#include <Servo.h>
Servo servo1;
const int trigPin = 12;
const int echoPin = 11;
long duration;
int distance = 0;
int potPin = A0;
int soil = 0;
int fsoil;
int maxDryValue = 1; //this value decides how much humidity require to treat waste as wet object
int Ultra_Distance = 15; //set Distance between Ultrasonic and moisture(soil) sensor in cm
void setup()
{
  Serial.begin(9600);
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);
  servo1.attach(8);
  Serial.println("Soil Sensor Ultrasonic Servo");
}
void loop()
{
  int soil = 0;
  for (int i = 0; i < 2; i++)
  {
    digitalWrite(trigPin, LOW);
    delayMicroseconds(7);
    digitalWrite(trigPin, HIGH);
    delayMicroseconds(10);
    digitalWrite(trigPin, LOW);
    delayMicroseconds(10);
    duration = pulseIn(echoPin, HIGH);
    distance = duration * 0.034 / 2 + distance;
    delay(10);

  }
  distance = distance / 2;

  if (distance < Ultra_Distance && distance > 1)
  {
    delay(1000);
    for (int i = 0; i < 3; i++)
    {
      soil = analogRead(potPin) ;
      soil = constrain(soil, 485, 1023);
      fsoil = (map(soil, 485, 1023, 100, 0)) + fsoil;
      delay(75);
    }
    fsoil = fsoil / 3;

    Serial.print("Humidity: ");
    Serial.print(fsoil);
    Serial.print("%"); Serial.print(" Distance: "); Serial.print(distance); Serial.print(" cm");
    if (fsoil > maxDryValue)
    { delay(1000);
      Serial.println(" ==>WET Waste ");
      servo1.write(170);
      delay(3000);
    }
    else {
      delay(1000);
      Serial.println(" ==>Dry Waste ");
      servo1.write(10);
      delay(3000);
    }

    servo1.write(90);
  }
  distance = 0;
  fsoil = 0; delay(1000);
}