Project 12:  Arduino IR Remote-infrared communication 

Main Ideas:

IR or infrared communication is one of the most common methods of wireless communication due to being easy to use and having an affordable price. Infrared light, with a wavelength longer than visible light, is not within the range of human vision. That’s why it’s a good option for wireless communications. When you press a button on your TV control, an LED on your control turns on and off continuously and causes a modulated infrared signal to send from the control to your TV. The command will execute after the signal is demodulated. IR receiver modules are used to receive IR signals. These modules work in 3, 8 KHz frequency. When the sensor is not exposed to any light at its working frequency, the Vout output has a value equal to VS (power supply). With exposing to a 38 kHz infrared light, this output will be zero.

/*********   https://arduino4everyones.blogspot.com/   *********/ #include <IRremote.h>   const int RECV_PIN = 7; IRrecv irrecv(RECV_PIN); decode_results results; unsigned long key_value = 0; int  onoff = 15; // control the blinking int led_green = 11; // the red LED is connected to Pin 11 of the Arduino int led_yellow = 12; // the yellow LED is connected to Pin 12 of the Arduino int led_red = 13; // the green LED is connected to Pin 13 of the Arduino int led_white = 10; // the green LED is connected to Pin 13 of the Arduino void setup() {   Serial.begin(9600);   irrecv.enableIRIn();   // irrecv.blink13(true);   // set up all the LEDs as OUTPUT   pinMode(led_red, OUTPUT);   pinMode(led_yellow, OUTPUT);   pinMode(led_green, OUTPUT);     //blinking(); }   void loop() {   if (irrecv.decode(&results)) {       if (results.value == 0XFFFFFFFF)       results.value = key_value;       switch (results.value) {       case 0xFFA25D:         Serial.println("CH-");         // turn the green LED on and the other LEDs off         digitalWrite(led_red, LOW);         digitalWrite(led_yellow, LOW);         digitalWrite(led_green, HIGH );         digitalWrite(led_white, LOW );         break;       case 0xFF629D:         Serial.println("CH");         // turn the yellow LED on and the other LEDs off         digitalWrite(led_red, LOW);         digitalWrite(led_yellow, HIGH);         digitalWrite(led_green, LOW);         digitalWrite(led_white, LOW );         break;       case 0xFFE21D:         Serial.println("CH+");         // turn the red LED on and the other LEDs off         digitalWrite(led_red, HIGH);         digitalWrite(led_yellow, LOW);         digitalWrite(led_green, LOW);         break;       case 0xFF22DD:         Serial.println("|<<");         // turn the red LED on and the other LEDs off         digitalWrite(led_red, HIGH);         digitalWrite(led_yellow, HIGH);         digitalWrite(led_green, LOW);         digitalWrite(led_white, LOW );         break;       case 0xFF02FD:         Serial.println(">>|");         // turn the red LED on and the other LEDs off         digitalWrite(led_red, LOW);         digitalWrite(led_yellow, HIGH);         digitalWrite(led_green, HIGH);         digitalWrite(led_white, LOW );         break ;       case 0xFFC23D:         Serial.println(">|");         // turn the red LED on and the other LEDs off         digitalWrite(led_red, HIGH);         digitalWrite(led_yellow, HIGH);         digitalWrite(led_green, HIGH);         break ;       case 0xFFE01F:         Serial.println("-");         digitalWrite(led_red, HIGH);         digitalWrite(led_yellow, HIGH);         digitalWrite(led_green, HIGH );         digitalWrite(led_white, HIGH );         break ;       case 0xFFA857:         Serial.println("+");         break ;       case 0xFF906F:         Serial.println("EQ");         break ;       case 0xFF6897:         Serial.println("0");         // turn the red LED on and the other LEDs off         digitalWrite(led_red, LOW);         digitalWrite(led_yellow, LOW);         digitalWrite(led_green, LOW);         digitalWrite(led_white, LOW );         break ;       case 0xFF9867:         Serial.println("100+");         blinking();         break ;       case 0xFFB04F:         Serial.println("200+");         break ;       case 0xFF30CF:         Serial.println("1");         break ;       case 0xFF18E7:         Serial.println("2");         break ;       case 0xFF7A85:         Serial.println("3");         break ;       case 0xFF10EF:         Serial.println("4");         break ;       case 0xFF38C7:         Serial.println("5");         break ;       case 0xFF5AA5:         Serial.println("6");         break ;       case 0xFF42BD:         Serial.println("7");         break ;       case 0xFF4AB5:         Serial.println("8");         break ;       case 0xFF52AD:         Serial.println("9");         break ;     }     key_value = results.value;     irrecv.resume();     delay(100);   } }   void blinking() {     int  looponoff = 0; // save the time that we started moveback   while (looponoff < onoff) // stay in this loop until timeToTrunRight5CM ( seconds) has elapsed   {     looponoff = looponoff + 1;     // turn the green LED on and the other LEDs off     digitalWrite(led_red, LOW);     digitalWrite(led_yellow, LOW);     digitalWrite(led_green, LOW );     digitalWrite(led_white, HIGH );     delay(100);    // wait 2 seconds     // turn the green LED on and the other LEDs off     digitalWrite(led_red, LOW);     digitalWrite(led_yellow, LOW);     digitalWrite(led_green, HIGH );     digitalWrite(led_white, LOW );     delay(100);    // wait 2 seconds       // turn the yellow LED on and the other LEDs off     digitalWrite(led_red, LOW);     digitalWrite(led_yellow, HIGH);     digitalWrite(led_green, LOW);     digitalWrite(led_white, LOW );     delay(100);   // wait 0.5 second       // turn the red LED on and the other LEDs off     digitalWrite(led_red, HIGH);     digitalWrite(led_yellow, LOW);     digitalWrite(led_green, LOW);     digitalWrite(led_white, LOW );     delay(100);  // wait 2 seconds   }   // turn off all EDs off   digitalWrite(led_red, LOW);   digitalWrite(led_yellow, LOW);   digitalWrite(led_green, LOW);   digitalWrite(led_white, LOW ); }