Tank empty! No water! You do not like it. Let's make automatic water level controller circuit. Keep constant water. Simple parts. You can do.
This is simple Solar plant watering alarm circuit. It will sound alarms when the soil is dry. The trees have died. It the solar sell is 6V DC power supply
This is Simple high water level alarm circuit diagram which we need to build it since: fish pond The water level will drop rapidly. We need to check water
Simple ideals of soil moisture detector circuit projects, can alarm with LED and buzzer, and controller as water for plants