nrf24l01 with RF24 library: lots of interference

Projects Networking, Protocols, and Devices
1

Hey guys,

I just got a set of nrf24l01 modules and connected them to a nano. I got the RF24 library and I'm running the scanner example sketch. If I understand correctly, ideally it would print out all zero's all the time (meaning no data was found on any of the channels).

At first this was the case, but now I'm seeing lots of interference. Here is some example output of the scanner sketch:

ed98899bdfeca9999bcecb87788aceca88889bcecb8889ace0db9999acddba77789bdeb97888acddba8889bd0fca8999bdeca98778aceda77889bceca9999acf
a96799ccdcb989accedeba78abdcdba8779bacbc9868abccdba889bccedda979acccda9777abbbbb87699ccdcb9799cdeddb987aadcdba7688bbccb9877aadce
8aa9aab9989abbbcbb99acccdcca98abbcbca97899babab888abbcbda98abcdcecb999acbcbb9879baaaba978aacbcbb999adccccba89abbbbba8899aaaaba89
dbb8789babac9878abcbdba88abecdcca989abcbca9778ababaa9789bbcbcb989bcddddba89accccba878ababab9979abcbcba89acdcdcdaa89bbcbdaa779aba
8acbcbca978aaba9aa8899cbbbba999bcccdcba8aabbbbba898aaaabb9879abbbcba89acccdcca98abbcbcaa789bbabaa888abbcbca98abcdcccb989acbbbb98

As you can see, every channel is cluttered with interference.
When I run the GettingStarted sketch in transmitter mode I get the following output:

Now sending 46056...ok...Got response 4294967295, round-trip delay: 46058
Now sending 47058...ok...Got response 4294967295, round-trip delay: 47060
Now sending 48061...ok...Got response 4294967295, round-trip delay: 48063
Now sending 49063...ok...Got response 4294967295, round-trip delay: 49065
Now sending 50065...ok...Got response 4294967295, round-trip delay: 50068
Now sending 51067...ok...Got response 4294967295, round-trip delay: 51070
Now sending 52070...ok...Got response 4294967295, round-trip delay: 52073
Now sending 53072...ok...Got response 4294967295, round-trip delay: 53075
Now sending 54075...ok...Got response 4294967295, round-trip delay: 54077
Now sending 55077...ok...Got response 4294967295, round-trip delay: 55079
Now sending 56080...ok...Got response 4294967295, round-trip delay: 56082

If you look at the received response you can see that it is not the same as the original data and it looks like interference again.
Any idea what's going on here?

2

You have an error in your unposted code. The value being returned is ffffffff and I am much too lazy to go look for it...

3

You have to connect it to the Nano slightly differently, since it has separate SPI pins. Check my solution nRF24l01 library help - Programming Questions - Arduino Forum.