One thing that annoyed [Jashua] to no end was hearing his automated sprinkler system kick on in the middle of the night, when it had rained earlier in the day. He wished that his sprinklers were a … ...

Using a flow meter, he measures how much water leaves the tank. Assuming that you know it was once full, you can deduce how much water is left. Using a YF-S201 flowmeter on a Raspberry Pi, the ...