MAX6675 K-Type Thermocouple Sensor Module with M6 Probe for Arduino - Image 1
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MAX6675 K-Type Thermocouple Sensor Module with M6 Probe for Arduino

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Description

🔧 MAX6675 K-Type Thermocouple Sensor Module with M6 Probe | AuscomTech

This MAX6675 temperature sensing kit includes the thermocouple interface module and an M6 K-type probe, making it ready for Arduino and microcontroller temperature measurement projects.

The module converts thermocouple input into digital temperature data using an SPI interface, allowing reliable readings from high-temperature applications where standard sensors are not suitable.

Typical use includes heater monitoring, ovens, hot plates, 3D printer experiments, furnace testing, and DIY automation systems requiring a mounted metal probe.

⭐ Key Features

  • Module and Probe Included – Supplied with the MAX6675 board and M6 K-type thermocouple probe.
  • SPI Digital Interface – Connects using GND, VCC, SCK, CS, and SO pins for simple microcontroller communication.
  • Arduino Compatible – Suitable for Arduino, ESP32, Raspberry Pi, and other compatible development boards.
  • High Temperature Measurement – Designed for K-type thermocouple sensing where higher temperatures are required.
  • 0.25°C Resolution – Provides fine measurement resolution for monitoring and control projects.
  • Cold Junction Compensation – Built-in compensation helps improve temperature reading stability.
  • M6 Screw Probe – Threaded probe head allows more secure mounting in compatible surfaces or brackets.
  • Compact PCB Design – Small board size is easy to install inside control panels and electronics projects.

📊 Technical Specifications

  • Converter IC: MAX6675
  • Sensor Type: K-type thermocouple
  • Included Probe: M6 screw-head thermocouple probe
  • Working Voltage Range: 3.0V to 5.5V
  • Power Supply Voltage: 3V to 5V DC
  • Working Current: approx. 50mA
  • Interface Pins: GND, VCC, SCK, CS, SO
  • Output Mode: SPI digital signal
  • Temperature Measuring Range: -200°C to 1300°C
  • Test Procedure Range: 0°C to 1023°C
  • Measurement Accuracy: ±1.5°C
  • Temperature Resolution: 0.25°C
  • Working Temperature Range: -20°C to 85°C
  • Storage Temperature: -50°C to 150°C
  • Module Size: approx. 32mm × 16mm

🧩 Typical Applications

  • Arduino temperature monitoring
  • ESP32 and Raspberry Pi sensor projects
  • Oven and hot plate temperature sensing
  • Heater and thermal control systems
  • 3D printer temperature experiments
  • Furnace and kiln monitoring projects
  • DIY automation and data logging
  • Industrial temperature feedback projects

⚠️ Important Notes

  • Actual usable temperature range depends on the thermocouple probe construction, insulation, mounting, and application conditions.
  • This product includes the module and probe, not just the breakout board.
  • Requires compatible SPI wiring and software/library support.
  • Check pin connections before applying power.
  • Not intended for direct mains voltage measurement or unsafe high-voltage contact.

📦 Package Includes

  • 1 × MAX6675 K-Type Thermocouple Sensor Module
  • 1 × M6 K-Type Thermocouple Probe

🔗 Recommended Accessories (Not Included)

  • Arduino UNO or Nano – basic temperature reading and control projects
  • ESP32 development board – wireless temperature monitoring
  • Jumper wires – connecting the module to controller headers
  • MicroSD data logger module – saving temperature readings over time

📌 Code Examples & Usage – MAX6675 K-Type Thermocouple Temperature Sensor Module

📋 Overview

The MAX6675 module lets Arduino/ESP32 read temperatures from a K-type thermocouple using a simple SPI-style interface.

Ideal for:

  • 3D printer / hotend monitoring

  • BBQ / smoker temperature monitoring

  • Heaters & ovens

  • Metal / plastic processing

  • High temperature experiments

The MAX6675 provides a digital temperature reading and includes cold-junction compensation.

⚙ Key Details

  • Sensor type: K-type thermocouple

  • Temperature range (module): 0–600°C (typical)

  • Interface: SPI-like (SO / SCK / CS)

  • Logic voltage: 3.3V–5V compatible (module dependent)

  • Update rate: ~0.25 seconds (approx.)

📌 Important: MAX6675 does not measure below 0°C.

🔌 Wiring (SPI-Style)

MAX6675 Pins

MAX6675 Pin Function
VCC 3.3V or 5V
GND Ground
SCK Clock
CS Chip Select
SO Data Out (MISO)

📌 This module is read-only (no MOSI needed).

🔌 Wiring – Arduino Uno Example

MAX6675 Arduino Uno
VCC 5V
GND GND
SCK D13
CS D10
SO D12

🔌 Wiring – ESP32 Example

MAX6675 ESP32
VCC 3.3V
GND GND
SCK GPIO18
CS GPIO5
SO GPIO19

📦 Library Installation (Arduino IDE)

  1. Arduino IDE → Sketch → Include Library → Manage Libraries

  2. Search for MAX6675

  3. Install MAX6675 library by Adafruit (recommended)

🧪 1️⃣ Arduino Example – Basic Temperature Read

#include "max6675.h"

int thermoSO = 12;
int thermoCS = 10;
int thermoSCK = 13;

MAX6675 thermocouple(thermoSCK, thermoCS, thermoSO);

void setup() {
Serial.begin(9600);
delay(500); // allow MAX6675 to stabilise
}

void loop() {
Serial.print("Temp (C): ");
Serial.println(thermocouple.readCelsius());
delay(500);
}

🧪 2️⃣ ESP32 Example – Basic Temperature Read

#include "max6675.h"

int thermoSO = 19;
int thermoCS = 5;
int thermoSCK = 18;

MAX6675 thermocouple(thermoSCK, thermoCS, thermoSO);

void setup() {
Serial.begin(115200);
delay(500);
}

void loop() {
Serial.print("Temp (C): ");
Serial.println(thermocouple.readCelsius());
delay(500);
}

🧪 3️⃣ Simple “Over-Temp Alarm” Example

#include "max6675.h"

int thermoSO = 12;
int thermoCS = 10;
int thermoSCK = 13;

const int buzzerPin = 8;
const float alarmTemp = 80.0;

MAX6675 thermocouple(thermoSCK, thermoCS, thermoSO);

void setup() {
Serial.begin(9600);
pinMode(buzzerPin, OUTPUT);
delay(500);
}

void loop() {
float t = thermocouple.readCelsius();

Serial.print("Temp (C): ");
Serial.println(t);

if (t >= alarmTemp) {
digitalWrite(buzzerPin, HIGH);
} else {
digitalWrite(buzzerPin, LOW);
}

delay(500);
}

🔧 Thermocouple Connection Notes (Very Important)

K-type thermocouples are polarity sensitive:

  • Yellow = + (positive)

  • Red = – (negative)

If connected backwards, readings may be unstable or incorrect.

✔ Ensure the thermocouple screws are tight
✔ Avoid using random copper wire extensions (use thermocouple extension wire for accuracy)

🧠 Troubleshooting

Reading stuck at 0°C or very low

  • Thermocouple not connected properly

  • Loose terminal screws

  • Wrong thermocouple type (must be K-type)

Reading is noisy / jumps around

  • Long thermocouple leads near motors/heaters → add shielding / keep away from noise

  • Ensure common ground and stable power supply

Reading doesn’t update quickly

  • MAX6675 has a limited refresh rate (normal behaviour)

Additional information

Weight 50 g
Dimensions 260 × 160 × 20 mm

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