Vibration Sensor Alarm
The idea behind this compact and economical Vibration Sensor Alarm is very simple. It uses a cheap and cheerful vibration sensor to drive a piezo-sounder. As can be seen in the circuit diagram, it is wired around one tiny microcontroller PIC12F675. Batteries are suitable for the power supply, because the circuit only takes less than 5mA in idle state. Four Ni-MH cells (1.2V x 4 = 4.8V) and a charger are therefore perfect for the power bank. When making your choice you should keep in mind that rechargeable types are affordable, and better for the environment.
Schematic of the Vibration Alarm with PIC12F675 Circuit
As stated earlier, you can use 4.8VDC available from a Ni-MH battery bank to power the whole system. Here a power supply circuit is added for your total convenience, with the help of which you can use 4 x Rechargeable Cells (4.8V) or 4 x Dry cells (6.0V) or any standard 9-12VDC adaptor to energize the system.
The Vibration Sensor
The sensor is made up of a small spring mechanism, which makes the contact ON when the applied vibration force is at above a certain threshold. It has two legs coming out of it. Normally the two terminal are insulated by a resistance value more than 10MΩ. When someone applies vibrating force (by movement or vibration) on the switch, spring inside the switch vibrates and makes a momentary short circuit between the two terminals. Since this sensor is very delicate, take extreme care while handling and soldering.
Lab Note
Original part number and name of the vibration sensor is “SW-18020P / Vibration Switch Sensor ”. Cost of the sensor is near 1$ only!
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