int trigPin=12;
int echoPin=11;
int PTT;

void setup() {
  // put your setup code here, to run once:

pinMode(trigPin,OUTPUT);
pinMode(echoPin,INPUT);
Serial.begin(9600);
}
 
void loop() {
  // put your main code here, to run repeatedly:
digitalWrite(trigPin,LOW);
delayMicroseconds(10);
digitalWrite(trigPin,HIGH);
delayMicroseconds(10);
digitalWrite(trigPin,LOW);
PTT=pulseIn(echoPin,HIGH);
delay(25);
Serial.println(PTT);
}