#include <Arduino.h>
#include <Stepper.h>

// Variables
int pir = 0;
int soil = 0;
int prev_soil= LOW;
int prev_pir = LOW;
const int rotation =100;

// Pin definitions
const int pirPin = 13;
const int buzzer = 19;
const int soilPin = 14;
Stepper motor(rotation, 17, 16);


// LEDC channel and timer configuration
const int ledcChannel = 0;
const int ledcTimer = 1;
const int ledcResolution = 13;
const int frequency = 5000;

void setup() {
  // Set pin modes
  pinMode(soilPin, INPUT);
  pinMode(pirPin, INPUT);
  pinMode(buzzer, OUTPUT);

  // Initialize serial communication
  Serial.begin(115200);
  Serial.println("WELCOME TO SMART CROP PROTECTION AND IRRIGATION SYSTEM SIMULATION");

  // Initialize LEDC peripheral
  ledcSetup(ledcChannel, frequency, ledcResolution);
  ledcAttachPin(buzzer, ledcChannel);
}

void loop() {
  pir = digitalRead(pirPin);  

  if (pir == HIGH) {            
    digitalWrite(buzzer, HIGH); 
    ledcWriteTone(ledcChannel, 500); // start the tone 

    if (prev_pir == LOW) {
      Serial.println("Motion detected!");
      Serial.println("Buzzer ON!");
      prev_pir = HIGH;
    }

    delay(15);

  } else {
    digitalWrite(buzzer, LOW); 
    ledcWriteTone(ledcChannel, 0); // Stop the tone

    if (prev_pir == HIGH) {
      Serial.println("Motion ended!");
      Serial.println("Buzzer OFF!");
      prev_pir = LOW;
    }
  }

  soil = analogRead(soilPin);

  if (soil <= 2000){ // when value soil under 2000
    motor.step(rotation); //start the motor

    if (prev_soil == LOW){
      Serial.print("value soil moisture : ");
      Serial.println(soil);
      Serial.println("Motor ON!");
      prev_soil = HIGH;
    }
  
  delay(10);

  } else{
    motor.step(0); // stop the motor
    
    if(prev_soil == HIGH){
      Serial.print("value soil moisture : ");
      Serial.println(soil);
      Serial.println("Motor OFF!");
      prev_soil = LOW;
    } 
  }
}