The kit Simple Water Level Indicator Using Transistor is very easy to build four led for indication of levels in sequence and a buzzer is used to indicate over flow condition, for using the circuits attach the six wires or probes in the water tank at your desired level. The LED will light up when water will touch these six wires and this will indicate the level of water has reached on your desired level.
The Kit Simple Water Level Indicator consisting of 6 sensing probes which is dipped in water to sense the level of water. The probe A is connected as common to other five, which should be at the bottom most part of the water tank, also it act as a reference level. The probes B, C, D, E and F are set as levels. Mount it inside your home with the indicator LED’s pointing out of the box. A short length five, wires can be used as sensing probes and for common sensor Probe A. When water in the tank touches the probe A and B both, a small current flows from A to B through water and to the base of transistor T1. As a result the transistor conducts causing the led D1 to glow. Similarly, when water touches sensor C, led D2 glow. Finally, when the water touches sensor F, buzzer start beep which is indicate to overflow condition.