If you have hard water, did you ever forget to add salt to the water softener tank? This electronic device monitors how full the tank is using a Sharp DP2D12 infrared distance sensor. The results are displayed on a custom wall plate with a multicolor LED bar graph. The project also includes several photosensors to save power.

Go to Water-Softener Brine-Tank Salt-Level Monitor
Go to Water-Softener Brine-Tank Salt-Level Monitor
www.robotroom.com