Hi All,
Does someone know the maximum number of nodes I can put on the same network ?
I would like to use about 30 nodes.
Is it possible ?
Thanks,
Dror
Yes it's possible - up to 255 nodes. You can modify/customize the RFM69 library to make the address space larger if you need more than 255 nodes, like adding a byte to TO/FROM address bytes, that will allow 65536 nodes.
But the more nodes you add the more RF traffic you will have. The RF spectrum is shared so you will need to be smart in your code not to flood the medium with too much traffic. So for simple things like having many sensor nodes that periodically send sensor information (like every 5 or 10 seconds or whatever) you should be able to use a very large number of nodes.
Either way, the RFM69 library is listening for a clear channel before it sends using the digital RSSI feature of RFM69. So it will only send when it senses there is no RF traffic and the channel is "free to talk".
Thank you for the detailed answer
255 is more then enough...