How to make a vibration sensor on an lm358 chip

car vibration sensor

While analyzing the car alarm system, I found an interesting sensor made on a piezoelectric element to which a spring is connected.As you know, if you compress the piezoelectric emitter plates, there will be a voltage on its terminals.If a spring is connected to the radiator, the piezoelectric element will generate voltage when the spring vibrates.This voltage is then supplied to the chip.

I decided to repeat a similar vibration sensor and I did it perfectly.A spring was connected to the piezoelectric emitter.During vibration, the voltage is applied to the LM358 chip.A signal amplifier is assembled on the first operational amplifier, and a comparator is assembled on the second.With the resistor R3, we adjust the sensitivity.

The sensitivity of the device is such that it picks up the slightest tapping on the table.At the same time, the LED will shine as an alarm

Instead of the LED, put the key on the transistor and connect a relay or other actuator.Install the sensor on a protected object and your property will be safe

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