Author Topic: Laser break detection for high speed passing  (Read 1819 times)

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Offline LiveforlivingTopic starter

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Laser break detection for high speed passing
« on: October 23, 2015, 01:17:06 PM »
So, I'm working on this project where a laser and a photoresistor are connected to an Arduino.  The goal is when a 2inch board swings through, it breaks the laser beam, which triggers an LED to light up.  The challenge is that the board is going to be traveling at 30-50mph.

Is a photoresistor able to detect the break in that quick of a moment?  Does anyone have a better idea on what to use that will work better in detecting the 2inch board passing through?


Offline FIFO

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Re: Laser break detection for high speed passing
« Reply #1 on: October 23, 2015, 01:40:55 PM »
Phototransistors react far more quickly than CdS cells (photoresistors), and I have had success using them in reflective proximity detectors.

This thread should prove to be useful to you, specifically the reply posted by Soeren:


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