IR BEAM BREAK SENSOR

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spike1947
Posts: 10
Joined: Wed Feb 03, 2016 5:56 pm

IR BEAM BREAK SENSOR

Post by spike1947 » Tue Dec 15, 2020 3:29 pm

Hi
Am wanting to make a "IR BEAM BREAK SENSOR" as per attached schematic! .
Also I would like to add some sort of “Time Delay” to the schematic , so when the beam breaks, and the relay gets activated , would like the relay to stay activated for a couple of seconds after the object has passed through the beam !.
Anyone got any idea's has to how I can achieve that ? .

cheers
Spike
Attachments
IR BREAK LIGHT SENSOR  14.12.20      REV 0.png
IR BREAK LIGHT SENSOR 14.12.20 REV 0.png (7.4 KiB) Viewed 13811 times

spike1947
Posts: 10
Joined: Wed Feb 03, 2016 5:56 pm

Re: IR BEAM BREAK SENSOR

Post by spike1947 » Tue Dec 15, 2020 10:09 pm

Would this do .

cheers
Spike
Attachments
IR BREAK LIGHT SENSOR  15.12.20      REV 1.png
IR BREAK LIGHT SENSOR 15.12.20 REV 1.png (8.66 KiB) Viewed 13809 times

David
Posts: 219
Joined: Sun Oct 04, 2015 6:18 pm

Re: IR BEAM BREAK SENSOR

Post by David » Wed Dec 16, 2020 11:53 am

The 555 chip is definitely one of the most well used and versatile devices going.
I am not sure that your modification will be quite right for the use you mention, but just Google something like "555 monostable" and you should be able to get your circuit to give a desired delay. Experiment with the many circuit diagrams and you should be able to make a monostable do just what is needed.

BTW, this site has a lot of information on ICs - just keep looking!

Have a look in a good bookshop for experimental electronic circuit books - that might be a good Christmas present!

spike1947
Posts: 10
Joined: Wed Feb 03, 2016 5:56 pm

Re: IR BEAM BREAK SENSOR

Post by spike1947 » Wed Dec 16, 2020 7:04 pm

Hi
Have done a revised schematic as attached ! , to give me 2 sec delay.

cheers
Spike
Attachments
IR BREAK LIGHT SENSOR  16.12.20      REV 3.png
IR BREAK LIGHT SENSOR 16.12.20 REV 3.png (8.56 KiB) Viewed 13793 times

spike1947
Posts: 10
Joined: Wed Feb 03, 2016 5:56 pm

Re: IR BEAM BREAK SENSOR

Post by spike1947 » Thu Dec 17, 2020 10:40 am

Schematic is by " dodgydave"

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