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Make your own Contactless RPM Meter [Project]
posted September 24 2014 18:15.15 by Giorgos Lazaridis

I just stumbled upon this instructable when i was searching for rpm meter ideas. Actually i had one but it used visible light. This one uses IR instead. I will stick to the visible light because i find it more practical if you see where i aim. But the main concept is the same. The light is reflected to the reflective surface of the white tape in contrast to the non-reflective color of the shaft. The circuit then measures the "pulses" of light reflected to calculate the RPM.

Here is the link of the instructable

And here is the video

[Link: electro18]

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  • At 12 August 2015, 12:44:19 user Madhaviul wrote:   [reply @ Madhaviul]
    • I also built a tachometer using arduino uno something similar to this one http://circuitdigest.com/microcontroller-projects/tachometer-using-arduino

      I am not sure from the description that how difficult it is from one that you have built. I am looking for to improve it.

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