Ultrasonic sensor with onion

[Oliver33]

Checkout his project writeup:

Project by Denver42165; Water Tank Level Sensor

Denver42165 just shared a new project: "Water Tank Level Sensor" [image] Imagine getting home from work, its winter, its cold. You have a shower to warm up and half way through your shower… your water stops. You wrap a towel around yourself, remove the shampoo from your eyes and go out into the cold to swap the tanks as the water tank you were using had run dry. This was a common occurrence in my house… but not anymore. Now I can keep visually see the level of water in my water tanks on my iP…

I’d bet it’s the same application