NRF24le1 max no. of IR nodes?

[Matthews]

Hi friends,

I am doing a project in NRF24le1 using RF communication with multiple nodes with a host using star topology.

Could you suggest a Protocol that supports connecting upto 100 nodes with a single host

[ovrebekk]

Hi

We don't really have any out of the box-protocols well suited for doing huge star networks, you would probably need to do something proprietary on top of the ESB protocol.

If you have a single host talking to multiple nodes then you can have the host interrogate one node at the time, and differentiate the nodes by using unique RF addresses.

If you use the ACK payload mechanism you can have the nodes prepare some data for the host in an ACK payload, and as soon as the host sends a packet to the node the ACK payload will be sent in return.

The simplest implementation would have the nodes in RX mode constantly, waiting for the host to send a packet, but this wouldn't be very power efficient. If you need a more efficient implementation you can have the host interrogate the nodes at a fixed interval, allowing the nodes to sleep in between packets.

Best regards
Torbjørn

[Matthews]

Thank u torbjorn,

But as per ESD protocol a maximum of 8 nodes can only be connected at a frequency channel. So i am thinking to design like a 10 or 12 node group in different different frequency channel?

Is it reliable if i switch the frequency channel of host periodically and search for response from nodes in a group at a particular frequency

thanks and regards

Matthews