Quantum Engine Fan Controller Part 1

This is designed to control the fan on my Quantum sports car after the original switch failed, and the housing would have snapped if I tried to remove the switch. The housing is also not longer available as over 30 years old, and second hand ones are in worse condition than the existing one. This is in 2 parts - the actual controller based on a DS1621 temperature switch IC, and a DigiSpark / OLED board to monitor and program it. It has been fitted for a couple of years, and works as designed. The quality of the board is brilliant, and I can highly recommend PCBWay for any future projects