DC 3-5V MAX6675 Module + K Type Thermocouple Temperature Sensor
What Is This Module?
A temperature measurement system consisting of: MAX6675 IC module (digital converter) K-Type thermocouple probe (temperature sensor)
Designed to measure very high temperatures accurately and convert them into digital data for microcontrollers.
K-Type Thermocouple (Sensor)
A thermocouple made of two dissimilar metals that generate voltage when exposed to temperature differences.
Type: K-Type (Chromel'Alumel)
Probe Type: M6 threaded screw (easy mounting in surfaces or machines)
Temperature Range: Typical: 0C to 800C Maximum: up to ~1024C
MAX6675 Module (Converter)
Converts thermocouple voltage digital temperature data
Uses cold-junction compensation for accurate readings
Communicates with microcontrollers via SPI interface
Key Features
High Temperature Measurement: Up to ~1024C
Digital Output: No need for analog amplification
SPI Communication: Reliable and fast
Built-in Cold Junction Compensation
Good Accuracy for high-temp sensing
Ready-to-use module with thermocouple probe
Technical Specifications
MAX6675 Module
Parameter | Value |
Operatin5.5 V | |
Interface | SPI (Serial) |
Resolution | 0.25 C |
Temperature Range | 0 C to 1024 C |
Accuracy | 2 C (typical) |
Conversion Time | ~220 ms |
K-Type Thermocouple
Parameter | Value |
Type | K-Type (Chromel'Alumel) |
Probe Style | M6 screw mount |
Cable Type | Fiberglass / insulated |
Temperature Range | up to ~8001000 C |
Response Time | Fast |
Pin Configuration (MAX6675)
VCC 3.3V / 5V
SCK Serial Clock
CS Chip Select
SO Serial Data Output
Uses SPI protocol (read-only device).
How It Works
Thermocouple senses temperature and produces a small voltage (V level).
MAX6675 amplifies and converts this into digital temperature data.
Data is sent to microcontroller via SPI communication.
Microcontroller reads and displays temperature.
Applications
Industrial temperature monitoring
Furnaces & kilns
3D printer hotends
Boilers & heating systems
Metal processing & welding
Important Notes
Only Positive Temperatures: Cannot measure below 0C.
SPI Read Delay: New reading every ~220 ms.
Proper Wiring: Thermocouple polarity must be correct.
Noise Sensitivity: Keep wires short or shielded in noisy environments.
Better Alternative: MAX31855 (supports negative temperatures).
Summary
Sensor Type: K-Type thermocouple
Interface: SPI (via MAX6675)
Range: 0C to ~1024C
Resolution: 0.25C
Use Case: High-te