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High Precision Thermocouple Module MAX31856 Development Board with AD Converter
High Precision Thermocouple Module MAX31856 Development Board with AD Converter
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MAX31856 High Precision Thermocouple Module — SPI, 8 Thermocouple Types, −10 to +1800°C
A high-precision thermocouple-to-digital converter module based on the Maxim MAX31856 IC, supporting all major thermocouple types (B, E, J, K, N, R, S, T) via SPI interface. Provides 19-bit resolution with 0.0625°C LSB and built-in cold-junction compensation, eliminating the need for a separate reference junction thermometer. Ideal for high-temperature measurement in industrial, laboratory, and maker applications with Arduino, ESP32, and Raspberry Pi.
Technical Specifications
| Parameter | Value |
|---|---|
| IC | Maxim MAX31856 |
| Interface | SPI (MOSI, MISO, SCK, CS) |
| Thermocouple Types | B, E, J, K, N, R, S, T (software selectable) |
| Temperature Range | −10°C to +1800°C (thermocouple dependent) |
| Resolution | 0.0625°C (19-bit) |
| Accuracy | ±0.15°C (cold junction), ±0.7°C (thermocouple) |
| Cold Junction Compensation | Built-in (−40°C to +125°C) |
| Fault Detection | Open circuit, short to VCC/GND, over/under temperature |
| Supply Voltage | 3.3V – 5V DC |
| Operating Temperature | −40°C to +85°C (module) |
| Certification | RoHS |
Supported Thermocouple Types & Ranges
| Type | Range | Common Use |
|---|---|---|
| K | −200 to +1372°C | General purpose, most common |
| J | −210 to +1200°C | Industrial furnaces, plastics |
| T | −270 to +400°C | Cryogenic, food processing |
| E | −270 to +1000°C | Highest sensitivity type |
| N | −270 to +1300°C | High-temp stability |
| R / S | −50 to +1768°C | Platinum, lab & metallurgy |
| B | +250 to +1820°C | Very high temperature |
Typical Applications
- 3D Printer Hotend: High-accuracy hotend temperature measurement for all-metal hotends exceeding the 300°C limit of NTC thermistors
- Reflow Oven Control: Precise temperature profiling for SMD reflow soldering ovens using K-type thermocouples
- Industrial Furnace Monitoring: High-temperature process monitoring in kilns, heat treatment furnaces, and industrial ovens
- PID Temperature Controllers: Input sensor for Arduino/ESP32-based PID temperature controllers for sous vide, brewing, and lab equipment
- Welding & Metalworking: Workpiece temperature monitoring during welding, brazing, and heat treatment processes
- HVAC & Boiler Systems: Flue gas temperature measurement in boilers and HVAC exhaust systems
Arduino Wiring
- VCC → 3.3V or 5V | GND → GND
- SCK → Arduino D13 | MISO → D12 | MOSI → D11 | CS → D10
- Install
Adafruit MAX31856library via Arduino Library Manager - Use
thermocouple.readThermocoupleTemperature()for thermocouple reading
FAQ
Q: Does this module work with K-type thermocouples?
A: Yes. K-type is the default and most common configuration. The thermocouple type is software-selectable via SPI register write.
Q: Is cold-junction compensation automatic?
A: Yes. The MAX31856 has a built-in cold-junction temperature sensor and automatically applies compensation — no external reference thermometer is needed.
Package Contents
- 1 × MAX31856 thermocouple module (thermocouple probe not included)
