Type K Thermocouple Reader Module (MAX31850) 1-Wire

Want to integrate a Type K thermocouple into your DIY project with an ESP32 or ESP8266? This module is the solution. Based on the MAX31850 chip, this amplifier converts the thermocouple's low-voltage analog signal into precise digital data, accessible via the popular 1-Wire protocol.

It's the perfect component to create your own high-temperature sensors (for ovens, 3D printers, boilers) and send them to Home Assistant (via ESPHome or Tasmota) or integrate them with your Shelly ecosystem using MQTT.

⚙️ Technical Specifications

• Main Chip: MAX31850K

• Communication Protocol: 1-Wire (Requires only one data pin)

• Probe Compatibility: Designed exclusively for Type K Thermocouple .

• Operating Voltage: 3.0V to 3.6V (compatible with 3.3V logic of ESP32/ESP8266).

• Measurement Range (Chip): -200°C to +700°C (with an accuracy of ±2°C).

• Resolution: 14 bits, 0.25°C.

• Additional Features:

  • Integrated cold junction compensation.

  • Fault detection (open thermocouple or short circuit to GND/VCC).

• Connectors:

  • 2-pin screw terminal block for thermocouple (Type K).

  • Connection pins: VCC, GND, DATA.