IR curtain

Thread Starter

grcshekar

Joined Jan 8, 2020
13
Hi Experts There !

Can you please help me with circuit and components for a IR curtain which would cover 2.5 feet of width and 2.75 feet of height. When beam is intercepted it should either send a HIGH or LOW signal to Arduino
 
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What kind of resolution are you aiming for? In other words, what is the size of the smallest device you want to detect. That will define what you will need.
Regards,
Keith
 
You are describing an industrial light curtain, used for protecting operators. They are available in many sizes and a lot of variations. Normally they would connect to industrial automation system safety controllers, not an arduino. If this is a safety application no arduino hardware could possibly gain acceptance.
 

Bernard

Joined Aug 7, 2008
5,332
Some ramblings:
Keep beam width narrower than spaces , may need short focus lens on Tx., conical concentrator on Rx. Non modulated is simpler.
Can the beams be horizontal, less apt to collect trash?
 
OK, the systems that I have used were to keep machines from running when hands or fingers were near moving parts. The TS has given no clue as to what this is for, or how important reliability and performance would be.
For home fabrication and applications I suggest small cheap lasers and phototransistors as detectors. Narrow beam LEDs are not available to most folks, and the logic to make the wider beam ones work gets large. With LEDs the beams need to come on in sequence and the opposite detector needs to be checked only at that time. And they do it a few times per second. Lasers could all flash at the same time, a few times per second, and all of the sensors could be checked at once. Much simpler.
 

Thread Starter

grcshekar

Joined Jan 8, 2020
13
OK, the systems that I have used were to keep machines from running when hands or fingers were near moving parts. The TS has given no clue as to what this is for, or how important reliability and performance would be.
For home fabrication and applications I suggest small cheap lasers and phototransistors as detectors. Narrow beam LEDs are not available to most folks, and the logic to make the wider beam ones work gets large. With LEDs the beams need to come on in sequence and the opposite detector needs to be checked only at that time. And they do it a few times per second. Lasers could all flash at the same time, a few times per second, and all of the sensors could be checked at once. Much simpler.
Yes but how to do this
 
Can be horizontal, but I need full details including components and circuit
What is your electronic knowledge level and experience? I doubt whether anyone on the forum is prepared to invest their precious time in designing and developing a complete custom system for you, especially when you can by a ready built and tested unit. If you insist on building your own, I would suggest you start doing some research on the subject so that you can design it yourself.
Regards,
Keith
 

dendad

Joined Feb 20, 2016
3,149
Usually, the best way to get help is to post your attempts at the project and folks here will suggest changes as required.
So, do some research and draw up circuits than ask again. If you are not wanting to do a bit of work, I reckon you need to go and buy an over the counter one.
Most of the time, this forum is to help you learn stuff, not do it for you.
 
The objects passing through "the beam" (I expect them to be "many beams"), are moving along the bottom line or could they be passing with they lower end at any height?

If you prepare a sketch showing all the possible bodies passing through, it could help you to have some ideas of your own. Otherwise, your are requiring a full design service and that could cost dearly.

Curious: are you usually mixing cm with inches? Do you recognize the difference? I work with both types of units in my daily job but never mix them. :oops:
 
What is your electronic knowledge level and experience? I doubt whether anyone on the forum is prepared to invest their precious time in designing and developing a complete custom system for you, especially when you can by a ready built and tested unit. If you insist on building your own, I would suggest you start doing some research on the subject so that you can design it yourself.
Regards,
Keith
A good light curtain is not simple, no matter what. How far apart can the light beams be? That is what the question about resolution means. Will you be able to produce the mounting arrangement to accurately point each light source at the detector it is going to work with? Is the purpose of this system to provide safety by stopping a machine when it is triggered, or is it for security, to send an alarm when something breaks a beam? The application matters a whole lot. We need to understand a lot more about this potential application.
 
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Reloadron

Joined Jan 15, 2015
4,676
Yes am sure
Then here is what I suggest you do. Purely for a home project and nothing industrial where life or limb may figure into things. I would go buy some of these or maybe some of these. All you need is a starter pack for a proof of concept and that takes care of the transmitter side. Then while you are at it buy some of these also so that takes care of the receiver end. Actually the plain sensors can also be bought so you don't need a few parts on the modules I linked. A Google of LASER Sensors or photo transistors should find some. I have played with some of those I linked to but have never really looked at the LASER dispersion over any distances so that is why I suggest buy a few and do a proof of concept. Get a few boards and drill mounting holes for the transmitters and receivers at precise intervals.

Again if this is for a home brew kitchen table project then fine but for anything industrial you can buy a LASER Light curtain designed for safety.

Ron
 
OK, so the system needs to trigger on a 1CM object. That means that beam spread could easily be a problem unless lasers are used. An interesting concept would be a laser and a whole bunch of mirrors so that one beam could cover a very large area. But aiming an invisible beam would be a huge problem.
 
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