Earthquake Alarm Using BT136 and Piezoelectric SensorThis earthquake alarm circuit is designed to detect vibrations and trigger an alert using a BT136 triac. Initially, a synchronous motor coil was used to generate an AC signal when an Odia magnet was placed inside it, turning the circuit on. Later, a piezoelectric sensor replaced the coil to directly detect impacts.
Working Principle:
A buzzer and an LED are connected to the T2 terminal of the BT136 triac.
A push switch is placed between T1 and T2 to manually reset the circuit.
The gate pin of the triac is connected to the motor coil (or piezoelectric sensor).
When the sensor experiences a vibration, it generates a small AC voltage that triggers the triac, activating the buzzer and LED.
The circuit remains latched until the push switch is pressed to reset it.
This setup ensures immediate detection of seismic activity, making it useful as a simple and effective earthquake alarm
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