If I have a single Boolean value that I wish to transmit wirelessly over a relatively short distance (assume <2m) then what of the many possible options would be the most practical.
To define what I mean my practical, it is some combination of:
- low cost
- low power
- environmentally robust
- high data integrity
- high reliability
- low bulk/weight
All of which apply equally to both the transmitter and receiver. I assume there will be some tradeoff between these
Other concerns that might impact the answers, but are of less interest to me:
- The transmission may be repeated, but not at a high frequency (assume <2Hz), although there is no penalty for higher frequency capability.
- The transmission need only be unidirectional, although bi-directionality might be a bonus.
- The transmission does not have any security concerns, although some level of security might be a bonus.
- There is only one transmitter/receiver pair in the local area, although the ability to operate with multiple unique transmissions in the same area might be a bonus.
- The transmission is one-to-one between transmitter and receiver, although the ability to transmit to many receivers, or from many transmitters, might be a bonus.
- The solution should be off-the-shelf to a certain extent, although if bespoke (or high volume) options significantly improve the solution in some way then I would be interested to hear about them.
- The solution should ideally be legal/unlicensed in most countries, but I'd be interested in what illegal or licensed options could be possible too.
I don't have a specific application in mind, I'm more interested as a theoretical exercise.
Note that there is a related question here, but currently unanswered and with slightly different criteria.