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

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

Hung Bui — Wed, 07 Oct 2015 07:49:36 GMT

@ mike: There is no ROM on the nRF24L01, configuration is stored in RAM. So if the chip is reset, it will lose configuration, and you always need an MCU to control and read the data out. If you re thinking of a standalone solution, you can have a look at the nRF24LE1 chip, it's the combination of a 8051 MCU and a nRF24L01+.

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

mikebuzz — Wed, 07 Oct 2015 01:33:31 GMT

Does the nRF24l01 store the programming info like channel and address etc. ? I assum this is stored in EEprom onboard the chip ? I want to have stand alone RX that are fixed programming and ch selection / address , these will be remote and need to read the data when their address/ch is selected

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

Hung Bui — Thu, 24 Sep 2015 02:57:35 GMT

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.

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

mikebuzz — Wed, 23 Sep 2015 05:52:40 GMT

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

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

Hung Bui — Mon, 21 Sep 2015 12:32:39 GMT

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.