one question ! about interference wave !

[Reza]

hi i want know the mysensors device with nrf radio have not any interference wave with other RF and other wireless devices?

[LastSamurai]

I am not sure if I really get your question, but sure mysensors (or specificly the NRF24L01+) interferes with anyone else using the same frequency (like all senders do). But I haven't had any problems with any other devices (not even WLAN) and you can always switch the used channel to something else.
Other devices also interfere with the nodes. I have read in this forum that some users had problem receiving when the microwave was running

So short answer: yes, but normally it shouldn't really matter.

[Reza]

@LastSamurai said:

I am not sure if I really get your question, but sure mysensors (or specificly the NRF24L01+) interferes with anyone else using the same frequency (like all senders do). But I haven't had any problems with any other devices (not even WLAN) and you can always switch the used channel to something else.
Other devices also interfere with the nodes. I have read in this forum that some users had problem receiving when the microwave was running

So short answer: yes, but normally it shouldn't really matter.

so if there was same problem can i use change the frequency band ? how do it?

[mfalkvidd]

If you have a problem it is much more likely that it is related to power and shielding. If you describe the problem we might be able to help you.

The channel is set in MyConfig.h
https://github.com/mysensors/Arduino/blob/d7459ae0503feac0b38d3c923b8b16f4faa8e777/libraries/MySensors/MyConfig.h#L116

[Reza]

@mfalkvidd said:

If you have a problem it is much more likely that it is related to power and shielding. If you describe the problem we might be able to help you.

The channel is set in MyConfig.h
https://github.com/mysensors/Arduino/blob/d7459ae0503feac0b38d3c923b8b16f4faa8e777/libraries/MySensors/MyConfig.h#L116

thank you

[TRS-80]

Somewhat related, is anyone aware of a tool that would allow you to visualize (or otherwise look at in any fashion) RF spectrum, without spending an arm and a leg?

I know I have an app on my Android called Wi-Fi Analyzer, it's very helpful some times in diagnosing overlapping Wi-Fi channels in a crowded apartment building for example.

I suppose I was just wondering if there was something more generalized to RF and not Wi-Fi channels specifically?

[Oitzu]

@TRS-80 you may want to look at RTL-SDR http://www.rtl-sdr.com/about-rtl-sdr/

If you just want to scan on the nrf24l01+ channel range, this is maybe enough for you: https://maniacbug.github.io/RF24/scanner_8pde-example.html

[siklosi]

I modified poor man's scanner script so that you can see all 127 channels..

http://forum.mysensors.org/topic/2454/node-cant-see-gateway-less-than-10m-away/11

[mfalkvidd]

Yveaux' sniffer might be useful as well

[TRS-80]

Thanks for replies guys. Any of these may prove useful in the event of troubleshooting.

That RTL-SDR thing looks really cool though! So many different applications! I'm sure I will be picking one up sooner or later, just to play around with...

[mfalkvidd]

Just a note: The most common RT-SDRs can not receive 2.4GHz (limit is 1.5-2.2GHz depending on chipset) so you can't use that for nrf24l01 signals unfortunately.

[DavidZH]

A step up in price from the RTL-SDR you'd find the RF-explorer; price from $270.

• Hardware with display.
• Free (and also payed) software to get a better picture of the situation.
• sub-1GHz and 2.4 GHz in the same device.

Not affiliated with the company, but I have used one and was pleasantly surprised