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The MAX6675 Thermocouple Module + K-Type Thermocouple Sensor is an industrial-grade temperature measurement kit built for environments that far exceed the limits of standard thermistors or semiconductor sensors (like the DS18B20 or LM35). Standard thermistors struggle or burn out above 300∘C, whereas K-type thermocouples generate minute microvolt signals based on thermal differential junctions, enabling measurements up to 1024°C.

Because thermocouple millivolt output signals are tiny and prone to environmental electrical noise, the MAX6675 IC acts as a specialized precision analog-to-digital converter (ADC). It integrates an internal cold-junction compensation amplifier, a 12-bit ADC, and a thermocouple break detection circuit. Communicating over a simple read-only SPI digital interface (SO, CS, SCK), it outputs clean digital temperature readings directly to Arduino, Raspberry Pi, ESP32, or STM32 microcontrollers.

Key Features and Benefits

• Extreme Temperature Measurement Range: Accurately reads temperatures from 0°C up to 1024°C (Probe wire rating: 0∘C−600∘C continuous, peak up to 1024∘C).

• 12-Bit Digital SPI Output: Provides a high-resolution 12-bit output corresponding to a fine temperature resolution of 0.25°C.

• On-Chip Cold-Junction Compensation: Automatically cancels ambient temperature variations at the module junction for accurate absolute readings.

• Braided Stainless-Steel Shielding: Heavy-duty braided wire protects sensor lines against physical abrasion, high ambient ambient heat, and electromagnetic interference (EMI).

• Thermocouple Break Detection: Built-in hardware logic detects if the thermocouple leads are disconnected or broken and flags an error signal over SPI.

Technical Specifications

Pinout & Wiring Guide

1. Thermocouple Terminal Connections (Blue Terminal Block):

• + (Positive Terminal): Connect to the Red Wire or positive spade lug of the K-Type Thermocouple.

• - (Negative Terminal): Connect to the Blue / Black Wire or negative spade lug of the K-Type Thermocouple.

2. Microcontroller Header Interface (5-Pin Header):

• GND: Connect to Common Ground ($0\text{V}$).

• VCC: Connect to $+5\text{V}$ (or $+3.3\text{V}$ DC supply).

• SCK: Serial Clock Line (Connect to Microcontroller Digital/SPI Clock pin).

• CS: Chip Select Line (Connect to Microcontroller Digital pin).

• SO: Serial Data Output / MISO Line (Connect to Microcontroller Digital/SPI Input pin).

Arduino Code Example

#include "max6675.h"

int thermoSO = 4;
int thermoCS = 5;
int thermoCLK = 6;

MAX6675 thermocouple(thermoCLK, thermoCS, thermoSO);

void setup() {
  Serial.begin(9600);
  Serial.println("Initializing MAX6675 Thermocouple Sensor...");
  delay(500); // Allow time for MAX6675 chip stabilization
}

void loop() {
  // Read Temperature in Celsius
  float tempC = thermocouple.readCelsius();
  
  Serial.print("Current Temperature: ");
  Serial.print(tempC);
  Serial.println(" °C");

  // MAX6675 requires a minimum conversion delay of 220ms between readings
  delay(1000); 
}

Applications

• Kilns, Ovens & Furnaces: Real-time thermal logging for ceramic kilns, heat-treatment furnaces, and industrial baking ovens.

• 3D Printers & Extruders: High-temperature sensing for advanced high-temp filaments (PEEK, Nylon, Polycarbonate) on custom 3D printer hotends.

• Automotive Exhaust Gas Logging: Measures high-temperature exhaust and engine manifold temperatures.

• Boiler & Steam Systems: Monitors steam line and fluid combustion temperatures in chemical and brewing plants.

Package Includes

• 1 x MAX6675 Converter Module Board

• 1 x K-Type Thermocouple Sensor Cable with M6 Threaded Screw Probe

• 1 x 5-Pin Female-to-Female Jumper Cable Wire Assembly

Shipping & Delivery

• Free shipping on orders above ₹999 across India

• Dispatched within 1-3 business days

• Expected delivery: 3-7 business days depending on location

• Secure packaging to ensure safe transit of electronic components