NRF24L01 2.4Ghz Wireless Module (NRF24L01) [S275]






https://www.youtube.com/watch?v=CVfX8fmW6Bk


GitHub : https://github.com/rdiot/rdiot-s275.git


* Specs

nRF24L01 is a single chip radio transceiver for the world wide 2.4 - 2.5 GHz ISM band. 

The transceiver consists of a fully integrated frequency synthesizer, a power amplifier, a crystal oscillator, a demodulator, modulator and Enhanced ShockBurst? protocol engine. 

Output power, frequency channels, and protocol setup are easily. 

programmable through a SPI interface. 

Current consumption is very low, only 9.0mA at an output power of -6dBm and 12.3mA in RX mode. 

Built-in Power Down and Standby modes makes power saving easily realizable. 

Maximum operating speeds up to 2Mbps, GFSK modulation efficiency, Anti-interference ability, Particularly suitable for industrial control applications. 

125 Communications channels, Multi-point communication and frequency hopping to meet the communication needs. 

Built-in hardware CRC error detection, Multipoint communication address control. 

Low-power 1.9 ~ 3.6V, only 1uA on Power down mode. 

Built-in 2.4Ghz antenna. 

Available software to set the address, only received local Address when output data(Provide interrupt instruction), can be directly connected to a variety of microcontrollers, Software programming is very convenient. 

Support 6 Data channels of data reception. 

Standard DIP Pitch Interface for embedded applications. 


* Contents

- Connect 


VCC - 3.3V

CSN - D8

MOSI - D11

IRQ - NONE

GND - GND

CE - D7

SCK - D13

MISO - D12


- parts

Rotary Encoder Module (KY-040) [S120]


- Library : https://github.com/nRF24/RF24

- Tested Library Download :  RF24-master.zip



- Key Code

- RF24_TX : https://github.com/rdiot/rdiot-s275/blob/master/RF24_TX.ino

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

#include <SPI.h>

#include <nRF24L01.h>

#include <RF24.h>


LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x20 for a 16 chars and 2 line display


RF24 radio(7, 8); // SPI Bus CE, CSN 

const byte address[6] = "00001"; // RX = TX same address

int pin = A0; // Rotary Encoder Module (KY-040) [S120] : http://rdiot.tistory.com/126 [RDIoT Demo]


void setup() {

  pinMode(pin, INPUT);

  

  Serial.begin(9600);

  

  radio.begin();

  radio.openWritingPipe(address);

  radio.setPALevel(RF24_PA_MIN); // Power Level : accoding to distance : RF24_PA_MIN / RF24_PA_LOW / RF24_PA_HIGH / RF24_PA_MAX


  radio.stopListening();  // TX 


  lcd.init(); // initialize the lcd 

  lcd.backlight();

  lcd.print("start LCD1602");

  delay(1000);

  lcd.clear();

    

}


void loop() {

  lcd.setCursor(0,0);

  lcd.print("S275:RF24L01 TX");

  

  int readVal = analogRead(pin);

  readVal = map(readVal, 0, 1023, 0, 179);

  Serial.println(readVal);


  lcd.setCursor(0, 1);

  lcd.print("msg=>" + String(readVal) + "  ");

   

  char buf[4];

  itoa(readVal, buf, 10);

    

  radio.write(&buf, sizeof(buf)); //send messages to RX 

  delay(10);

  

}


- RX24_RX : https://github.com/rdiot/rdiot-s275/blob/master/RF24_RX.ino

#include <Wire.h> 

#include <LiquidCrystal_I2C.h>

#include <SPI.h> 

#include <nRF24L01.h>

#include <RF24.h>

#include <Servo.h> 


LiquidCrystal_I2C lcd(0x27,16,2);  // set the LCD address to 0x20 for a 16 chars and 2 line display


RF24 radio(7, 8); // SPI Bus CE, CSN 

const byte address[6] = "00001"; // TX = RX same address


Servo myservo; 

int servoPin = 4; 


void setup() {


  Serial.begin(9600);

  

  radio.begin();

  radio.openReadingPipe(0, address);

  radio.setPALevel(RF24_PA_MIN); // Power Level : accoding to distance : RF24_PA_MIN / RF24_PA_LOW / RF24_PA_HIGH / RF24_PA_MAX


  radio.startListening(); // RX


  myservo.attach(servoPin); 


  lcd.init(); // initialize the lcd 

  lcd.backlight();

  lcd.print("start LCD1602");

  delay(1000);

  lcd.clear();

 

}


void loop() {

  lcd.setCursor(0,0);

  lcd.print("S275:RF24L01 RX");


  lcd.setCursor(0, 1);

  if (radio.available()) {    

    char text[4] = "";

    

    radio.read(&text, sizeof(text));

    Serial.println(text);

    

    lcd.print("rcv=>" + String(text) + "     ");


    int value = atoi(text);

     myservo.write(180-value);

  }


  delay(10);

  

}


- how to debug radio details 

#include <printf.h>


  printf_begin();

  radio.printDetails();





Posted by RD IoT RDIoT

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