Industrial Machine Vibration Detection, Ready Kit, 100% Tested


Industrial Machine Vibration Detection circuit is presented here is based on the readily available vibration sensor also called piezoelectric sensor and comparator IC LM393. The Vibration sensor is used as the vibration detector while IC LM393 used as comparator. In the absence of vibration, no vibrations detect on the piezoelectric sensor. As a result piezoelectric sensor stop conducting and LED stays off. However, when vibrations detect on the piezoelectric sensor, piezoelectric sensor starts conducting and LED glows.

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Complete working video can be seen from

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Application of the circuit:

Most of the vibration sensor based circuits available in market use one or another kind of piezoelectric sensor which increases the cost and also require complicated circuitry around it. But this piezoelectric sensor based circuit uses readily available piezoelectric crystal as vibration detector. The functioning of this Industrial Machine Vibration Detection circuit is to detect vibration and automatically activate the LED in presence of vibration. LED glows continuously indicating the presence of vibration till vibration stops.

Why this particular circuit:

Piezoelectric sensor used here as a vibration detector. The circuit operates normally over a DC voltage of 5V which can be obtained by DC supply cable.

Explained working of circuit:

The basic idea behind the circuit operation is to turn ON LED in presence of vibration. The piezoelectric sensor  is needed for this purpose. Vibration sensor is piezoelectric device as it converts vibrations to electric energy. Here, Industrial Machine Vibration Detection circuit works as vibration detector while piezoelectric sensor working as vibration sensor that glows LED. IC LM393 is used as comparator. Vibration sensor output is connected as input to comparator.  Pin no. 4 of LM393 is pulled towards ground. In normal condition, no vibration detected and LED stays off. Now consider second scenario when vibration detects, the LED glows in the presence of vibration.

How to build:

First of all read the given manual thoroughly and study the circuit given in the figure. Also have look at PCB and components supplied along with the kit. Each component has to be soldered in its position on PCB.

Identification of resistors is done by color coding. The color band on each resistor corresponds to its exact value.

There are different methods in which values are defined on capacitors. But usually values are specified numerically on them.

Can you make out the whole working of circuit and are you able to identify each component separately as to where each of them has to be placed?

If yes only then proceed further to actually mounting and soldering the parts.

Not ICs but their sockets are to be soldered on PCB. This is to make mounting and dismounting of ICs easy while troubleshooting.

Start from left most corner of PCB and solder the components one by one on their correct position on PCB.

Before soldering any component see that you have placed it at its right position and with correct polarity. Give due attention to diodes and electrolytic capacitors as they are polarity dependent.

Do the soldering of other components in the same way while keeping in mind that components with long and sensitive leads like capacitors and transistors are soldered last.

Testing the kit:

After assembling and soldering of components on PCB, connect external DC power source of 5V.

For testing purpose vibration applied to vibration sensor. LED glows in this case.

Now set the desired intensity at which you want detection of vibration. This can be done by changing the resistive value of R2 variable resistor.

Install the unit at ceiling of room.

ICs used here:

The only IC used here is LM393

It is dual differential comparator IC.

This 8 pin IC is popular and commonly used IC

Part List


U1               – LM393

Base            – 8 pin

Resistors(all ¼ watt +/-5% carbon unless stated otherwise)

R2               – 10k Ohm(variable)

R3               – 1k Ohm

R4               – 1k Ohm

R5               – 10k Ohm

R6               – 10k Ohm

Capacitor C1               – 1uF


D4:              – Vibration Sensor

D1:              – Red LED

D2:              – Green LED

5 V USB Cable