dfrobot_ir

#include<IRremote.h>      //including infrared remote header file

#define button_2 34935         //code for button 1
#define button_4 10455         //code for button 2
#define button_5 43095         //code for button 3
#define button_6 26775         //code for button 4
#define button_8 39015         //code for button 4

int RECV_PIN = 9;        //IR receiver pin
IRrecv irrecv(RECV_PIN);
decode_results results;

unsigned int value;

int speedPin_M1 = 5;     //M1 Speed Control
int speedPin_M2 = 6;     //M2 Speed Control
int directionPin_M1 = 4;     //M1 Direction Control
int directionPin_M2 = 7;     //M1 Direction Control

void setup() {
  Serial.begin(9600);

  pinMode(speedPin_M1, OUTPUT);
  pinMode(speedPin_M2, OUTPUT);
  pinMode(directionPin_M1, OUTPUT);
  pinMode(directionPin_M2, OUTPUT);

  irrecv.enableIRIn();    //

}

void loop() {
  if (irrecv.decode(&results))  {
    value = results.value;

    if (value == button_2) {
      carAdvance(255, 255);
    } else if (value == button_4) {
      carTurnLeft(255, 255);
    } else if (value == button_5) {
      carStop();
    } else if (value == button_6) {
      carTurnRight(255, 255);
    } else if (value == button_8) {
      carBack(255, 255);
    }
    irrecv.resume();
  }
}

void carStop() {                //  Motor Stop
  digitalWrite(speedPin_M2, 0);
  digitalWrite(directionPin_M1, LOW);
  digitalWrite(speedPin_M1, 0);
  digitalWrite(directionPin_M2, LOW);
}

void carTurnLeft(int leftSpeed, int rightSpeed) {       //Turn Left
  analogWrite (speedPin_M2, leftSpeed);             //PWM Speed Control
  digitalWrite(directionPin_M1, LOW);
  analogWrite (speedPin_M1, rightSpeed);
  digitalWrite(directionPin_M2, HIGH);
}

void carTurnRight(int leftSpeed, int rightSpeed) {      //Turn Right
  analogWrite (speedPin_M2, leftSpeed);
  digitalWrite(directionPin_M1, HIGH);
  analogWrite (speedPin_M1, rightSpeed);
  digitalWrite(directionPin_M2, LOW);
}

void carBack(int leftSpeed, int rightSpeed) {           //Move backward
  analogWrite (speedPin_M2, leftSpeed);
  digitalWrite(directionPin_M1, LOW);
  analogWrite (speedPin_M1, rightSpeed);
  digitalWrite(directionPin_M2, LOW);
}
void carAdvance(int leftSpeed, int rightSpeed) {        //Move forward
  analogWrite (speedPin_M2, leftSpeed);
  digitalWrite(directionPin_M1, HIGH);
  analogWrite (speedPin_M1, rightSpeed);
  digitalWrite(directionPin_M2, HIGH);
}