Simple Water Sensor
I will Teach you how to make a simple water sensor circuit
Gather Parts
Parts List
1 General Purpose NPN Transistor $0.10
1 50K Trimpot $0.15
1 47ohm Resistor $0.01
1 LED $0.08
1 Proto Board or You can etch A PCB
1 3 volt power source battery, wall wart, whatever
1 General Purpose NPN Transistor $0.10
1 50K Trimpot $0.15
1 47ohm Resistor $0.01
1 LED $0.08
1 Proto Board or You can etch A PCB
1 3 volt power source battery, wall wart, whatever
Learn the Layout
[Play Video]
Read Circuit Diagram
Read Circuit Diagram
Create PCB (skip Step If Using Proto Board)
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 and make your PCB. Here are a few links to Instructibles that show you how to make a PCB
water sensor.pcb is 3v
water sensor2.pcb is 12v
these PCB schematics are free to use if I see them being sold buy anyone but me you will be contacted
5pcb
Cheap and Easy Toner Transfer for PCB Making
The Saltwater etch process
Than Download the PCB file and open and print it and make your PCB. Here are a few links to Instructibles that show you how to make a PCB
water sensor.pcb is 3v
water sensor2.pcb is 12v
these PCB schematics are free to use if I see them being sold buy anyone but me you will be contacted
5pcb
Cheap and Easy Toner Transfer for PCB Making
The Saltwater etch process
Build It
Build time will update once I make the PCB
Connect to HHO Cell or Any Other Water Sensing Probe
Here are some mock ups of how to connect it to a HHO Cell or just detect water.
12 VOLT CIRCUIT
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 the probes to protect the transistor and a larger resistor to protect the LED