#include <WiFi.h>
#include <ThingSpeak.h>
char ssid[] = "Wokwi-GUEST";
char pass[] = "";
WiFiClient client;
unsigned long myChannelNumber = 3030773;
const char *myWriteAPIKey = "8NP7I4J55NIRJQQ6";
// LDR pin (input)
int LDRPIN = 34;  // GPIO 34 is ADC-capable
// LED pins (outputs)
int LED1 = 21;  
int LED2 = 18;  
int LED3 = 5;   
void setup() {
  Serial.begin(1100);
  WiFi.mode(WIFI_STA);
  // LDR as input
  pinMode(34, INPUT);
  // LEDs as outputs
  pinMode(21, OUTPUT);
  pinMode(18, OUTPUT);
  pinMode(5, OUTPUT);

  // WiFi connection
  WiFi.begin(ssid, pass);
  ThingSpeak.begin(client);
}

void loop() {
  // WiFi reconnection
  if (WiFi.status() != WL_CONNECTED) {
    Serial.print("Connecting to WiFi");
    while (WiFi.status() != WL_CONNECTED) {
      WiFi.begin(ssid, pass);
      Serial.print(".");
      delay(1000);
    }
    Serial.println("\nConnected.");
  }

  // Read LDR value
  int ldrVal = analogRead(34);
  Serial.println("LDR Value: " + String(ldrVal));

  // LED control (all together)
  if (ldrVal > 500) {  // threshold
    digitalWrite(LED1, HIGH);
    digitalWrite(LED2, HIGH);
    digitalWrite(LED3, HIGH);
  } else {
    digitalWrite(LED1, LOW);
    digitalWrite(LED2, LOW);
    digitalWrite(LED3, LOW);
  }

  // Send data to ThingSpeak
  ThingSpeak.setField(1, ldrVal);
  int statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);

  if (statusCode == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.println("Problem writing data. HTTP error code: " + String(statusCode));
  }

  delay(15); // ThingSpeak free account limit
}