#include <WiFi.h>
#include <ThingSpeak.h>

const char* ssid = "Wokwi-GUES"; // Replace with your WiFi SSID
const char* password = " "; // Replace with your WiFi password
const char* thingSpeakApiKey = "6OOO18J9FKBKAU8A"; // Replace with your ThingSpeak API Key
const long myChannelNumber = 2326409; // Replace with your ThingSpeak Channel Number

WiFiClient client;

// Pin assignments
const int pirSensorPin = 23;         // Pin connected to PIR motion sensor
const int ultrasonicTriggerPin = 33;  // Pin connected to Ultrasonic sensor trigger
const int ultrasonicEchoPin = 12;     // Pin connected to Ultrasonic sensor echo
const int switchRelayPin = 26;
int pirState = LOW;
int val = 0; // Pin connected to the switch relay

// Variables
bool isMotionDetected = false; // Flag to track motion detection

void setup() {
  // Initialize pins
  pinMode(pirSensorPin, INPUT);
  pinMode(ultrasonicTriggerPin, OUTPUT);
  pinMode(ultrasonicEchoPin, INPUT);
  pinMode(switchRelayPin, OUTPUT);
  digitalWrite(switchRelayPin, LOW); // Turn off the switch initially

  // Initialize Wi-Fi
  WiFi.begin(ssid, password);
  while (WiFi.status() != WL_CONNECTED) {
    delay(1000);
    Serial.println("Connecting to WiFi...");
  }
  Serial.println("Connected to WiFi");

  // Initialize ThingSpeak
  ThingSpeak.begin(client);
}

void loop() {
  // Check PIR motion sensor
  val = digitalRead(pirSensorPin); // read input value
  if (val == HIGH) {
    // ... Your existing code for motion detection
  }

  // Check Ultrasonic sensor
  int distance = measureDistance();

  // Update ThingSpeak with the sensor data
  ThingSpeak.writeField(myChannelNumber, 1, distance, thingSpeakApiKey);
  ThingSpeak.writeField(myChannelNumber, 2, isMotionDetected, thingSpeakApiKey);

  // Control switch based on motion and distance
  if (isMotionDetected || distance <= 100) {
    digitalWrite(switchRelayPin, LOW); // Turn on the switch
  } else {
    digitalWrite(switchRelayPin, HIGH); // Turn off the switch
  }
}

int measureDistance() {
  // Send a pulse to the Ultrasonic sensor
  digitalWrite(ultrasonicTriggerPin, LOW);
  delayMicroseconds(2);
  digitalWrite(ultrasonicTriggerPin, HIGH);
  delayMicroseconds(10);
  digitalWrite(ultrasonicTriggerPin, LOW);

  // Measure the duration of the pulse
  long duration = pulseIn(ultrasonicEchoPin, HIGH);

  // Calculate the distance based on the speed of sound (343 m/s or 0.0343 cm/µs)
  int distance = duration * 0.0343 / 2;

  return distance;
}