I have a working set-up to detect beam breaks using an IR LED, modulated at 36kHz, and a TSOP receiver connected to a comparator. It outputs the count via Arduino. The range is about the width of a door, say two meters maximum.
The transmitter and receiver are on a separate breadboards. This has its disadvantages, such as two sets of batteries.
Is there a way to reflect the IR LED off a reflector and having the TSOP receiver on the same breadboard as the LED? Perhaps behind it? The German term 'lichtschranke' seems to be what I vaguely have in mind, but I don't speak German and can't find it in English.
Does anyone have suggestions on how to modify my current set-up or can anyone point me to some schematics?
I am guessing something will need to be done in order to maintain a straight or angled beam and not have it reflected back all over the place.
How can I mount an IR emitter and receiver on the same circuit board to detect a reflection instead of a straight beam?