This is the circuit diagram of drinking water alarm based a small water sensor by using aluminium foil and plastic foil, and connected to a very simple alarm based a 555 IC timer.
The Jal State Board supplies water for a limited duration in a day. The time for water supply is determined by administration and the community does not know the same. In this situation, this water alarm circuit would save people from waiting a long time because they would notify them as soon as the water supply began.
At the heart of this circuit is a small water sensor. To make this water sensor, you need two foils – aluminum foil and plastic foil. You can assemble sensors by rolling aluminum and plastic foil in concentric cylindrical shapes. Connect one end of the insulated flexible cable to the aluminum foil and the other end to resistor R2. Now install this sensor in the tap so that the water can flow through it without interruption. To complete the circuit, connect another cable from the junction of pins 2 and 6 IC1 to the water pipe or water tap itself.
Timer 555 is transferred as an astable multivibrator. The multivibrator will only function when water flows through the water tap and completes the circuit connection. Oscillates at about 1 kHz. The output of the timer on pin 3 is connected to the LS1 loudspeaker via capacitor C3. As soon as the water starts flowing through the tap, the loudspeaker starts to ring, which signifies the resumption of the water supply. It remains ‘active’ until you turn off the circuit by switching S1 or removing the sensor from the tap. This circuit works with a 9V power supply.
Install the circuit on each general purpose PCB and house in a suitable cabinet. The water sensor is inserted into the water tap. Connect the end of the junction 555 pin 2 and 6 to the water tap body. Use the S1 on / off switch to turn on the circuit with a 9V PP3 battery.