Hello friends, in this instructable you will see how to make a simple automatic water level controller.so let's begin...
Step 1: Things Needed
> bc547 npn transistor - 2 pcs.
> 12v relay - 4 pcs
> 100 ohm resistor - 2pcs.
> rainbow cable.
> Red led - 1pcs.
> white led - 1pcs.
after getting all these things. let's begin....
Step 2: Circuit Diagram
just watch the video to study the circuit diagram...
Step 3: Working
it works as when the upper sensor detects water it turns the outlet off by and when water level goes below medium it switches on the relay and this process goes on.