NRF24L01+ seems very sensitive to electric noise

RE: NRF24L01+ seems very sensitive to electric noise

Turbo J — Sat, 03 Mar 2018 11:08:05 GMT

EMI issues should be resolved at the schematic/layout level of the PCB. Software can only do so much in that case.

RE: NRF24L01+ seems very sensitive to electric noise

AddyLocks — Sat, 03 Mar 2018 08:07:14 GMT

Hey @Vidar, did you find a suitable method to restart the nRF24L01+ from the MCU when a timeout occurs yet? I am facing a similar issue, and it would be great if you could share how you managed to tackle the issue.

RE: NRF24L01+ seems very sensitive to electric noise

Vidar Kristiansen — Tue, 08 Jul 2014 13:15:00 GMT

@Tim

Thank you answering

1 I have that already, but I am not sure how to restart the nRF24L01+ from the MCU when a timeout occurs.

3 It is a fairly small 6V DC motor, so 3x 100 nF seems to have done the trick regarding just that problem. But sure, I can opt for some with a larger capacitance.

4 Yes I do have a 100µF electrolyte capacitor after the regulator, and a 100nF ceramic capacitor in parallel with it also, to filter noise with frequencies that the electrolyte is not so good at.

5 I am not quite sure as to how that would help me diagnose the problem. Running it from a separate battery would probably make it even more difficult, if not impossible, to reproduce the error. And the error is pretty hard to reproduce as it is. Its one of those pesky ones, that come and go, actually it comes on rare occasions. So, it is a matter of testing, testing and testing until it occurs.

RE: NRF24L01+ seems very sensitive to electric noise

Tim — Tue, 08 Jul 2014 12:09:28 GMT

Some ideas:

Use a watchdog timer.
Output a square wave from the nRF and detect it from the Atmega to check for liveness.
Add a larger smoothing capacitor for the motor. 300 nF is not very much for a motor.
Add another capacitor for the nRF after the regulator (do you have one)?
Run the nRF from a separate battery to see what causes the problem exactly.

I've used Sparkfun's 3.3V step-up regulator for powering an nRF51822 from 2xAA batteries and it works fine.