NRF - 24L01 and Arduino Wireless Comunication tutorial

Overview

In this tutorial, we will learn how to make wireless communication between two NRF-24L01 module using Arduino. Also, make a wireless doorbell by using the NRF-24L01 module with Arduino.

You can watch the following video below:-

Components Required

The required components list for this project given below:-

Arduino Uno

Arduino Nano

Two NRF-24L01 Module

Doorbell

5V Relay Module

Push Button

10K Resistor

Vero Board

Some Jumper Wire

NRF-24L01 Pinout

The pin configuration of NRF-24L01 has been given below:-

Fig: NRF-24L01 pinout

Circuit Schematic

The transmitter circuit diagram of the doorbell has been given below:-

Fig: Transmitter circuit diagram

The receiver circuit diagram of the doorbell has been given below:-

Fig: Receiver circuit diagram

Circuit Description

Source Code

The transmitter source code is given below:-

 #include <SPI.h>  
 #include <nRF24L01.h>  
 #include <RF24.h>  
   
 #define buttonPin 2  
   
 int buttonState = 0;  
   
 RF24 radio(7, 8); // CE, CSN  
 const byte address[6] = "00001";  
 void setup() {  
  pinMode(buttonPin, INPUT);  
  Serial.begin(9600);  
  radio.begin();  
  radio.openWritingPipe(address);  
  radio.setPALevel(RF24_PA_MIN);  
  radio.stopListening();  
 }  
 void loop() {  
  buttonState = digitalRead(buttonPin);  
  Serial.println(buttonState);  
  radio.write(&buttonState, sizeof(buttonState));  
 }

The receiver source code is given below:-

 #include <SPI.h>  
 #include <nRF24L01.h>  
 #include <RF24.h>  
   
 #define relayPin 4  
   
 int buttonState = 0;  
   
 RF24 radio(6,7); // CE, CSN  
 const byte address[6] = "00001";  
   
 void setup() {  
  Serial.begin(9600);  
  pinMode(relayPin, OUTPUT);  
  digitalWrite(relayPin, HIGH);  
  radio.begin();  
  radio.openReadingPipe(0, address);  
  radio.setPALevel(RF24_PA_MIN);   
 }  
   
 void loop() {  
  radio.startListening();  
  while (!radio.available());  
  radio.read(&buttonState, sizeof(buttonState));  
    
  if (buttonState == HIGH) {  
   digitalWrite(relayPin, LOW);  
  }  
  else {  
   digitalWrite(relayPin, HIGH);  
  }  
 }