NoNoseOnTV . part 2

Et hop voilà le code version 2.

// # Author  : Hugues Lepesant
// # Date    : 24/04/2014
// # Version : 0.2
 
// # URM Code based on Jiang's work from DFRobot
// # Product name:ultrasonic scanner Kit
// # Product SKU:SEN0001
  
// # Description:
// # The Sketch for scanning 180 degree area 4-500cm detecting range
  
// # Connection:
// #       Pin 1 VCC (URM V3.2) -> VCC (Arduino)
// #       Pin 2 GND (URM V3.2) -> GND (Arduino)
// #       Pin 4 PWM (URM V3.2) -> Pin 3 (Arduino)
// #       Pin 6 COMP/TRIG (URM V3.2) -> Pin 5 (Arduino)
// # Pin mode: PWM
// # Working Mode: PWM passive control mode.
// # If it is your first time to use it,please make sure the two jumpers to the right hand
// # side of the device are set to TTL mode. You'll also find a secondary jumper on
// # the left hand side, you must break this connection or you may damage your device.
  
int URPWM=3;        // PWM Output 0-25000us,every 50us represent 1cm
int URTRIG=5;       // PWM trigger pin
 
int pinGreen = 2;
int pinYellow = 6;
int pinRed = 7;

int duration = 1000;
 
int distMinimum = 100; // 100 cm
int distMedium = 150;  // 150 cm
 
boolean up=true;       // create a boolean variable
unsigned long time;    // create a time variable
unsigned long urmTimer = 0; // timer for managing the sensor reading flash rate
  
unsigned int Distance=0;
 
uint8_t EnPwmCmd[4]={0x44,0x22,0xbb,0x01}; // distance measure command
  
void setup() {             // Serial initialization
    Serial.begin(9600);    // Sets the baud rate to 9600
 
    pinMode(pinGreen, OUTPUT);
    digitalWrite(pinGreen, LOW);
     
    pinMode(pinYellow, OUTPUT);
    digitalWrite(pinYellow, LOW);
     
    pinMode(pinRed, OUTPUT);
    digitalWrite(pinRed, LOW);
 
    PWM_Mode_Setup();
}
  
void loop() {
  Distance = PWM_Mode();
  Serial.print("Distance = ");
  Serial.print(Distance);
  Serial.println(" cm");
   
  if ( Distance > distMedium ) {
    digitalWrite(pinGreen, HIGH);
    digitalWrite(pinYellow, LOW);
    digitalWrite(pinRed, LOW);
  }
 
  if ( Distance > distMinimum && Distance < distMedium ) {
    digitalWrite(pinGreen, LOW);
    digitalWrite(pinYellow, HIGH);
    digitalWrite(pinRed, LOW);
  }
 
  if ( Distance < distMinimum ) {
    digitalWrite(pinGreen, LOW);
    digitalWrite(pinYellow, LOW);
    digitalWrite(pinRed, HIGH);
    
    tone(8, 330, duration);
//    noTone(8);
 }
   
  delay(2000);
}
 
  
void PWM_Mode_Setup(){
    pinMode(URTRIG,OUTPUT);       // A low pull on pin COMP/TRIG
    digitalWrite(URTRIG,HIGH);    // Set to HIGH
  
    pinMode(URPWM, INPUT);        // Sending Enable PWM mode command
     
    for (int i=0;i<4;i++) {
        Serial.write(EnPwmCmd[i]);
    }
}
  
int PWM_Mode(){                   // a low pull on pin COMP/TRIG  triggering a sensor reading
    digitalWrite(URTRIG, LOW);
    digitalWrite(URTRIG, HIGH);   // reading Pin PWM will output pulses
      
    unsigned long DistanceMeasured=pulseIn(URPWM,LOW);
      
    if (DistanceMeasured==50000) { // the reading is invalid.
      return 0;
    } else {
        return DistanceMeasured/50; // every 50us low level stands for 1cm
    }
}