Drinking Water Alarm

This alarm is for those where there is scarcity of water.. and government supply water at any time with out any certain management.
The State water Boards supply water for limited duration in a
day. Time of water supply is decided by the management and the
public does not know the same. In such a situation,
this water alarm circuit will save the people from long wait as it
will inform them as soon as the water supply starts.
Apparatus need to prepare this..

• ON-OFF switch
• Resistor & capcator
• Speaker
• IC's IC LM555
• Aluminum foil
• and senser

At the heart of this circuit is a small water sensor. For fabricating
this water sensor, you need two foils—an aluminium foil and a plastic
foil. You can assemble the sensor by rolling aluminium and plastic foils
in the shape of a concentric cylinder. Connect one end of the insulated
flexible wire on the aluminium foil and the other end to resistor R2. Now
mount this sensor inside the water tap such that water can flow through
it uninterrupted. To complete the circuit, connect another wire from
the junction of pins 2 and 6 of IC1 to the water pipeline or the water tap
itself.
   The working of the circuit is simple. Timer 555 is wired as an astable
multivibrator. The multivibrator will work only when water flows through
the water tap and completes the circuit connection. It oscillates at about
1 kHz. The output of the timer at pin 3 is connected to loudspeaker LS1 via
capacitor C3. As soon as water starts flowing through the tap, the speaker
starts sounding, which indicates resumption of water supply. It remains
‘on’ until you switch off the circuit with switch S1 or remove the sensor
from the tap. The circuit works off a 9V battery supply.
Assemble the circuit on any general- purpose PCB and house in a
suitable cabinet. The water sensor is inserted into the water tap. Connect
the lead coming out from the junction of 555 pins 2 and 6 to the body of
the water tap. Use on/off switch S1 to power the circuit with the 9V PP3
battery
This is the cheapest project to prepare as a mini project

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