I'm looking for a REALLY simple contactless method of providing a serial data stream between a sealed 'AVR' and external controller. I'm thinking in the 300-1200 baud type speeds. Needs to be < US$15 for the receiver components.
Options I've seen so far, FM receiver SIP unit - quite bulky, Nordic 2.4Ghz probably more complex than I need.
Any other leads / suggestions or an induction based solution?