I have a small AVR monted on a rotating fan.
I need serial communications between the AVR and a (non rotating ;) PC. Not necessarily both ways communication, the PC has to be able to send stuff to the AVR, the reverse is not important.
I've tried mounting a few IR LED's and phototransistors inside the motor of the fan, it's pretty dark in there, so I figured it might work w/o any modulation.
But I get some nasty noise problems... Most probably due to the rotation since there's not always a LED exactly straight above one of the phototransistors.
The application is cost sensitive... does anyone have a suggestion?
BTW debugging software on a rotating AVR is a pain in the a__!