPI protocol to read the compensated digital temperature value.

The module outputs temperature in 0.25°C increments. However, the overall system accuracy is determined by the K-type thermocouple itself, which typically has an accuracy in the range of ±2°C to ±6°C. The MAX31855 provides precise digital conversion of the thermocouple's signal.

The MAX31855 chip performs automatic cold-junction compensation using its internal temperature sensor, so no user calibration is typically required for the module itself. For highest accuracy, ensure your thermocouple probe is in good condition and properly connected to the terminal block.