I want to send data wirelessly up to 30cm (12in) to a PIC chip.
I will not have a line of sight so it cant be Infra Red.
The emitter needs to be small and needs to run on very little power and will only be powered when it needs to transmit. (this will be a 10us pulse, up to 50 times per second)
I am only sending 1 or 0. (either transmitting, or not) and it is the leading edge which I am using as the signal.
I need to be able to run several of these systems in tandem without them interfearing with eachother.
I am not sure what kind of technology to use,
would ultrasonics be suitable?
Radio?
Or one of the newer technologies like bluetooth?
I would really appreciate Pros and Cons of these technologies, or if there is another which is suitable please mention that.
If anyone has any good websites on the subject I would be very grateful.
Many thanks in advance
John