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I will Teach you how to make a simple water sensor circuit
Parts List1 General Purpose NPN Transistor $0.101 50K Trimpot $0.151 47ohm Resistor $0.011 LED $0.081 Proto Board or You can etch A PCB1 3 volt power source battery, ...
Read Circuit Diagram
The Schematic is made with ExpressPCB which is a free PCB Layout Software you can download it here Than Download the PCB file and open and print it ...
Build time will update once I make the PCB
Here are some mock ups of how to connect it to a HHO Cell or just detect water.
Here is how to setup the circuit to run on 12 volts from a car battery the circuit is still the same just some resistors are added to ...
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