My most "serious" DIY project: build a infrared thermometer by MDF 3mm case, cut by laser. Electronics component from Arduino, OLED screen, and infrared thermometer sensor GY-906. It looks perfect, right :) ? :
Arduino Project: IR thermometer using the MLX90614 IR temperature sensor from icstation.com - YouTube
Making IR Thermometer using Arduino and Infrared Temperature Sensor | Infrared thermometer, Electronics projects, Arduino projects
Arduino Based Digital Thermometer - ElectronicsHub
Non-contact Infrared temperature sensor using Arduino - Hackster.io
DIY Non-Contact Infrared Thermometer Using Arduino
Non-contact Infrared temperature sensor using Arduino - Hackster.io
Contactless Thermometer using Arduino with SD card temperature logger - Activities - PCBway
Modular Arduino Based Infrared Thermometer | Hackaday
An open-source non-contact thermometer using low-cost electronic components - ScienceDirect