Been searching google and this forum. Found some info but that still didn't helped me with same problem that other have.
My problem is that i can't for some reason force 2 arduinos (UNO & MICRO) to communicate with each other using RF24L01 PA-LNA module in each arduino. All works great with RF24 without antena.
- Code that i'm using is from example for testing. I had to go to basics for troubleshooting.
- I use MIN power as they are quite close to each other (0,5m or in the room tops 5m)
- I use on board power 3.3v but been trying with polou 3.3 step down and 9V battery for tests.
- Had to add 470uF capacitors for 3.3v to ensure that modules will have sufficent peak power capacity to power antennas.
- Measured 8mA while transmitting data. My guess it can even consume more. So nothing big that arduino can't handle.
I don't care about data rate as i will be sending like few bytes of data every 1min on like 70m distance in open air. Unfortunately RF24 w/o antenna is working with maximum distance 50m. My original code and example code delivered with library works on max 50m with these modules without PA-LNA and with MAX power set for transmitting and receiving. I need more power, so i got similar modules with antenas and they don't work...
I've noticed something when i use 1 modules w/o PA-LNA and 1 with PA-LNA on example code. If i setup arduino + module w/o PA-LNA then arduino with PA-LNA see the messages, but either don't send it or this one with PA-LNA is not able to read the message - i get "time out". This way somewhat I confirmed that module with antena is, somewhat, working. When i use only modules with PA-LNA then it completely stop working. Nothing is being recived or sent. However. Been playing with some shielding on MICRO with PA-LNA and antena layout with the other module (arduino Uno + PA-LNA module) like 5m away without shielding and sometimes it worked.
Is this related to too strong signal?
I though that when using MIN power on like 5m away i should get anything. Isn't it?
Strange that whenever i played or hold antena in hands it sometimes worked. But that drives me to point that 5m is too short distance and signal is too strong. But when i take out antenats it still don't work.
- 2 arduinos with 2 24L01 PA-LNA modules
- 470uF capacitors in 3.3v on board power added and from there i take power (been also trying from step down 3.3 power unit pulling down from 9V battery). Capacity definitely help with these w/o antenna
- distance 5m in house between modules
- example code from 24 lib for tests
with modules w/o PA-LNA works, but changing them to those with PA-LNA it does not.