int trig = 2; 
int echo = 3; 
int T;
int d ;
int d2 ;
int p ;
void setup() {
  // put your setup code here, to run once:
pinMode(trig , OUTPUT);
pinMode(echo ,INPUT);
Serial.begin(9600);

}

void loop() {
digitalWrite( trig , 0);
delayMicroseconds(2);
digitalWrite( trig , 1);
delayMicroseconds(10);
digitalWrite( trig , 0);
T= pulseIn(echo ,1);
d= 0.034*T/2; 
d2= constrain(d,0,9);
p = map(d2,0, 9 , 0 ,100);
Serial.println(p);
delay(300);


}