Arduino

#include <IRremote.h>

const int RECV_PIN = 11;
IRrecv irrecv(RECV_PIN);
decode_results results;

const int pingPin = 7; // Trigger Pin of Ultrasonic Sensor
const int echoPin = 6; // Echo Pin of Ultrasonic Sensor

const int motorA = 12;
const int motorB = 13;
const int buzzer = 3;

long distanceThreshold = 0;
long cm = 0;

long readUltrasonicDistance(int triggerPin, int echoPin)
{
  pinMode(triggerPin, OUTPUT);  // Clear the trigger
  digitalWrite(triggerPin, LOW);
  delayMicroseconds(2);
  // Sets the trigger pin to HIGH state for 10 microseconds
  digitalWrite(triggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(triggerPin, LOW);
  pinMode(echoPin, INPUT);
  // Reads the echo pin, and returns the sound wave travel time in microseconds
  return pulseIn(echoPin, HIGH);
}

void setup(){
  Serial.begin(9600);
  irrecv.enableIRIn();
  irrecv.blink13(true);

  pinMode(motorA, OUTPUT);
  pinMode(motorB, OUTPUT);
  pinMode(buzzer, OUTPUT);

  //pinMode(pingPin, OUTPUT);
  //pinMode(echoPin, INPUT);
}

void loop(){

  if (irrecv.decode(&results)){
    Serial.println(results.value, HEX);

    switch(results.value){
      case 0xFD08F7: //"you pressed button 1"
      for(int i = 1; i>0; i--){
        digitalWrite(motorB, HIGH);
        delay(4000);
        digitalWrite(motorB, LOW);
        delay(3000);
      }
      break;
      case 0xFD8877: //"you pressed button 2"
      for(int i = 2; i>0; i--){
        digitalWrite(motorB, HIGH);
        delay(4000);
        digitalWrite(motorB, LOW);
        delay(3000);
      }
      break;
      case 0xFD48B7: //"you pressed button 3"
      for(int i = 3; i>0; i--){
        digitalWrite(motorB, HIGH);
        delay(4000);
        digitalWrite(motorB, LOW);
        delay(3000);
      }
      break;
      case 0xFD28D7: //"you pressed button 4"
      for(int i = 4; i>0; i--){
        digitalWrite(motorB, HIGH);
        delay(4000);
        digitalWrite(motorB, LOW);
        delay(3000);
      }
      break;
      default: ;
    }
    irrecv.resume();
  }

  // set threshold distance to activate the buzzer
  distanceThreshold = 50; //
  // measure the ping time in cm
  cm = 0.01723 * readUltrasonicDistance(7, 6);
  // convert to inches by dividing by 2.54

  if (cm <= distanceThreshold) {
    digitalWrite(motorA, HIGH);
    digitalWrite(buzzer, HIGH);
  } else {
    digitalWrite(motorA, LOW);
    digitalWrite(buzzer, LOW);
  }

  delay(100);

}