App note: nRF24L01+ 2.4GHz wireless transceiver

The nRF24L01+ ICs are 2.4GHz transceivers that only need a few external parts. They’re controlled by a simple SPI protocol, and two extra pins. The IRQ pin signals when data is available and can be used to wake a microconroller with an interrupt.  The CE pin is an input activates/deactivates the transceiver.

126 channels are possible, each channel can support one master and 6 slave devices. It is also possible, with a microcontroller, to build a master unit that communicates over all 126 channels.

Nordic modules are available on eBay for a few bucks. We found the reference design they all seem to be based on in the nRF24L01+ evaluation kit archive. nRF24L01pluss_REFERENCE_MODULES.pdf documents the modules, and the reference module gerber files are included if you want to make your own boards.

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4 Comments

    1. I agree. I’ve been looking at both the nRF24Z1 and TI CC8520 for a project I have in mind. Picked the CC8520 because of the superior availability, but the tricky HF part has been keeping me from doing it.

      1. There exist two affordable breakout boards for the nRF, one of which is currently available. There is also the higher priced eval kit from TI which comes as a complete wireless solution including batteries and complete analog frontend. Nice extra: the additional low-bandwidth serial channel.

        @Rubu: that sounds interesting – did you do any testing at all?

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