Vibration detection alarm using IC555

Circuit Description:

1. IC555 Timer:
   • The IC555 timer is configured as an astable multivibrator. It generates a continuous square wave output.
2. Piezoelectric Sensor:
   • The piezoelectric sensor is used to detect vibrations. It produces a voltage when subjected to mechanical vibrations.
3. Resistor (R1):
   • R1 is connected between the positive voltage rail and the discharge pin (pin 7) of the IC555. It is used for biasing the IC.
4. Resistor (R2):
   • R2 is connected between the discharge pin (pin 7) and the threshold pin (pin 6) of the IC555. It is used for discharge.
5. Capacitor (C1):
   • C1 is connected between the threshold pin (pin 6) and the discharge pin (pin 7) of the IC555. It is used for timing the circuit.
6. Resistor (R3):
   • R3 is connected between the threshold pin (pin 6) and the control voltage pin (pin 5) of the IC555. It is used for sensitivity adjustment.
7. Diode (D1):
   • D1 is connected between the relay coil and the positive voltage rail. It is used to protect the IC from reverse voltage generated when the relay coil is turned off.
8. Relay Module:
   • A relay module is used to control the buzzer or other alarm device. The IC555 activates the relay, allowing it to switch the alarm on and off.