Okay, that makes a lot of sense. Timings are not at all critical, so it should be a cinch. And the available power already is 3.3 volts DC, no issue there either. I'll try the 32kHz approach. Its just that the 'componentless' version in the URL looked too fascinating.

Quote Originally Posted by Bruce View Post

If it's operating from the camera battery, which it appears to be, it definitely is battery powered...
Absolutely! I meant its own battery. The port control pins are pulled high by 47K resistors internal to the camera, and these are the pins my circuit would have to be powered by.

Thanks again!

Anand