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Required components: Here are the required components along with Amazon buying links at best prices.

Lets look at the required component and build it according to the Circuit diagram below. In this method we are using Arduino to build the tachometer by interfacing it with IR sensor to calculate the RPM to display the RPM on 16X2 LCD display module with I2C adapter. DIY Tachometer to Measure Accurate RPM using Arduino When the IR sensor module is powered on, IR transmitter emits IR rays and reaches to an object in front of it and few amount of IR rays are reflected back and according to the intensity of the received rays the IR receiver receives the IR rays and generate the voltage and outputs it through the OUT pin with the help of LM358 IC. IR transmitter LED looks same as normal LED but the IR rays emitted through it are not visible to human eyes, and IR receivers comes in the forms of photo diodes which are not same as normal Photo diodes as IR diodes receive only InfraRed rays.

Here we are using an IR sensor module which contains two IR LEDs, one is to emit the IR rays which is called IR Transmitter, and another IR LED which is also called as IR Photo Diode which acts as a IR rays receiver or IR sensor.

Infrared waves has wavelength longer than the visible light, so they are not visible to our human eyes. This DIY Tachometer is cheap and works with the principle of Infrared waves. The word tachometer has an origin in the Greek vocabulary, the prefix “Tacko” means speed or high speed and for its part, the suffix “Metron” is translated as measure. So, this is why I affirm that the tachometer is an instrument that measures speed.

The unit of measurement of the tachometer is the revolutions per minute (RPM), since you have to understand that revolutions mean turns, then it would be the number of turns that the element makes, for each minute.