Installed the TSSP and 'calibrated' the IR TX LEDS with a 500 ohm pot to get a useful 1' worth of reflected triggering. Should capture folks passing thru a 32" door ok.
I think I can get the TSOP version to work but the 'calibration' would be the gap between the .5mSec, 38Khz modulated pulses. I tried with no gap....range was like 4" or so. An 8ms gap and it was hypersensitive to all kinds of distant reflections. So somewhere inside there is a balance. I may fool around with it if I get some time. Looks like the calibration will have to be pushbutton based or via a pot/adc combo to alter the pulse gaps via the uC. Of course, once the TSOP doesn't see a pulse it goes super sensitive. That prob. means I'd have to feed it a 'calibration' pulse every couple ms to keep it from going hypersensitive. That requires an additional TX LED to throttle the rcvr.