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

const int LM35Pin = 34;
const int ldrPin = 35;
const int trig = 5;
const int echo = 18;
const int led = 2; 

const char* ssid = "Wokwi-GUEST";
const char* pass = "";

unsigned long myChannelNumber = 1234567;
const char* myAPIKey = "YOUR_API_KEY"; 

WiFiClient client;
float pingTime, targetDistance;

void setup() {
  Serial.begin(9600);
  pinMode(ldrPin, INPUT);
  pinMode(led, OUTPUT);
  pinMode(trig, OUTPUT);
  pinMode(echo, INPUT);

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

  ThingSpeak.begin(client);
}

void loop() {
  int ldrValue = digitalRead(ldrPin);

  digitalWrite(trig, LOW);
  delayMicroseconds(2);
  digitalWrite(trig, HIGH);
  delayMicroseconds(10);
  digitalWrite(trig, LOW);

  pingTime = pulseIn(echo, HIGH);
  targetDistance = (pingTime * 0.0343) / 2;

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

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

  ThingSpeak.setField(1, targetDistance);
  ThingSpeak.setField(2, ldrValue);

  int status = ThingSpeak.writeFields(myChannelNumber, myAPIKey);
  if (status == 200) {
    Serial.println("Channel update successful!");
  } else {
    Serial.println("Error updating channel. HTTP error code: " + String(status));
  }

  delay(15000);
}