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: 0°C to 800°C
• Maximum: up to ~1024°C
Fast response and suitable for harsh environments
⚙️ 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 ~1024°C
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
Operating Voltage
3.0 V – 5.5 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 ~800–1000 °C
Response Time
Fast
🔌 Pin Configuration (MAX6675)
VCC → 3.3V / 5V
GND → Ground
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 (µV 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
High-temperature research projects
⚠️ Important Notes
Only Positive Temperatures: Cannot measure below 0°C.
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: 0°C to ~1024°C
Resolution: 0.25°C
Use Case: High-temperature measurement