#include <DHT.h>
#include <Servo.h>

#define DHTPIN 2          // DHT22 data pin
#define DHTTYPE DHT22     // Define the DHT sensor type
DHT dht(DHTPIN, DHTTYPE);

#define TRIGPIN 2        // Ultrasonic sensor Trig pin
#define ECHOPIN 4         // Ultrasonic sensor Echo pin
#define PIRPIN 5          // PIR sensor pin
#define BUZZERPIN 15      // Buzzer pin
#define SERVOPIN 17        // Servo motor pin

Servo servo;              // Create a servo object

int phPin = A0;           // Analog pin for pH sensor
float phValue = 0.0;

void setup() {
  pinMode(TRIGPIN, OUTPUT);
    pinMode(ECHOPIN, INPUT);
      pinMode(PIRPIN, INPUT);
        pinMode(BUZZERPIN, OUTPUT);

          servo.attach(SERVOPIN);
            servo.write(0);         // Start servo at 0 degrees

              dht.begin();
                Serial.begin(9600);
                }

                void loop() {
                  // Read distance from ultrasonic sensor
                    long duration;
                      float distance;
                        digitalWrite(TRIGPIN, LOW);
                          delayMicroseconds(2);
                            digitalWrite(TRIGPIN, HIGH);
                              delayMicroseconds(10);
                                digitalWrite(TRIGPIN, LOW);
                                  duration = pulseIn(ECHOPIN, HIGH);
                                    distance = (duration / 2.0) * 0.0343;

                                      // Read motion from PIR sensor
                                        bool motionDetected = digitalRead(PIRPIN);

                                          // Read pH sensor
                                            phValue = analogRead(phPin) * (14.0 / 1023.0);

                                              // Print values for debugging
                                                Serial.print("Distance: ");
                                                  Serial.print(distance);
                                                    Serial.print(" cm, pH: ");
                                                      Serial.print(phValue);
                                                        Serial.print(", Motion: ");
                                                          Serial.println(motionDetected ? "Yes" : "No");

                                                            // Logic for buzzer
                                                              if (motionDetected && distance == 300) {
                                                                  digitalWrite(BUZZERPIN, HIGH);
                                                                    } else {
                                                                        digitalWrite(BUZZERPIN, LOW);
                                                                          }

                                                                            // Logic for servo
                                                                              if (distance == 200 && phValue > 9.0) {
                                                                                  servo.write(90);  // Open servo to 90 degrees
                                                                                    } else {
                                                                                        servo.write(0);   // Close servo to 0 degrees
                                                                                          }

                                                                                            delay(500);  // Delay for sensor stabilization
                                                                                            }