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

WiFiClient client;
long myChannelNumber = 2724688;
const char * myWriteAPIKey = "Y1655SIEUI2VTS1R";
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

#define LDR_PIN 25
#define TRIG_PIN 15
#define ECHO_PIN 22
#define PIR_PIN 13
#define LUMINANCE_PIN 23 // Assuming you have a PWM pin for luminance control

#define RELAY1_PIN 4
#define RELAY2_PIN 5
#define RELAY3_PIN 18
#define RELAY4_PIN 19
#define LUMINANCE_CHANNEL 0 // Define a channel for PWM

void setup() {
  Serial.begin(115200);
  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);
  pinMode(PIR_PIN, INPUT);
  pinMode(RELAY1_PIN, OUTPUT);
  pinMode(RELAY2_PIN, OUTPUT);
  pinMode(RELAY3_PIN, OUTPUT);
  pinMode(RELAY4_PIN, OUTPUT);
  pinMode(LUMINANCE_PIN, OUTPUT); // Pin for luminance control

  digitalWrite(RELAY1_PIN, LOW);
  digitalWrite(RELAY2_PIN, LOW);
  digitalWrite(RELAY3_PIN, LOW);
  digitalWrite(RELAY4_PIN, LOW);

  // Setup PWM for luminance control
  ledcSetup(LUMINANCE_CHANNEL, 5000, 8); // 5 kHz, 8-bit resolution
  ledcAttachPin(LUMINANCE_PIN, LUMINANCE_CHANNEL); // Attach the pin to the channel

  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("Connected to WiFi");
  ThingSpeak.begin(client);
}

void loop() {
  float ldrValue = analogRead(LDR_PIN);
  long duration, distance;

  // Ultrasonic sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance = (duration * 0.034 / 2); // Distance in cm

  // PIR sensor
  int pirValue = digitalRead(PIR_PIN);

  // Luminance control based on distance
  if (distance <= 50) {
    ledcWrite(LUMINANCE_CHANNEL, 255); // Full luminance
  } else if (distance <= 100) {
    ledcWrite(LUMINANCE_CHANNEL, 200); // High luminance
  } else if (distance <= 150) {
    ledcWrite(LUMINANCE_CHANNEL, 150); // Medium luminance
  } else if (distance <= 200) {
    ledcWrite(LUMINANCE_CHANNEL, 100); // Low luminance
  } else {
    ledcWrite(LUMINANCE_CHANNEL, 0); // No luminance
  }

  // Relay control based on sensor values
  digitalWrite(RELAY1_PIN, ldrValue < 500 ? HIGH : LOW);
  digitalWrite(RELAY2_PIN, distance < 10 ? HIGH : LOW);
  digitalWrite(RELAY3_PIN, pirValue == HIGH ? HIGH : LOW);

  // Send data to ThingSpeak
  ThingSpeak.setField(1, ldrValue);
  ThingSpeak.setField(2, distance);
  ThingSpeak.setField(3, pirValue);
  if (ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey) == 200) {
    Serial.println("Data sent successfully");
  } else {
    Serial.println("Error sending data");
  }

  // Check for relay control from ThingSpeak
  int relayControlValue = ThingSpeak.readField(myChannelNumber, 4); // Assuming relay control is on field 4
  digitalWrite(RELAY4_PIN, relayControlValue == 1 ? HIGH : LOW);

  delay(20000); // Wait 20 seconds before the next update
}