Water Level Indicator with Buzzer Using BC 547 Transistor
COMPONENTS REQUIRED:
Transistor BC547 (4)
Buzzer
LED (3)
Resistor 330Ω (4)
Resistor 220Ω (3)
Battery (9V)
CONNECTIONS:
Make the connections as shown in the circuit diagram
WORKING:
This water level indicator circuit with an alarm works properly when the sensing wires L1 – L4 and common supply wires are placed correctly in the water tank, use insulation less wire (remove the insulation plastic and use conducting core) in the tank and first place the common supply wire to the possible bottom of the water tank and it should be below the L1 wire, next thing you can place the level wires L1, L2, L3 and L4 with different height level in the water tank. Each level of wires is connected to the separate transistor base and transistors Q1 – Q4 are connected with LED indicators and one buzzer device, this circuit is powered by the 9V battery.
When the supply is applied to this circuit all transistors are works as a switch and if it doesn’t have a base supply then it reacts as an open switch, if the tank water fills and connects the common supply wire to level wires (L1 – L4) corresponding transistor will get base supply and reacts as a closed switch, then LED starts to glow, Buzzer produce alert sound when the water reaches L4 wire.
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