I am mulling over possible solutions to a project that I have been thinking about.
I need to have reliable bi-directional radio communication between two MCUs. The link should be reliable at a distance of 500m line of sight, and should achieve an end to end speed of at least 4,800bps and preferably 9,600bps. Cost is of a concern (less than £20 in single unit qty)
I was thinking of zigbee or 801.15.4. I would like to here of people's experiences with various modules.
As the communication needs to be bi-directional and the data is both directions is likely to be pretty constant I would like to know how the system copes with this, and what sort of latencies I can expect between the data transmission from one MCU to it being received by the other as this is to form the basis of a real time control system.
Can any one help shed some light?