/*
 * This ESP32 code is created by esp32io.com
 *
 * This ESP32 code is released in the public domain
 *
 * For more detail (instruction and wiring diagram), visit https://esp32io.com/tutorials/esp32-ultrasonic-sensor
 */

#define TRIG_PIN 13 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN 14 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin

#define TRIG_PIN1 23 // ESP32 pin GIOP16 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN1 25 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin

#define TRIG_PIN2 18 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN2 19 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin

#define TRIG_PIN3 21 // ESP32 pin GIOP23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN3 22 // ESP32 pin GIOP22 connected to Ultrasonic Sensor's ECHO pin
int distance1;
static int distance2;
static float duration_us, distance_cm;
int sensor1 ()
{
//float duration_us, distance_cm;
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(ECHO_PIN, HIGH);

  // calculate the distance
  distance_cm = 0.017 * duration_us;
return distance_cm; 
  // print the value to Serial Monitor

  delay(500);
}
int sensor2 ()
{
  Serial.println("sensor2");
 //float duration_us, distance_cm;
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(TRIG_PIN1, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN1, LOW);

  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(ECHO_PIN1, HIGH);

  // calculate the distance
  distance_cm = 0.017 * duration_us;
return distance_cm; 
  // print the value to Serial Monitor

  delay(500);
}
void setup() {
  // begin serial port
  Serial.begin (9600);

  // configure the trigger pin to output mode
  pinMode(TRIG_PIN, OUTPUT);
  // configure the echo pin to input mode
  pinMode(ECHO_PIN, INPUT);

    pinMode(TRIG_PIN1, OUTPUT);
  // configure the echo pin to input mode
  pinMode(ECHO_PIN1, INPUT);
}

void loop() {
   distance1 = sensor1() ;
   Serial.println("distance1= ");
   Serial.println(distance1);
   delay (100);

  distance2 = sensor2 () ;
   Serial.println("distance2= ");
   Serial.println(distance2);
   delay (100);
}