#define BLYNK_TEMPLATE_ID "TMPL3E8Dvkbk2"
#define BLYNK_TEMPLATE_NAME "smart traffic"
#define BLYNK_AUTH_TOKEN "NnLmjH3lXWyrxLZGyH_tC8hLDjP3tXEM"
#include <Arduino.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

// WiFi credentials
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Blynk authentication token
char auth[] ="NnLmjH3lXWyrxLZGyH_tC8hLDjP3tXEM";

// Define LED pins for Lane 1
const int greenLED_lane1 = 14;
const int yellowLED_lane1 = 25;
const int redLED_lane1 = 34;

// Define LED pins for Lane 2
const int greenLED_lane2 = 15;
const int yellowLED_lane2 = 16;
const int redLED_lane2 = 18;

// Define potentiometer pin
const int potPin = 0;

// Virtual pin for indication LED in Blynk
#define INDICATION_LED_VIRTUAL_PIN V0

void setup() {
  // Initialize the LED pins as outputs for Lane 1
  pinMode(greenLED_lane1, OUTPUT);
  pinMode(yellowLED_lane1, OUTPUT);
  pinMode(redLED_lane1, OUTPUT);

  // Initialize the LED pins as outputs for Lane 2
  pinMode(greenLED_lane2, OUTPUT);
  pinMode(yellowLED_lane2, OUTPUT);
  pinMode(redLED_lane2, OUTPUT);

  // Initialize serial communication
  Serial.begin(9600);

  // Attempt to connect to WiFi
  WiFi.begin(ssid, pass);
  while (WiFi.status() != WL_CONNECTED) {
    delay(500);
    Serial.print(".");
  }

  // Initialize Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

  // Initial condition: Lane 1 is green, Lane 2 is red
  digitalWrite(greenLED_lane1, HIGH);
  digitalWrite(yellowLED_lane1, LOW);
  digitalWrite(redLED_lane1, LOW);
  
  digitalWrite(greenLED_lane2, LOW);
  digitalWrite(yellowLED_lane2, LOW);
  digitalWrite(redLED_lane2, HIGH);
}

void loop() {
  // Read the value from the potentiometer
  int potValue = analogRead(potPin);
  
  // Map the potentiometer value to LED brightness (0-255)
  int brightness = map(potValue, 0, 4095, 0, 255);
  
  // Determine LED status for Lane 1 based on potentiometer value
  if (potValue < 1365) { // Less than 1/3 of the potentiometer range
    // Green light - No congestion for Lane 1
    digitalWrite(greenLED_lane1, HIGH);
    digitalWrite(yellowLED_lane1, LOW);
    digitalWrite(redLED_lane1, LOW);

    // Red light - Heavy congestion for Lane 2
    digitalWrite(greenLED_lane2, LOW);
    digitalWrite(yellowLED_lane2, LOW);
    digitalWrite(redLED_lane2, HIGH);

    // Indication LED ON in Blynk when Lane 1 is red
    Blynk.virtualWrite(INDICATION_LED_VIRTUAL_PIN, HIGH);
  } else if (potValue >= 1365 && potValue < 2730) { // Between 1/3 and 2/3 of the potentiometer range
    // Yellow light - Moderate congestion for both lanes
    digitalWrite(greenLED_lane1, LOW);
    digitalWrite(yellowLED_lane1, HIGH);
    digitalWrite(redLED_lane1, LOW);

    digitalWrite(greenLED_lane2, LOW);
    digitalWrite(yellowLED_lane2, HIGH);
    digitalWrite(redLED_lane2, LOW);

    // Indication LED OFF in Blynk when Lane 1 is not red
    Blynk.virtualWrite(INDICATION_LED_VIRTUAL_PIN, LOW);
  } else { // Greater than 2/3 of the potentiometer range
    // Red light - Heavy congestion for Lane 1
    digitalWrite(greenLED_lane1, LOW);
    digitalWrite(yellowLED_lane1, LOW);
    digitalWrite(redLED_lane1, HIGH);

    // Green light - No congestion for Lane 2
    digitalWrite(greenLED_lane2, HIGH);
    digitalWrite(yellowLED_lane2, LOW);
    digitalWrite(redLED_lane2, LOW);

    // Indication LED OFF in Blynk when Lane 1 is not red
    Blynk.virtualWrite(INDICATION_LED_VIRTUAL_PIN, LOW);
  }

  // Run Blynk
  Blynk.run();

  // Delay for smoother transitions (adjust as needed)
  delay(100);
}