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I'm using two nRF24L01 to communicate with each other. I did the right setup and they worked fine, however I wanted to change the air data rate to a lower value, for more stability, as the datasheet says.

How can I setup the configuration for this?

After a small research I knew that you can change this using RF_DR to change the value of the transmission, but I didn't really know how I could exactly write the correct code for this.

Another question: does this effect the range of the module? Or does it only affect the stability? And if not, then which code can I use to extend the range of these two modules ?

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  • Which library are you using?
    – Majenko
    Commented Apr 22, 2016 at 21:16
  • i'm using this library github.com/TMRh20/RF24
    – Med malik
    Commented Apr 22, 2016 at 21:22
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    The documentation tells you how to do it. Did you try reading before coming here? It took me precisely 15 seconds to find it from the link you just provided: tmrh20.github.io/RF24/…
    – Majenko
    Commented Apr 22, 2016 at 21:24
  • can you please tell me where to find it, i'm sorry but i honestly tried to do my best, so if you can, give me where did you find it
    – Med malik
    Commented Apr 22, 2016 at 21:27
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    Did you click the link I provided?
    – Majenko
    Commented Apr 22, 2016 at 21:27

3 Answers 3

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Increasing stability will increase the (usable) range. At least a bit. You could try decreasing the packet size, to make it even more reliable. There is no way to increase the output-power (only decrease).

You could try different channels, and see which one gives you the best range in your application.

After that you have to get NRF24 modules, with external antennas and amplifiers.

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According the nRF datasheet if you decrease the data rate it will definitely affect your range.

A lower data rate will increase your stability due to which the nRF can detect weaker signals (-102 dB at 250Kbps) due to this you can significantly increase the range (up to 1km theoretically).

Also if you need to increase your range further you can attach an antenna with a higher gain than what you already have.

No other software changes will affect the range other than reducing the transmission speed.

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The documentation for the function you want is here.

Reducing the speed doesn't directly increase the range, but increased stability will have the knock-on effect that the fringes of transmission distance will be more reliable, making it appear that you have slightly greater distance.

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  • Your claim about speed and range is untrue. A narrower bandwidth signal has a greater power spectral density for a given total power output, a properly designed receiver listening for a narrower signal sees less total noise, and depending on architecture may see higher gain. The data sheet is even explicit about some of this: " The 1Mbps data rate gives 3dB better receiver sensitivity compared to 2Mbps." However it also mentions that transmitting the same data at a slower rate increases the period of time during which it could be interfered with.
    – Chris Stratton
    Commented May 24, 2016 at 15:56

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