An ultra low cost RF module

The nRF24L01 is a highly integrated, ultra low power (ULP) 2Mbps RF transceiver IC for the 2.4GHz ISM (Industrial, Scientific and Medical) band. With peak RX/TX currents lower than 14mA, a sub μA power down mode, advanced power management, and a 1.9 to 3.6V supply range, the nRF24L01 provides a true ULP solution enabling months to years of battery lifetime when running on coin cells or AA/AAA batteries .


The devices supports SPI and the pinout is as follows.

Image Source :

It is worth noting that the pins of NRF24L01 , provided with IoT lab are 5V tolerant but ensure that only 3.3v is made available to Vcc

Interfacing with Arduino

The sketch given below simply turns on a LED on the receiver when a button on the transmitter is pressed. The transmitter transmits the code "111." The receiver receives the code "111" and turns on the LED.

Ensure the RF24 library is installed , else download it (as zip) from here . You can install the library in Arduino IDE using Sketch-> Import library-> Add library. Another way is to extract the zip file to your Arduino home directory: Arduino/libraries on Linux


  • Pin 9 - CE
  • Pin 10 - CS(N)
  • Pin 11 - MOSI
  • Pin 12 - MISO
  • Pin 13 - SCK
  • On the Receiver:
  • Pin 3 - LED
  • On the Transmitter:
  • Pin 7 - Button
  • Arduino Code - Transmitter/Receiver

    You may clone the NRF24L01 repo using

     git clone

    Example Project for sending and receiving data on NRF24L01 using maniacbug library