Make a Non-Contact Infrared Thermometer with MLX90614 IR Temperature Sensor

This portable non-contact infrared thermometer relies on the MLX90614 sensor to measure temperature without physically touching the target object. All objects emit infrared radiation proportional to their temperature. The MLX90614 sensor detects this invisible radiation using an internal thermopile detector and calculates both the ambient temperature and the object's surface temperature. The Arduino Pro Mini acts as the central processing unit, communicating with the sensor over the I2C protocol to fetch these temperature readings. When you press the push button powered by the 9V battery, the Arduino wakes up or triggers the system to take a measurement. Simultaneously, an aligned laser diode can be activated to visually indicate the center of the target area being measured. Once the data is processed, the Arduino sends the temperature values via I2C to the SSD1306 OLED display, which renders the numbers clearly on a bright graphical screen using the Adafruit GFX and SSD1306 libraries. Power management via a battery clip ensures the entire circuit remains mobile and self-contained.