MAX6675 Relay Module – K-Type Thermocouple Sensor, SPI Interface
MAX6675 Thermal Sensor Relay Module – K-Type Thermocouple Amplifier with 5V Relay
The MAX6675 Thermal Sensor Relay Module combines a precision K-type thermocouple amplifier with an onboard 5V relay, enabling direct temperature measurement and switched output control. Ideal for automating heating, cooling, or alarm systems, it communicates temperature readings via SPI to microcontrollers like Arduino or ESP32. The module simplifies high-temperature monitoring with a relay that can handle up to 10A loads.
Key Specifications
| Specification | Value |
|---|---|
| Temperature Range | 0°C to 1024°C |
| Resolution | 12-bit (0.25°C) |
| Interface | SPI (3.3V/5V compatible) |
| Relay Rating | 10A @ 250VAC / 30VDC |
| Supply Voltage | 3.3V to 5.5V |
| Thermocouple Type | K-Type (not included) |
What You Can Build With This
- 3D printer heated bed temperature controller
- Home brewery fermentation monitor with relay-triggered cooling
- Barbecue smoker temperature alarm system
- Greenhouse heater automation using setpoint thresholds
Compatibility
This module works seamlessly with Arduino Uno, Mega, ESP32, and Raspberry Pi using SPI communication. The logic level is 3.3V/5V tolerant, so direct connection to most microcontrollers is safe. Pair it with any standard K-type thermocouple probe for accurate readings.
Wiring Notes
Connect SO, CS, and SCK to your microcontroller's SPI pins (e.g., Arduino Uno pins 12, 10, 13). Attach the thermocouple wires to the designated terminals, ensuring correct polarity (yellow positive, red negative). The relay terminals (NO, COM, NC) support loads up to 10A; use proper gauge wire and insulation for high‑current applications.
Why Buy from Compoden
Every component is sourced from verified suppliers and tested for compatibility before listing. We've spent 10 years building projects for makers, schools, and institutions across India. Ships from Bengaluru in 3-5 days. If defective on arrival, replace within 7 days.
Is this compatible with Arduino Uno?
Yes, connect the module directly to the Uno's SPI header. Use digital pin 10 for CS, and the SPI library for temperature data acquisition.
What thermocouple do I need?
You need a K-type thermocouple probe, sold separately. Ensure it is rated for the temperatures you plan to measure and connect with correct polarity.
Can the relay switch mains voltage?
The relay is rated for up to 250VAC. Always use proper wiring practices and consider external fusing for safety when switching mains-powered devices.
📦 Free Setup Handoff Document Included
Every Compoden order includes a free setup handoff document — step-by-step instructions to get your component working within minutes. Download it via QR code on your package. The handoff document is also trained to help you troubleshoot the majority of problems.
Ask Soldr above what you can build with this — it knows every Compoden kit this part appears in.
Shipping Information
- Prepaid Orders: ₹75 for orders up to ₹999, FREE shipping above ₹999
- COD Orders: ₹125 shipping + ₹50 COD fee = ₹175 total
- Delivery Timeline: Dispatch in 1-2 days, delivery in 2-7 days depending on location
Returns & Warranty
- 7-Day Return: Manufacturing defects only (approval required)
- Warranty: 7 days from delivery
- Non-Returnable: Batteries, consumables, cut wires, clearance items