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

const char* ssid = "Wokwi-GUEST";
const char* pass = ""; 
const unsigned long myChannelNumber = 3043760;
const char* myWriteAPIKey = "7Q3AXO8MHZCVZ513";

int led = 18, trigPin = 5, echoPin = 19, ldr = 17;
float pingTime, targetDistance;
WiFiClient client;

void connectWiFi() {
  Serial.print("Connecting to WiFi");
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }
  Serial.println("\nWiFi connected!");
}

void setup() {
  Serial.begin(9600);
  pinMode(led, OUTPUT);
  pinMode(trigPin, OUTPUT);
  pinMode(ldr, INPUT);
  pinMode(echoPin, INPUT);

  connectWiFi();
  ThingSpeak.begin(client);
}

void loop() {
  if (WiFi.status() != WL_CONNECTED) {
    connectWiFi();
  }

  int ldrValue = digitalRead(ldr);

  digitalWrite(trigPin, LOW); 
  delayMicroseconds(2); 
  digitalWrite(trigPin, HIGH); 
  delayMicroseconds(10); 
  digitalWrite(trigPin, LOW); 
  delayMicroseconds(15);  
  pingTime = pulseIn(echoPin, HIGH); 
  targetDistance = (pingTime * 0.0343) / 2; 

  Serial.print("Distance: ");
  Serial.print(targetDistance);
  Serial.println(" cm");
  Serial.print("LDR Value: ");
  Serial.println(ldrValue);

  if ((targetDistance <= 100) && (ldrValue == 0)) {
    digitalWrite(led, HIGH);
  } else {
    digitalWrite(led, LOW);
  }

  ThingSpeak.setField(2, Light);

  int statusCode = ThingSpeak.writeFields(myChannelNumber, myWriteAPIKey);
  if (statusCode == 200) {
    Serial.println("Channel update successful.");
  } else {
    Serial.print("Problem writing data. HTTP error code: ");
    Serial.println(statusCode);
  }

  delay(1000);
}