I thought you just wanted a beam break detector, all on or all off. You found a sensor that will demodulate your signal and turn it into an on or off output, as you need. Why do you need to pulse the transmitted signal, with the pulses not really being data?

What i really need is beam detection not really beam break but essentially the same thing

I found that one sensor that detects continuous signals but the 56khz version is not available
I need both 38khz and 56khz
the 56khz version is 9 weeks away in china.

 

I thought you just wanted a beam break detector, all on or all off. You found a sensor that will demodulate your signal and turn it into an on or off output, as you need. Why do you need to pulse the transmitted signal, with the pulses not really being data?

If I understand things correctly, the sensor he has filters out an unmodulated signal as being spurious.

 

If I understand things correctly, the sensor he has filters out an unmodulated signal as being spurious.

correct

 

Well of course it has to be modulated at the carrier frequency but does it also have to pulse? I thought he had found a sensor that will lock onto a continuous carrier, holding a steady output if the carrier is detected.

 

Well of course it has to be modulated at the carrier frequency but does it also have to pulse? I thought he had found a sensor that will lock onto a continuous carrier, holding a steady output if the carrier is detected.

i did but i can only get the 38khz version. The o56k version is nine weeks away in china

 

Well of course it has to be modulated at the carrier frequency but does it also have to pulse? I thought he had found a sensor that will lock onto a continuous carrier, holding a steady output if the carrier is detected.

If there aren't any pulses then there is only an unmodulated carrier (since the modulation scheme is on-off keying).