Thanks Mr RB, Mr Al.
Just to clarify, the die will not be subject to rolling motions. The most movement it will experience is in the spectators hands, while they are choosing which number/colored face to place on top. Once they've made that decision, the die will be either on a table surface, covered from view or, remain in the hands, such that the orientation does not change.
I had forgotten the IIC single bit transfers. Although time is not critical in this application, detecting and reporting the orientation within a few seconds is fine.
As an aside, I've found a very small transmitter for this project. The two choices seem to be around AM transmitter with a super regenerative receiver. The other is ASK modulated, both at a data rate of ~3k. Is there any advantage of AM vs ASK in this case? In particular, I'm worried about noise (if I recall correctly, super regen recovers are pretty sensitive but largely at e expense of selectivity). I may be totally off base here so would appreciate your comments.
Thank
Nitrous