Arduino NRF24L01 User Manual

Arduino Wireless Communication –
NRF24L01 Tutorial
Dejan Nedelkovski
Arduino Tutorials
36
In this Arduino tutorial we will learn how to make a wireless communication between two
Arduino boards using the NRF24L01 transceiver module. You can watch the following
video or read the written tutorial below.
Overview
For explaining the wireless communication we will make two examples, the first one will be
sending a simple “Hello World” message from one Arduino to another, and in the second
example we will have a bi-directional communication between the Arduino boards, where
using the Joystick at the first Arduino we will control the servo motor at the second
Arduino, and vice versa, using the push button at the second Arduino we will control the
LED at the first Arduino.
NRF24L01 Transceiver Module
Let’s take a closer look at the NRF24L01 transceiver module. It uses the 2.4 GHz band
and it can operate with baud rates from 250 kbps up to 2 Mbps. If used in open space and
with lower baud rate its range can reach up to 100 meters.

Arduino NRF24L01 Specifications

General

Maximum Data Rate	2 Mbps
Number of Channels	125
Interface	SPI
Data Rate	250kbps, 1Mbps, 2Mbps
Operating Voltage	1.9V - 3.6V
Current Consumption	11.3mA transmitting, 12.3mA receiving
Range	Up to 100 meters (open space)
Dimensions	15mm x 29mm

Summary

NRF24L01 Connections to Arduino

NRF24L01 SPI Pin Connections

Arduino Codes for Wireless Communication

Example 1 Transmitter Code

Provides the Arduino code for the transmitter in the first example.

Example 1 Receiver Code

Provides the Arduino code for the receiver in the first example.

Code Description and Logic

RF24 Object and Communication Address

Sending "Hello World" Message

Receiving and Printing Message

Bi-directional Wireless Communication Example

Example 2 Source Codes

Example 2 Transmitter Code

Provides the Arduino code for the transmitter in the second example.

Example 2 Receiver Code

Provides the Arduino code for the receiver in the second example.

Bi-directional Communication Logic Details

Defining Communication Pipes

Joystick to Servo Control Logic

Details sending joystick data to control a servo motor.

Button to LED Control Logic

Explains receiving button state to control an LED.

NRF24L01 Comprehensive Specifications

NRF24L01 Pinout Table

Details the pinout and connections to different Arduino boards and libraries.

NRF24L01 Power Supply Solutions

NRF24L01 Pin Description (UNO/MEGA)

Wiring Diagrams

Transmitter Wiring Diagram

Receiver Wiring Diagram