Water Level Sensor Alarm

this water level sensor can alarm you when water reaches at the top of your tank

the materials needed are
Transistor bc 548
2 resistors 220 ohms
red led
buzzer (optional)
battery 9v
wires
9v battery cap

Take your transitor and connect 2 wires to the middel wire and the right hand side wire.

Then take one 220 ohms resitor and connect it to anyone of the wires coming out

At first connect a resistor to the longer leg of the led

Then connect a wire to the led 's resistors leg

after it comes the bit confusing part Conneting the transistor circit to the led circit to do it connect one wire to the one leg of the transistor circit's resistor

now you'll be left with 3 wires 2 from the transistor circit and 1 from the led circit

one leg of the led will be left

Now take the battery cap and then connect the black wire to the left leg of the led and red wire to the transistor circit's resistor's wire

now you'll be left with 2 wires you may connect then to electrodes.

when the electrodes will br dipped in water the led will glow