Infrared Thermometer with Sensor MLX90614

The author from Warsaw developed an infrared thermometer with an MLX90614 sensor, a seven-segment HP QDSP-6040 display and an ATtiny2313 MCU microcontroller. The sensor allows you to measure temperature in the range: -70 - 380 ° C. The ATtiny2313 microcontroller communicates with the sensor via the SMBus bus.

The measured temperature value is displayed on the display.

The current per segment of the display is set to 4.67 mA, so the display can be easily connected directly to the MCU.
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In the first solution, an ML2020 battery was used as a power source.



But then the author replaced it with a 200 mAh battery with a TP4056 charging module.



IR thermometer housing made of epoxy resin



The IR thermometer circuit is shown in the figure above.


Demo video showing the operation of the infrared thermometer

Link to the source file for ATtiny2313 MCU.