I completed this project. To avoid false triggering, I pulsed the transmitter at 38kHz since the receiver is designed to 'see' that frequency. For the IR receiver I used this. For the transmitter I used this. The emitter is driven through a transistor who's 38kHz base signal is derived from a 555 timer. I had problems with getting an accurate frequency with the 555; it was very fussy about the external timing capacitor used. I was able to get a stable frequency using a high precision, low value capacitor. If I were to do it again I would use an Attiny85. No external components (except for decoupling) are needed, very stable, and it costs only about $.40 more than a 555. You would need to learn how to load code to it but that's no big deal. - Scotty