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Measure RPM with an IR sensor and Arduino

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Measure RPM with an IR sensor and Arduino

Arduino TeamFebruary 27th, 2018

When dealing with robotics and other electronics projects, it can be important to know how many revolutions a motor is making. From here, you can infer the distance that your device has traveled, or any number of other important variables.

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If you’d like to get started with this type of sensing, this electronoobs tutorial will show you how to get things hooked up using an Arduino and a computer, along with an oscilloscope to verify measurements up to 10,000 RPM.

In his setup, an IR emitter/receiver bounces light off a spinning object. When light reflects back, it opens the circuit, causing the output to be grounded via a pulldown resistor, telling you that a revolution has been made. The 3D-printed device also features an OLED screen.

To emit infrared light we need a IR LED and to detect it a IR sensible transistor. Usually you could find those as a one unique module. To amplify the signal I’ve used the LM324 amplifier. You will also need a 100 ohm resistor and a 4.7k ohm one. To supply the system we will need a basic 9V battery and connector, an Arduino Nano, and an OLED screen. The case is 3D printed…

You can find more details on the build process here, as well as a demo of the tachometer below!

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Written by Quad Oner

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