What we need?
The material we need to make this circuit its really little. I found all the material really easy. You will need:
nand shmith IC (I use 74S132)
a npn transistor
3- 1K resistor
1- 1.2 M resistor
1- 10 K resistor
1- potenciometro 50K
one electrolitic capacitor 10uF 100V
one diode 1n4007 or similar
4 header terminals with two screws
one relay of 12v
a copper plaque of 7X7 CM
Step 1: Schematic
This is the schematic circuit:
Step 2: The Circuit
there you will find the pcb ready to print and transfer directly to you copper board. The circuit looks like this:
Step 3: Setting Up
1. Connect the probes
The probes are only two wires that goes to the ground. For better use you can attach two nails in the end of the cable, and when the nails get rusty you just have to chance the nails and not the full cables.
2. Connect the water pump.
Cut carefully the cable of the water pump, the place the two ends in the header blocks named pump in and pump out. It doesn't matter what cable you use like in and what cable you use like out, but you have to make sure to place the right end with the right end. *Caution, all the connections have to be made with the current unplug. Electricity is dangerous and can kill you. Take care of your life.
3. Connect the voltage source
If you use batteries or a wallet connection, be sure you get the Voltage in the right polarity.
We recommend strongly to use a solar water pump. The initial cost is higher, but in the end you don't waste batteries or energy from your house. Also you help the planet. If you don't know the solar water pumps here is an image.
Get the probes in ground separate by 2 or 3 cm. Connect the voltage source to the circuit and you are ready to go.
Step 4: Thanks
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I hope you like the site, and please fell free to comment :)