Measure RPM – DIY portable digital tachometer

This Instructable will show you how to make a Portable Digital Optical Tachometer using an Arduino Uno. This project is inspired from This instructable and is an enhanced version of it with an LCD display and a modified code. Instead of a slotted sensor , it has a reflection based sensor. So : 1. You don't have to worry about the thickness of the rotor 2. The number of blades won't change your readings 3. I ...

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