nrf24l01+ multiceiver with three transmitters

RE: nrf24l01+ multiceiver with three transmitters

qiri — Mon, 27 Jul 2015 11:18:24 GMT

I have solved my problem!. It was: LSBissue I was writing tx adress as a: uint8_t adress[5] = {0xCD, CD, CD,CD,05}; It should be: adress[5] = {0x05, CD, CD,CD,CD}; nrf writes LSB as first. Fortunately it works!

RE: nrf24l01+ multiceiver with three transmitters

sid — Mon, 27 Jul 2015 05:38:05 GMT

I didn't get anywhere with this actually....

RE: nrf24l01+ multiceiver with three transmitters

qiri — Mon, 27 Jul 2015 01:28:07 GMT

I also have an identicall problem. Have you already solved it? I'm looking for any mistake in my code but can't find anything. Also receiver gets data from payload 0 and 1 but there is no communication on payload 2nd.

RE: nrf24l01+ multiceiver with three transmitters

sid — Tue, 17 Feb 2015 12:37:35 GMT

With respect to LSB/MSB byte addressing, I checked the way that SPI was transferring in data for command and data and it looks ok to me. Reading back out the RX_ADDR_P2 register on PRX confirms this is the case. I've uploaded the code here for your reference: github.com/.../rf24. I

PRX config:

RX_ADDR_P0:E7,E7,E7,E7,E7
RX_ADDR_P1:C2,C2,C2,C2,C2
RX_ADDR_P2:D3
RX_ADDR_P3:E4
RX_ADDR_P4:F5
RX_ADDR_P5:A6
RF_CH:00000010
EN_AA:00111111
EN_RXADDR:00111111
STATUS:00001110
CONFIG:00001011
RF_SETUP:00100000

PTX3 config:

TX_ADDR:C2,C2,C2,C2,D3
RX_ADDR_P0:C2,C2,C2,C2,D3
RF_CH:00000010
EN_AA:00111111
EN_RXADDR:00111111
STATUS:00001110
CONFIG:00001011
RF_SETUP:00100000
About to send!
> Message is lost ...

RE: nrf24l01+ multiceiver with three transmitters

sid — Tue, 17 Feb 2015 09:24:37 GMT

Sorry for the late response - I actually ended up buying an oscilloscope which I have been meaning to do for some time.

I checked VDD_PA and it does go up to 1.8 (anywhere from 1.84V-1.88V) right before transmission on PTX3.

I double checked PTX1 and PTX2 as well, and they are also going to up 1.8V before transmission.

So all is well with PTX3 sending. I will check your ideas around address LSB/MSB now.

RE: nrf24l01+ multiceiver with three transmitters

Asbjørn — Mon, 02 Feb 2015 16:38:14 GMT

Just to make sure, could you use and oscilloscope on the VDD_PA pin on the PTX3. This pin will go up to 1.8 V during transmission. So it should toggle up and down as you send packages if everything is working correctly with the board.

Make sure you enter the address the correct way. Is it possible that you are writing the with LSB and MSB switched? Then the PTX1 and PTX2 would still work as intended, but PTX3 would fail. Your line of thought seems to be correct. Could you read out the setting after as well to make sure that they are actually as expected.

RE: nrf24l01+ multiceiver with three transmitters

sid — Thu, 29 Jan 2015 04:15:29 GMT

Thanks for your response. Just tried this but unfortunately it did not work. Config listed below.

PTX3 still fails to send to PRX.

I also powered off PTX1 and PTX2 while doing this to make sure there could be no other interference from other transmitters, but again, no success.

I also tried flashing PTX3 to behave like PTX4, again, no luck.

PRX config :

RX address 0:E7,E7,E7,E7,E7,
RX address 1:C2,C2,C2,C2,C2,
RX address 2:D3,
RX address 3:E4,
RX address 4:F5,
RX address 5:A6,
EN_AA:3F,
EN_RXADDR:3F,

PTX3 config:

TX_ADDR:C2,C2,C2,C2,D3
RX address 0:C2,C2,C2,C2,D3
EN_AA:3F
EN_RXADDR:3F

RE: nrf24l01+ multiceiver with three transmitters

Asbjørn — Wed, 28 Jan 2015 14:46:48 GMT

I don't think you are far off, so I would ask you to change the value of the last byte to something like:

RX address 0:E7,E7,E7,E7,E7,
RX address 1:C2,C2,C2,C2,C2,
RX address 2:D3
RX address 3:E4
RX address 4:F5
RX address 5:A6

The last byte have to unique, and using 0xCx would be too similar. May I ask you to try these values and report back?