Society of Robots - Robot Forum

Mechanics and Construction => Mechanics and Construction => Topic started by: Liveforliving on October 23, 2015, 01:17:06 PM

Title: Laser break detection for high speed passing
Post by: Liveforliving 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?

Thanks!

Title: Re: Laser break detection for high speed passing
Post by: FIFO 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:
http://www.societyofrobots.com/robotforum/index.php?topic=7331.0 (http://www.societyofrobots.com/robotforum/index.php?topic=7331.0)