Published May 15, 2019 © GPL3+

Wireless Communication Using nRF24L01 Transceiver Module

This project will help you to add wireless communication to any of your Arduino-based projects.

IntermediateFull instructions provided1 hour1,334

Wireless Communication Using nRF24L01 Transceiver Module

Story

This tutorial is about the robots and micro-controllers. It is really amazing to see your robot alive and working as expected and believe me it will be more fun if you control your robot or other things wireless with fast and wide range of communication. That is why this tutorial is about wireless communication.

Step 1: Parts

For Transmitter

Arduino Nano or Uno (I’m using Arduino UNO) x1 https://amzn.to/2vTkWzd
Transceiver module nRF24L01 x1 https://amzn.to/2Q4sHeG
Dual Axis Joysticks x2. https://amzn.to/2Q4t0Gm(or other things like push buttons, sensors etc. I’m using Joystick because I want to send data for the position of joystick).

For Receiver:

Arduino Nano or Uno (I’m using Arduino Nano). x1 https://amzn.to/2E7orqa
Transceiver module nRF24L01. x1 https://amzn.to/2Q4sHeG

Others:

Jumper wires https://amzn.to/2JBK4m8

Batteries for Arduino supply https://amzn.to/2W5cDyM and https://amzn.to/2W5cDyM

Step 2: Introduction to nRF and Connections

By the name of Transceiver it is clear that this module can communicate in both ways as a transmitter or as a receiver depends upon programming. It has 8 pins and we are going to use 7 pins. You may observe pins in attached picture.

VCC & GND for supply.

For this purpose we will use 3.3v pin of Arduino.

CE & CSN

Transmitter and receiver pins. We are going to use Arduino (Nano and Uno) Pin 9 for CE and Pin 10 for CSN.

MOSI, MISO & SCK

These are SPI pins.

It communicate with Arduino by SPI pins. Every member in Arduino family has some specific pins for SPI communication.

For Arduino UNO:

SPI pins are

Pin 11 (MOSI)

Pin 12 (MISO)

Pin 13 (SCK)

Arduino Nano SPI pins:

Pin 11 (MOSI)

Pin 12 (MISO)

Pin 13 (SCK)

Same as Arduino UNO.

Now you can make connections for both transmitter and receiver.

Note: You must have a library for nRF24L01 in your Arduino IDE software. Download it by Here.

Step 3: Introduction to Joystick and Connections.

Joystick is nothing but a simple potentiometer. The 2 axis joystick we are using in this tutorial have 5 pins as shown in picture..

Connections for joystick at transmitter end:

VCC to Arduino 5v pin.

GND to Arduino GND

VRx to Arduino Analogue pin A0

VRy to Arduino Analogue pin A1

SW to any spare digital pin of Arduino. (I'm not using this pin but you may use with a little change in code).

For second Joystick

You may use arduino 5V pin for both joysticks.

VRx to Arduino Analogue pin A2VRy to Arduino Analogue pin A3

Using two joysticks means you have to transmit 4-6 parameters.

Step 4: Working and Programming Part

After the construction of transmitter and receiver take out output pins from receiver. I'm using Arduino's digital pin 2 to digital pin 5 for my 4 channel wireless communication. You may extend it upto available digital pins. To check the working of system I attached a robotic arm having 4 servo motors at receiver end.

Arduino Nano Digital pin 2 => Channel 1 => THR

Arduino Nano Digital pin 3 => Channel 2 => YAW

Arduino Nano Digital pin 4 => Channel 3 => PITCH

Arduino Nano Digital pin 5 => Channel 4 => ROLL

Codes for transmitter and receiver are attached. Don't forget to include libraries first in your Arduino IDE software before uploading the code to Arduino.

Step 5: Upgrading

The basic purpose of this tutorial was to cover the part of wireless communication. But you have to make changing according to your purpose and project. For any question and help use the email address given in code files, must watch the video attached and subscribe the channel for support, Thank you.

Code

//Hammadiqbal12@gmail.com

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>

RF24 radio(9, 10); // CE, CSE
const byte address[6] = "00001"; 


int sendingdata[6];

void setup()
{
 
Serial.begin(9600);
  radio.begin();
  radio.openWritingPipe(address);
  radio.setPALevel(RF24_PA_MIN);
  radio.stopListening();
 delay(50);
}

void loop()
{
 

//Analogue Stick readings
 int in1 = analogRead(A0); //Right Stick Up and Down
int in2 = analogRead(A1); //Right Stick Left and Right
int in3 = analogRead(A2); //left Stick Up and Down
 int in4 = analogRead(A3); //Left Stick Left and Right
sendingdata[0]=in1;
sendingdata[1]=in2;
sendingdata[2]=in3;
sendingdata[3]=in4;
 radio.write( sendingdata, sizeof(sendingdata) );
 Serial.print("RY =");
Serial.println(sendingdata[0]);
 Serial.print("LY =");
Serial.println(sendingdata[2]);



  
  delay(15);
}

//hammadiqbal12@gmail.com

#include <SPI.h>
#include <nRF24L01.h>
#include <RF24.h>
#include <Servo.h>
RF24 radio(9, 10); // CE, CSN
const byte address[6] = "00001";
Servo yaw;
Servo pitch;
Servo roll;
Servo thr;

int joystick[6];
void setup() {
  pinMode(2,OUTPUT);
  pinMode(3,OUTPUT);
  pinMode(4,OUTPUT);
  pinMode(5,OUTPUT);
  pinMode(6,OUTPUT);
  Serial.begin(9600);
  radio.begin();
  radio.openReadingPipe(0, address);
  radio.setPALevel(RF24_PA_MIN);
  radio.startListening();
thr.attach(2);
yaw.attach(3);
pitch.attach(4);
roll.attach(5);
delay(25);
}
void loop() {
  if ( radio.available() )
  {
    // Reading the data payload until the RX received everything
    bool done = false;
    while (!done)
    { 
      // Fetching the data payload
      radio.read( joystick, sizeof(joystick) );
     done = true; 
          
     int val0=map(joystick[0],0,1024,0,180);
     int val1=map(joystick[1],0,1024,0,180);
     int val2=map(joystick[2],0,1024,0,180);
     int val3=map(joystick[3],0,1024,0,180);
    thr.write(val0);
    yaw.write(val1);
    pitch.write(val2);
    roll.write(val3);
//for serial observation
    Serial.println(val0);
    Serial.println(val1);
    Serial.println(val2);
    Serial.println(val3);
    }
  }
  else
  {    
      Serial.println("No radio available");
  }
 delay(50);
}

Credits

Hammad Iqbal

6 projects • 43 followers

I'm an Electrical Engineer and here I'm to share my knowledge about Embedded system.

Contact

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Wireless Communication Using nRF24L01 Transceiver Module