how to construct rfid network

[sivasingaraj]

I have worked with nrf24l01+ devices. In my project include single PRX with 100 PTX. Objective of this project is all PTX send packet to one common PRX device & PRX send ack to all PTX after get the packet. how can i create one rfid network between them. can i use tdma based solution.

thanks &regards sivasingaraj s

[Håkon Alseth]

Hi,

Can you please clarify? Do you want the PRX to send a packet to all 100 PTX after receiving payload from one PTX?

Best regards Håkon

[sivasingaraj]

hi, gud morning ,, thanks for your response

I want to send ack to one particular PTX from PRX.

I have 1,2,3...... upto 100 PTX devices. if PTX1 & PTX2 sends payload to PRX at a same time how can PRX send ack to one particular PTX. if all 100 PTX send payload to PRX at a same time how can PRX send Ack to one correct PTX.

[Bastiaan]

hi, gud morning ,, thanks for your response

I want to send ack to one particular PTX from PRX.

I have 1,2,3...... upto 100 PTX devices. if PTX1 & PTX2 sends payload to PRX at a same time how can PRX send ack to one particular PTX. if all 100 PTX send payload to PRX at a same time how can PRX send Ack to one correct PTX.

[Guest]

hi, gud morning ,, thanks for your response

I want to send ack to one particular PTX from PRX.

I have 1,2,3...... upto 100 PTX devices. if PTX1 & PTX2 sends payload to PRX at a same time how can PRX send ack to one particular PTX. if all 100 PTX send payload to PRX at a same time how can PRX send Ack to one correct PTX.

[Håkon Alseth]

Hi,

ACKing is done by default, if you have not explicitly turned it off. You can also attach a payload to the ACK. Please see chapter 9 for details on which bits need to be set (see the FEATURE register). Note that this must then be set equal on both PRX and PTX.

If two or more devices send at the exact same time, there will be an on-air collision, and most likely, no packets will be received. You will have to make some sort of protocol in firmware to handle this.

Best regards Håkon