nRF24L01 used in a star system ( or 1 TX and multiple RX )

[mikebuzz]

Motor mic flow chart.pdf

The PDF is a basic flow chart of the system we are looking to implement, this would be X4 times so 4 TX plus RX's

I know this can be done by reading other questions my ? is

1. how many RX can be used with ONE TX ?
2. my need is a one way system ( RX only for multiple RX )
3. if there are say 3-6 TX what issues do I need to pay attention to ?

thanks MikeBuzz

this is for a RC type remote control system , we ultimately need 48 ch's total , I am not sure how many Ch's the nRF24l01 can do ?

[Hung Bui]

Hi mikebuzz,

The nRF24L01P can do 126 channels, each 1 MHz.

Yes, you can one TX and multiple RX.

If the RXs listen on different channel, you can simply switch between the channels on the TX.

Note that the PRXs doesn't need to be on different channels. They can be on all same channel, since each of them can have different address so they can detect the packet for them.

If you have multiple TX, you would need to face interference when they transmit at the same time. If you don't have any ACK (just one way) then it's hard to detect interference.

You would need to have a scheme for the PTXs to avoid transmitting on same channel at the same time.

To be able to cover 200m (line of sight), you may want to use 250kbps data rate.

[mikebuzz]

Thanks Hung , how do I find a programmer for hire these devices ? is there a forum or place to find programming people ?

[Hung Bui]

Well, maybe it's not the place to ask here. Because this forum is more on solving technical issue with our product, not for discussion and hiring. I would suggest you to check some design houses around, they maybe able to help you on this.