邁入『物聯網』的第一步：如何使用無線傳輸：基本篇

Board

int.0

int.1

int.2

int.3

int.4

int.5

Uno, Ethernet

2

3

Mega2560

2

3

21

20

19

18

Leonardo

3

2

0

1

7

nFR24L01 2.4G無線模組發射模組

接腳

接腳說明

Arduino開發板接腳

1

VCC 3.3V

Arduino +3.3V

2

GND                   

Arduino GND板接腳

3

MOSI

Arduino Digital Pin 11

4

MISO

Arduino Digital Pin 12

5

SCK

Arduino Digital Pin 13

6

CE

Arduino Digital Pin 8

7

CSN

Arduino Digital Pin 7

8

IRQ(Using Interrupt 0)

Arduino Digital Pin 2

▲透視圖

▲nFR24L01 2.4G無線模組

▲Arduino UNO開發版

nFR24L01 2.4G無線模組接收模組

接腳

接腳說明

Arduino開發板接腳 

1

VCC 3.3V

Arduino +3.3V

2

GND                   

Arduino GND板接腳

3

MOSI

Arduino Digital Pin 51

4

MISO

Arduino Digital Pin 50

5

SCK

Arduino Digital Pin 52

6

CE

Arduino Digital Pin 8

7

CSN

Arduino Digital Pin 53

8

IRQ(Using Interrupt 1)

Arduino Digital Pin 3

▲透視圖

▲nFR24L01 2.4G無線模組

▲Arduino Mega 2560開發板

nFR24L01 2.4G無線模組發射測試程式(ping_client)

/**

 * A Mirf example to test the latency between two Ardunio.

 *

 * Pins:

 * Hardware SPI:

 * MISO -> 12

 * MOSI -> 11

 * SCK -> 13

 *

 * Configurable:

 * CE -> 8

 * CSN -> 10

 *

 * Note: To see best case latency comment out all Serial.println

 * statements not displaying the result and load

 * 'ping_server_interupt' on the server.

 */

#include <SPI.h>

#include <Mirf.h>

#include <nRF24L01.h>

#include <MirfHardwareSpiDriver.h>

byte num = 0 ;

byte num1 = 0 ;

void setup() {

  Serial.begin(9600);

  /*

   * Setup pins / SPI.

   */

  /* To change CE / CSN Pins:

   *

   * Mirf.csnPin = 9;

   * Mirf.cePin = 7;

   */

  /*

  Mirf.cePin = 7;

  Mirf.csnPin = 8;

  */

  Mirf.spi = &MirfHardwareSpi;

  Mirf.init();

   Mirf.payload = 1;      // this means length of send data

  /*

   * Configure reciving address.

   */

  /*

   * To change channel:

   *

   * Mirf.channel = 10;

   *

   * NB: Make sure channel is legal in your area.

   */

  Mirf.config();

  Mirf.setTADDR((byte *)"bruce");

  Mirf.setRADDR((byte *)"UNO");

  Serial.println("Beginning ... ");

}

void loop() {

  unsigned long time = millis();

 // Serial.println("get time data finish...");

//  Mirf.setTADDR((byte *)"bruce");

//  Serial.println("set target server finish...");

  if (num >= 255)

      num = 0 ;

    transmit((char)num)  ;

    Serial.print(num);

    Serial.print(" S    " );

    num ++ ;

if (!Mirf.isSending() && Mirf.dataReady()) {

        Mirf.getData((byte *) &num1);

           Serial.print("/");

          Serial.print(num1);

            Serial.print("  R ");

            Serial.print("\n");

      }

      else

      {

               Serial.print("\n");

      }

/*

  Serial.print("sending data: ");

  Serial.print(time);

  Serial.print(" to server finish...\n") ;

  while (Mirf.isSending()) {

    // wait data sending....until finished

  }

  Serial.println("data sending..finished");

  delay(10);

  while (!Mirf.dataReady()) {

    //Serial.println("Waiting");

    if ( ( millis() - time ) > 1000 ) {

      Serial.println("Timeout on response from server!");

      return;

    }

  }

  Mirf.getData((byte *) &time1);

  Serial.print("Ping: ");

  Serial.print(time1);

  //Serial.print("and cost time : ");

  //

  // Serial.print(time1 - time);

  Serial.print(" ; Get echo from server ... \n") ;

  Serial.print("==============\n\n\n") ;

  delay(1000);

  */

}

void transmit(char st)

{

  byte c;

   // Serial.println("Now enter char sending");

    c = st;

    Mirf.send(&c);

    while( Mirf.isSending() ) ;

}

void transmit( float v)

{

  byte c;

  char buf[10];

  dtostrf(v,9,3,buf);

  for( int i=0 ; i<8 ; i++ )

  {

    c = buf[i];

    Mirf.send(&c);

    while( Mirf.isSending() ) ;

  }

}

// sends a string via the nRF24L01

void transmit(const char *string)

{

  byte c;

  for( int i=0 ; string[i]!=0x00 ; i++ )

  {

    c = string[i];

    Mirf.send(&c);

    while( Mirf.isSending() ) ;

  }

}

// send a CR/LF sequence via the nRF24L01

void transmitlf(void)

{

  byte c;

  c = '\r';

  Mirf.send(&c);

    while( Mirf.isSending() ) ;

  c = '\n';

  Mirf.send(&c);

    while( Mirf.isSending() ) ;

}

void waitforsending()

{

unsigned long  t1 = millis() ;

unsigned long  t2 = millis() ;

   while(Mirf.isSending())

      {

        t2 = millis() ;

            Serial.println(t2-t1) ;

        if ((t2-t1) >=200 )

            return ;

      }

}  

void waitforreceiving()

{

unsigned long  t1 = millis() ;

unsigned long  t2 = millis() ;

   while(Mirf.dataReady())

      {

        t2 = millis() ;

            Serial.println(t2-t1) ;

        if ((t2-t1) >=200 )

            return ;

      }

}  

nFR24L01 2.4G無線模組接收測試程式(ping_server)

/**

 * An Mirf example which copies back the data it recives.

 *

 * Arduino UNO Pins:

 * Hardware SPI:

 * MISO -> 12

 * MOSI -> 11

 * SCK -> 13

 *

  * Arduino MEGA 2560 use Pins:

 * Hardware SPI:

 * MISO -> 50

 * MOSI -> 51

 * SCK -> 52

 * Configurable:

 * CSN -> 7

* CE -> 8

 */

#include <Wire.h>

#include <LiquidCrystal_I2C.h>

LiquidCrystal_I2C lcd(0x27, 20, 4); // set the LCD address to 0x27 for a 16 chars and 2 line display

#include <SPI.h>

#include <Mirf.h>

#include <nRF24L01.h>

#include <MirfHardwareSpiDriver.h>

#define ledpin 7

byte recvdata ;

void setup() {

    //  pinMode(ledpin,OUTPUT) ;

  Serial.begin(9600);

  lcd.init();                      // initialize the lcd

  // Print a message to the LCD.

  lcd.backlight();

  lcd.print("RF Monitor!");

  /*

   * Set the SPI Driver.

   */

  Mirf.spi = &MirfHardwareSpi;

  /*

   * Setup pins / SPI.

   */

  Mirf.init();

  /*

   * Configure reciving address.

   */

  Mirf.setRADDR((byte *)"bruce");

   Mirf.setTADDR((byte *)"UNO");

  /*

   * Set the payload length to sizeof(unsigned long) the

   * return type of millis().

   *

   * NB: payload on client and server must be the same.

   */

 Mirf.payload =1;

  /*

   * Write channel and payload config then power up reciver.

   */

  Mirf.config();

  Serial.println("Listening...");

  pinMode(ledpin,OUTPUT) ;

}

void loop() {

    lcd.setCursor(0, 1) ;

     lcd.print("               ");

      lcd.setCursor(0, 1) ;

      lcd.print(millis()) ;

  //  Serial.println(millis()) ;

  /*

   * A buffer to store the data.

   */

  // byte data[Mirf.payload];

  //  Serial.println("now looping...");

  /*

   * If a packet has been recived.

   *

   * isSending also restores listening mode when it

   * transitions from true to false.

   */

Serial.println("Now waiting Get Data");

if (!Mirf.isSending() && Mirf.dataReady()) {

  //  if(Mirf.dataReady()){

   Serial.println("Get packet before");

    /*

     * Get load the packet into the buffer.

     */

       Mirf.getData(&recvdata);

   Serial.println("GOt packet after");

    /*

     * Set the send address.

     */

    lcd.setCursor(0, 2) ;

     lcd.print("               ");

      lcd.setCursor(0, 2) ;

      lcd.print(millis()) ;

    lcd.setCursor(0, 3) ;

     lcd.print("               ");

      lcd.setCursor(2, 3) ;

      lcd.print(recvdata) ;

      /*

    for (int i = 0 ; i < Mirf.payload; i++)

    {

      lcd.setCursor(2+(i)*4, 2) ;

      lcd.print(data[i],HEX) ;

   //   lcd.print((unsigned long)*data) ;   // use for unsign long

    }

    */

    //       delay(10);

  }

}

void messagecoming()

{

  digitalWrite(ledpin, HIGH) ;

  delay(3);

  digitalWrite(ledpin, LOW) ;

  delay(3); 

} 

曹永忠 (Yung-Chung Tsao)：目前為自由作家、台灣資訊傳播學會秘書長，專研於軟體工程、軟體開發與設計、物件導向程式設計，商品攝影及人像攝影。長期投入資訊系統設計與開發、企業應用系統開發、軟體工程、新產品開發管理、商品及人像攝影等領域，並持續發表作品及相關專業著作。

Email:prgbruce@gmail.com ，Line ID：dr.brucetsao 

Arduino部落格：http://taiwanarduino.blogspot.tw/

範例原始碼網址：https://github.com/brucetsao/arduino_RFProgramming

臉書社群(Arduino.Taiwan)：https://www.facebook.com/groups/Arduino.Taiwan/

Arduino活動官網：http://arduino.kktix.cc/

Youtube：https://www.youtube.com/channel/UCcYG2yY_u0m1aotcA4hrRgQ