Measure RPM w. DIY Arduino Optical Tachometer using Infrared LED & Phototransistor

Measure RPM w. DIY Arduino Optical Tachometer using Infrared LED & Phototransistor
  MakerCK Studio
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How to build an Arduino optical tachometer to measure RPMs using an IR LED and phototransistor. I've put a download link on my website under the Arduino optical tachometer blog entry. You can download the Arduino sketch there.  ... 

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Diy  


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