You're right Russlk, it's no data sheet, it's more like a brochure...if even that much. :roll:
Anyway, I used a logic pen to watch the clock and two output pins while it was pointed at a wall. The clock was low with short, high pulses happening as the sonar clicked away at ~3Hz. I used 10MOhm pull-down resistors on the outputs and got an almost identical signal, except the rising pulses were much shorter. So already, the sensor isn't matching the "data sheet." Pointing it at empty space had no change.
I programmed an AVR controller, to record the sensor state on each clock pulse and display a red/green LED for misses/hits. The controller always reads "miss" matter were it's pointed, so these output pulses clearly don't match the clock.
Geez, if there's one thing I hate more than a broken device, it's a working one that's poorly documented. :x Lame! Lame! Lame!!