#define BLYNK_TEMPLATE_ID "TMPL3r8i4Lxyl"
#define BLYNK_TEMPLATE_NAME "FINALBOSS IotT Traffic unfinished"
#define BLYNK_AUTH_TOKEN "FzTVXznK2WtKo-qieaPWP81d8jvv4SwD"

#include <Arduino.h>
#include <WiFi.h>
#include <WiFiClient.h>
#include <BlynkSimpleEsp32.h>

#define BLYNK_PRINT Serial

char ssid[] = "wokwi-GUEST";
char pass[] = "";

int redPin = 27;
int greenPin = 14;
int yellowPin = 12;

// Define ultrasonic sensor pins
int trigPin = 18;
int echoPin = 5;

// Define pedestrian button pin
int buzzerButtonPin = 19;
int irPin = 17;

#define SWITCH_TIME 5000
BlynkTimer timer;

void setup() {
  pinMode(redPin, OUTPUT);
  pinMode(greenPin, OUTPUT);
  pinMode(yellowPin, OUTPUT);

  // Set ultrasonic sensor pins
  pinMode(trigPin, OUTPUT);
  pinMode(echoPin, INPUT);

  // Set pedestrian button pin as INPUT with internal pull-up resistor
  pinMode(buzzerButtonPin, OUTPUT);
  pinMode(irPin, OUTPUT);

  Serial.begin(9600);
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);
}

void loop() {
  Blynk.run();
  timer.run();

  long duration, distance ;

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

  duration = pulseIn(echoPin, HIGH);
  distance = duration * 0.034 / 2;

  Serial.print("Distance: ");
  Serial.print(distance );
  Serial.println(" cm");
  
  delay(1000);

  int trafficDensity = map(distance, 2, 397, 1000, 0);

  if (trafficDensity >= 50) {
    showRedLight();
  } else {
    showGreenLight();
  }
}
void showRedLight() {
  // Set RGB LED to red
  digitalWrite(redPin, HIGH);
  digitalWrite(greenPin, LOW);
  digitalWrite(yellowPin, LOW);
  delay(SWITCH_TIME);  // 5 seconds
}

void showGreenLight() {
  // Set RGB LED to green
  digitalWrite(redPin, LOW);
  digitalWrite(greenPin, HIGH);
  digitalWrite(yellowPin, LOW);
  delay(SWITCH_TIME);  // 5 seconds
}

void showYellowLight() {
  // Set RGB LED to yellow
  digitalWrite(redPin, LOW);
  digitalWrite(greenPin, LOW);
  digitalWrite(yellowPin, HIGH);
  delay(SWITCH_TIME);  // 5 seconds
}