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General Category => Digital discussion => Topic started by: kam on February 25, 2011, 20:23:22 PM

Title: Long Range (10mt) IR Beam Break Detector - Comment by justin [25 February 2011]
Post by: kam on February 25, 2011, 20:23:22 PM
Original comment at page: http://pcbheaven.com/circuitpages/Long_Range_IR_Beam_Break_Detector/index.php

Quote
# At 25 February 2011, 12:01:42 user justin wrote:
      Hi
      I am doing automatic room light controller with bidirectional.
      I will use 2 transmitter(TSAL6200) and 2 receiver(TSOP4838) at each side of the door.
      lets assume
      S1 is the first pair of transceiver
      S2 is the second pair.
      if S1 is obstructed before S2,mean people go in
      If S2 is obstructed before S1,mean people go out.

      MY question is will the 2 receiver wrongly received the signal from other transmitter?
      mean 1st receiver received signal from 2nd transmitter,etc


So, i have attached 2 files. The first file (2pairs.jpg) shows 2 pairs of transmitter-receiver. Usually (unless noted) LEDs have an angle of 24-25 degrees. So, if the beams overlap has to do with the distance between the transmitter and the receiver. Look at the attachment. In the green regions the beams will not overlap. But if you put the receivers in the blue region, the receivers will definitely have problems.

But here is another idea. You can use only one transmitter and 2 receivers.  Look at the second attachment. There is only one transmitter LED. But there are 2 receivers (the orange circles). If someone goes from left to right, then the left receiver will be actuated first.
Title: Re: Long Range (10mt) IR Beam Break Detector - Comment by justin [25 February 2011]
Post by: amos19ayers on May 20, 2011, 16:21:53 PM
Can you give a brief description of how you have done this?
Title: Re: Long Range (10mt) IR Beam Break Detector - Comment by justin [25 February 2011]
Post by: kam on May 20, 2011, 18:28:35 PM
which one you mean?
Title: Re: Long Range (10mt) IR Beam Break Detector - Comment by justin [25 February 2011]
Post by: annystephans on October 24, 2011, 13:37:45 PM
I want to know more about Long Range Break Detector.
Title: Re: Long Range (10mt) IR Beam Break Detector - Comment by justin [25 February 2011]
Post by: _pike on October 24, 2011, 18:29:50 PM
Hello and welcome to the forum!.Go here.....

http://pcbheaven.com/circuitpages/Long_Range_IR_Beam_Break_Detector/