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

// Pin Definitions
#define Low_LED_Pin 12
#define High_LED_Pin 14
#define PIN_TRIG 5
#define PIN_ECHO 17

// WiFi Credentials
const char* WIFI_NAME = "Wokwi-GUEST";
const char* WIFI_PASSWORD = "";

// ThingSpeak Configuration
const int myChannelNumber = 3055774; // Updated Channel ID
const char* myApiKey = "VBPLTZQVDTEQRDVP"; // Updated Write API Key
const char* server = "api.thingspeak.com";

WiFiClient client;

void setup() {
  Serial.begin(115200);

  // Set pin modes
  pinMode(Low_LED_Pin, OUTPUT);
  pinMode(High_LED_Pin, OUTPUT);
  pinMode(PIN_TRIG, OUTPUT);
  pinMode(PIN_ECHO, INPUT);

  // Connect to WiFi
  WiFi.begin(WIFI_NAME, WIFI_PASSWORD);

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

void loop() {
  // Trigger the ultrasonic sensor
  digitalWrite(PIN_TRIG, HIGH);
  delayMicroseconds(10);
  digitalWrite(PIN_TRIG, LOW);

  // Read echo duration
  int duration = pulseIn(PIN_ECHO, HIGH);
  int distance = duration / 58; // Convert to cm

  // Print distance to Serial Monitor
  Serial.print("Distance in CM: ");
  Serial.println(distance);

  // Send data to ThingSpeak
  ThingSpeak.setField(1, distance);
  ThingSpeak.writeFields(myChannelNumber, myApiKey);

  // LED control based on distance
  if (distance < 20) {
    digitalWrite(High_LED_Pin, HIGH);
    digitalWrite(Low_LED_Pin, LOW);
  } else if (distance > 300) {
    digitalWrite(Low_LED_Pin, HIGH);
    digitalWrite(High_LED_Pin, LOW);
  } else {
    digitalWrite(High_LED_Pin, LOW);
    digitalWrite(Low_LED_Pin, LOW);
  }

  delay(1000); // Wait 1 second before next reading