All work
Hardware2024
Touch-Free Sanitizer System
An automatic hand sanitizer dispenser built from an ultrasonic sensor, a pump and a microcontroller.
The challenge
Shared dispensers defeat their own purpose. The surface everyone touches sits directly between them and clean hands.
My approach
An ultrasonic sensor triggers a small pump through a microcontroller, with the dispense volume tuned so a single pass gives enough without waste.
Key learnings
The first working prototype took an evening. Making it reliable enough to leave unattended took considerably longer.