int t_p=4;
int e_p=16;
float ss=0.034;
long durn;
float dist_cm;

void setup() {
  // put your setup code here, to run once:
  Serial.begin(115200);
  Serial.println("Hello, ESP32!");
  pinMode(t_p,OUTPUT); // sent data
  pinMode(e_p,INPUT); // reseive data
}

void loop() {
  // put your main code here, to run repeatedly:
  digitalWrite(t_p,LOW);
  delayMicroseconds(2);
  digitalWrite(t_p,HIGH);
  delayMicroseconds(2);
  durn=pulseIn(e_p,HIGH);
  dist_cm=durn*ss/2;
  Serial.print("Distanc");
  Serial.print(dist_cm);
  Serial.print("\n");
  delay(1000);
//น.ส.สฐิดา คงมักน้อย ม.4/1 เลขที่15
}