Vibration Detector Circuit

Posted on Feb 6, 2014

The sensors are a thin strip of piezoelectric material with a rivet in the end acting as a weight. When there is a vibration, the weight moves, stressing the piezo material that produces a spike in voltage. This voltage that is created may be up to 90V. We are going to connect this vibration sensor to an arduino which can read and detect these vol

Vibration Detector Circuit
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tages that the sensor creates when there is vibration. With the resistance which an analog terminal of an arduino offers, these voltages of up to 90V will be brought to safe levels that will not harm the arduino board. When the arduino detects vibration, the LED connected to it will light up for a second and then turn off with each vibration above a certain threshold value. This circuit is used often for impact sensing or as a flexible switch. If the piezo sensor is flexed, a large voltage will be created which can switch on a transistor, SCR, or any other type of switching device. The piezo vibration sensor is from the company MEAS. It can be obtained from a number of online retailers for a very low price (under $5). Follow this link to the piezo sensor offered by Sparkfun- Sparkfun- Piezo vibration sensor. We will connect the 2 pins to analog terminal A0 and A1 of the arduino board. We will then in our code set one to LOW, representing ground, while the other pin will be the sense pin, which will sense for any vibrations that are made in the sensor`s vicinity. The piezo sensor works very well with the arduino. It 2 pins simply go into analog terminal A0 and A1 of the arduino. A0 will be configured to be ground and A1 will be the positive sense pin of the vibration sensor. This pin will detect whether there is any vibration or not. The LED`s positive pin (the anode) will go into digital pin 13 of the arduino and the...

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