#include <Adafruit_Sensor.h>


#define LEVEL_TRIGGER_PIN 32  // HC-SR04 Trigger pin
#define LEVEL_ECHO_PIN 33     // HC-SR04 Echo pin

#define PUMP_PIN 12           // Pump control pin

long duration;                 // Duration of pulse from HC-SR04
float distance;                // Calculated distance from HC-SR04

void setup() {
  Serial.begin(9600);
  
  // Initialize sensors
  pinMode(LEVEL_TRIGGER_PIN, OUTPUT);
  pinMode(LEVEL_ECHO_PIN, INPUT);
  
  // Initialize output devices
  pinMode(PUMP_PIN, OUTPUT);

  // Turn off all output devices initially
  digitalWrite(PUMP_PIN, LOW);
}

void loop() {
  // Read level sensor (HC-SR04)
  distance = readLevelSensor();

  // Print sensor readings
   Serial.print("Water Level Distance: "); 
   Serial.print(distance); Serial.println(" cm");
  
  // Control logic for output devices
  controlPump(distance);
  
  delay(2000); // Adjust delay as per required sampling rate
}

// Function to read level sensor using HC-SR04
float readLevelSensor() {
  // Trigger the sensor
  digitalWrite(LEVEL_TRIGGER_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(LEVEL_TRIGGER_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(LEVEL_TRIGGER_PIN, LOW);

  // Read the echo pin and calculate distance
  duration = pulseIn(LEVEL_ECHO_PIN, HIGH);
  distance = duration * 0.034 / 2; // Convert time to distance (cm)
  
  return distance;
}

void controlPump(float distance) {
  if (distance > 20) { // Assume distance > 20 cm indicates low water level
    digitalWrite(PUMP_PIN, HIGH);
    Serial.println("Pump ON");
  } else {
    digitalWrite(PUMP_PIN, LOW);
    Serial.println("Pump OFF");
  }
}