MAX31855K K-type thermocouple amplifier breakout with on-board 3.3 V regulator, cold-junction compensation, and SPI output. Reads thermocouple temperature digitally with no analogue input required; upgrade from the MAX6675.
3.3V power supply (Adafruit breakout accepts 3.3V–5V via onboard regulator)
Ground
SPI clock input
SPI chip select (active low); must not be shared with other SPI devices
SPI data output (MISO); read-only device
Not connected — MAX31855 is a read-only SPI device; no data is written to it
K-type thermocouple positive lead
K-type thermocouple negative lead
| Pin | Type | Function | Voltage |
|---|---|---|---|
| VCC | Power | 3.3V power supply (Adafruit breakout accepts 3.3V–5V via onboard regulator) | 3.3 |
| GND | Ground | Ground | |
| SCK | SPI | SPI clock input | |
| CS | SPI | SPI chip select (active low); must not be shared with other SPI devices | |
| SO | SPI | SPI data output (MISO); read-only device | |
| MOSI | SPI | Not connected — MAX31855 is a read-only SPI device; no data is written to it | |
| T+ | Analog | K-type thermocouple positive lead | |
| T- | Analog | K-type thermocouple negative lead |
3.3V power supply (Adafruit breakout accepts 3.3V–5V via onboard regulator)
Ground
SPI clock input
SPI chip select (active low); must not be shared with other SPI devices
SPI data output (MISO); read-only device
Not connected — MAX31855 is a read-only SPI device; no data is written to it
K-type thermocouple positive lead
K-type thermocouple negative lead
I2C · SPI · Single data line · 3.3 – 5 V · Breakout
Verify supply voltage and logic levels before powering up.
Module pins: VCC, GND, SCK, CS, SO, MOSI, T+, T-. Schematik maps them to your board in the app.
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