Tank Water Level Indicator

Hii friend,

Today I am going to make tank water level indicator using BC547 transistor.This circuit will show water level.

Let's get started,

Components required -

(1.) Transistor - BC547 x3

(2.) LED - 3V x3 (any color)

(3.) Resistor - 220 ohm x1

(4.) Battery - 9V x1

(5.) Battery clipper x1

Fold all pins of all BC547 transistors as picture.

BC547 Transistor (NPN ) -

1. First pin is Collector.

2. Second pin is base and

3. Third pin is emmiter.

Next we have to solder LED in transistor.

Solder -ve pin of LED to the collector pin of transistor.

Connect all LEDs in transistors like as picture.

Next connect all +ve pins of all LEDs as shown in picture.

Next connect all emmiter pins of all transistors as solder in picture.

Now solder 220 ohm resistor to the common +ve wires of all LEDs as shown in picture.

NOTE : If you want to connect 12V power supply then connect 330 ohm resistor instead of 220 ohm resistor.

Next connect battery clipper wire to the circuit .

Solder +ve wire of battery clipper to 220 ohm resistor and -ve wire to common emmiter pins of the transistor.

Now connect three wire in the base pins of all transistors as solder in picture.

We need to connect one more wire.

Solder a wire in the +ve wire of battery as shown in the picture.

Now circuit is completed

Bind all wires as shown in the picture.

+ve wire of battery should be in the bottom then its upper base wire of transistor and next its upper base wire of transistor as you can see in the picture.

Connect battery to the circuit and put (hold) wires in level as you want.

In picture as you can see when water level in between +ve wire of battery and base wire of 1st transistor then only one LED is glowing.

In this type when water level increases then 2nd LED is also glowing and this type 3rd LED glowing.

This type we can make tank water level indicator.

Thank you