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Topic: Simple IR barrier sensor for arduino (Read 2 times) previous topic - next topic



I would like to build a simple IR barrier
sensor and wondered how to wire it.

Any simple ciruits out there?



Aug 15, 2011, 01:27 am Last Edit: Aug 15, 2011, 01:32 am by asuryan Reason: 1
Thank you for your reply!

I would like to avoid environmental interferences so
how to modulate a IR signal?

What I want to do is:
1. Understand how to build a sensor like this
in general for future projects.

2. Maybe I want to build a machine to sort
coins so I would like to detect the size of
a coin and if a coin has reached a physical
place in the machine.

I have this IR phototransistor (BP 103B-2)

And this IR LED (LD 274-3):

I also have a BPW 42 phototransistor As well As a SFH 409 IR LED.

Thank you very much!! :)


Links work for me, opens into pdf docs.



Aug 15, 2011, 09:45 am Last Edit: Aug 15, 2011, 10:14 am by asuryan Reason: 1
Sorry if the links didnt work for you. Here are some better ones of the
components I have here:

My phototransistors:


1. Is it possible to build a barrier sensor just with these components without external
ICs etc. (Of course resistors)?

2. Is it possible to modulate a beam just with eg. PWM of the arduino?
Could someone provide a very small code example just as a hint? It would be nice to read
the state of the IR barrier sensor as simple as this little sample:

Code: [Select]
if(digitalRead(IRSensorPin) == LOW){

3.  The link you provided needed some other components too. Is it because the serial data
transfer (btw thats really cool... ;))? I just want to detect if the beam is disconnected
because of an object so can it be simpler?

Thanks you so much! :)


Thanks for your input and help.

I will have closer look on the modules which allready send at
a certain modulation. Thanks for your advice! :)

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