/*
 * 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-servo-motor
 */

#include <ESP32Servo.h>
//#include <ESP32_Button.h>
#include <ezButton.h>
#include <Button.h>

#define TRIG_PIN  23  // ESP32 pin GPIO23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN  22  // ESP32 pin GPIO22 connected to Ultrasonic Sensor's ECHO pin
#define TRIG_PIN1  17  // ESP32 pin GPIO23 connected to Ultrasonic Sensor's TRIG pin
#define ECHO_PIN1  16  // ESP32 pin GPIO22 connected to Ultrasonic Sensor's ECHO pin
#define SERVO_PIN 26  // ESP32 pin GPIO26 connected to Servo Motor's pin
#define SERVO_PIN1 25  // ESP32 pin GPIO26 connected to Servo Motor's pin
#define BUTTON_PIN 27
#define LED_PIN 14
#define BUZZER_PIN 18 // ESP32 GPIO21 pin connected to Buzzer's pin
#define DISTANCE_THRESHOLD  60 // centimeters

Servo servo; // create servo object to control a servo
Servo servo1;
ezButton button(BUTTON_PIN);

// variables will change:
float duration_us, distance_cm, duration_us1, distance_cm1;
int led_state = LOW;    // the current state of LED
// int button_state;       // the current state of button
// int last_button_state;  // the previous state of button



void setup() {
  Serial.begin (9600);       // initialize serial port
  pinMode(LED_PIN, OUTPUT);
  pinMode(BUTTON_PIN, INPUT_PULLUP);
  pinMode(TRIG_PIN, OUTPUT); // set ESP32 pin to output mode
  pinMode(ECHO_PIN, INPUT);  // set ESP32 pin to input mode
  pinMode(TRIG_PIN1, OUTPUT); // set ESP32 pin to output mode
  pinMode(ECHO_PIN1, INPUT);  // set ESP32 pin to input mode
  pinMode(BUZZER_PIN, OUTPUT);
  servo.attach(SERVO_PIN);   // attaches the servo on pin 9 to the servo object
  servo1.attach(SERVO_PIN1);
  servo.write(0);
  servo1.write(0);
  button.setDebounceTime(50);
}

void loop() {
  // generate 10-microsecond pulse to TRIG pin
  digitalWrite(TRIG_PIN, HIGH);
  digitalWrite(TRIG_PIN1, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  digitalWrite(TRIG_PIN1, LOW);

  // digitalWrite(TRIG_PIN1, HIGH);
  // delayMicroseconds(10);
  // digitalWrite(TRIG_PIN1, LOW);

  //last_button_state = button_state;      // save the last state
  //button_state = digitalRead(BUTTON_PIN); // read new state

  // measure duration of pulse from ECHO pin
  duration_us = pulseIn(ECHO_PIN, HIGH);
  duration_us1 = pulseIn(ECHO_PIN1, HIGH);
  // calculate the distance
  distance_cm = 0.017 * duration_us;
  distance_cm1 = 0.017 * duration_us1;

  button.loop();

  if ((distance_cm  < DISTANCE_THRESHOLD) && (distance_cm1 < DISTANCE_THRESHOLD)){
    servo.write(90);
    servo1.write(90);
    digitalWrite(BUZZER_PIN, HIGH);
    digitalWrite(LED_PIN, HIGH);
    // if (button.isPressed()){
    //   if(led_state == LOW){
    //     led_state = HIGH;
    //     digitalWrite(LED_PIN, led_state);
    //     servo.write(90);
    //     servo1.write(90);
    //   }else{
    //     led_state = LOW;
    //     digitalWrite(LED_PIN, led_state);
    //     servo.write(90);
    //     servo1.write(90);
    //   }
    // }
  }
  else{
    if (button.isPressed()){
      if(led_state == LOW){
        led_state = HIGH;
        //digitalWrite(LED_PIN, led_state);
        servo.write(90);
        servo1.write(90);
        digitalWrite(BUZZER_PIN, HIGH);
      }else{
        led_state = LOW;
        //digitalWrite(LED_PIN, led_state);
        servo.write(0);
        servo1.write(0);
        digitalWrite(BUZZER_PIN, LOW);
      }
      digitalWrite(LED_PIN, led_state);
    } else {
      servo.write(0);
      servo1.write(0);
      digitalWrite(BUZZER_PIN, LOW);
      digitalWrite(LED_PIN, LOW);
    }
  } 
  // print the value to Serial Monitor
  // Serial.print("distance: ");
  // Serial.print(distance_cm);
  // Serial.println(" cm");

  delay(500);
}