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 :) ? :
DIY Infrared Thermometer using Arduino and MLX90614 IR Temperature Sensor
Handheld Digital LCD Temperature Thermometer Laser Non-Contact IR Infrared Gun | DIY at B&Q
DIY Non Contact IR Thermometer V1.0 : 16 Steps (with Pictures) - Instructables
1-5PCS MLX90614ESF-BAA-000-TU-ND Infrared Thermometer IR Sensor For Arduino Diy | eBay
How to make DIY IR thermometer I DIY Non-Contact Thermometer - YouTube
DIY Infrared Thermometer using Arduino and MLX90614 IR Temperature Sensor
Covid-19 Series] DIY Thermometer Using Microbit - Workshop by C-Lab - Latest Open Tech From Seeed
Infrared Thermometer with Arduino and MLX90614 Temperature Sensor - Electronics-Lab.com
Arduino - Infrared Thermometer with MDF Case - Hackster.io