Hi all,
I want to design the missing beam detection circuit with IR Led and IR diode.
tell me about some example circuit?
When I am designing what are the factors that should I consider.

Thanks....

 

For circuits Google: beam break circuit

Lots of options out there.

Considerations:

The distance between the LED and IR diode.
Beam-width/angle of the LED, and detection angle of the diode.
Ambient light/heat sources that can be detected by the diode circuit.

Ken

 

I made one of these in my circuits class. I was using an astable 555 timer to generate the IR pulse a monostable 555 to detect the missing pulse. I had some issues with the triggering of the monostable 555. If you take this approach I would look into the triggering of the monostable 555.

 

Hi all,
I want to design the missing beam detection circuit with IR Led and IR diode.
tell me about some example circuit?
When I am designing what are the factors that should I consider.

Thanks....

How much range? Do you want it to work outdoors in bright sun?

I needed one that would work over a range of 3m, outdoors. I used a standard TV remote control IR receiver module (Sharp GP1U58Y) as the detector. I build a transmitter which modulated a IR Led at the carrier frequency (40kHz) to match the receiver. A momentary interruption of the beam causes the output of the IR receiver to switch low, and then high again.