- Sun Feb 21, 2016 11:26 am
Duplicate frequencies are only a problem if a transmitter is continuously transmitting. For sensor data or event notification, only a very short message containing sender ID and the necessary data is needed. Furthermore, having separate frequencies does not guarantee communication. Radio is inherently unreliable.
Remote sensors for home weather stations use a single frequency and transmit data every minute or so, on staggered schedules. If there is an occasional overlap between two transmissions, you lose a couple of readings, but who cares?
For more reliable single frequency transmissions, you can use bidirectional modules (transceivers) with send/acknowledge on each end. NRF24L01 modules are very cheap and can do this, but the programming is more complicated.