Hello friends this is my another video, this is a simple project which is very useful in every home, the main attribute of this project is that, it is very simple and anybody can make this with almost zero knowledge of electronics.

I also installed this kit in my home and it is working very good from 2 years.

Basically this is a water level Indicator, in this circuit I am using 4 NPN Transistors, so it can indicate total four level of Water, three levels are indicated by Led's and fourth level which indicate full is indicated by a buzzer.

Step 1: Gather the Material

1. 1 PC Zero/ general purpose PCB :1

2. 4 PCS BC 547 Transistors

3. 3 PCS LED'S

4. 1 PC BUZZER

5. 3 PCS RESISTANCE 330 OHM

6. 4PCS RESISTANCE 10K

7. 1 PC 9 Volt Battery

8. 1 PC Battery Holder

9. Soldering Wire

10. Solder

11. Connecting Wire

Step 2: Make the Circuit

First of all make a circuit as shown in image

In this circuit lowest wire (Red Wire) is connected with Vcc and Yellow Wire is connect with Transistor T1 and so on. When water level is touch with wire B, a small current passed into water and this current also passed into base of Transistor T1, in this condition Emitter and Collector of Transistor T1 are short circuited and LED become glowing.

This theory work with all the Transistors