#define BLYNK_TEMPLATE_ID "TMPL6_0YVPGWC"
#define BLYNK_TEMPLATE_NAME "samosys"
#define BLYNK_AUTH_TOKEN "yVQSBOPhRlJlSpi4MLAFzP7t1YuiZfbN"

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


// WiFi credentials (Wokwi guest mode WiFi)
char ssid[] = "Wokwi-GUEST"; // Fixed WiFi name in Wokwi
char pass[] = "";            // No password in Wokwi guest mode

// Pins
#define TRIG_PIN 5
#define ECHO_PIN 18
#define RED_LED_DISTANCE 19
#define GREEN_LED_DISTANCE 21
#define TEMP_SENSOR_PIN 34
#define RED_LED_TEMP 22
#define GREEN_LED_TEMP 23

// Variables
float distance_cm;
float temperature_celsius;

// Blynk Virtual Pins
#define VIRTUAL_PIN_DISTANCE V0
#define VIRTUAL_PIN_TEMP V1

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

  pinMode(TRIG_PIN, OUTPUT);
  pinMode(ECHO_PIN, INPUT);

  pinMode(RED_LED_DISTANCE, OUTPUT);
  pinMode(GREEN_LED_DISTANCE, OUTPUT);
  pinMode(RED_LED_TEMP, OUTPUT);
  pinMode(GREEN_LED_TEMP, OUTPUT);

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

void loop() {
  Blynk.run();
  readSensors();
  controlLEDs();
  sendToBlynk();
  delay(500);
}

void readSensors() {
  long duration;
  int temp_adc;

  // Ultrasonic Sensor
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);
  duration = pulseIn(ECHO_PIN, HIGH);
  distance_cm = (duration * 0.0343) / 2;

  // Temperature Sensor
  temp_adc = analogRead(TEMP_SENSOR_PIN);
  temperature_celsius = (temp_adc / 4095.0) * 100.0; // Simplified for demo

  Serial.print("Distance: ");
  Serial.print(distance_cm);
  Serial.print(" cm, ");
  Serial.print("Temperature: ");
  Serial.print(temperature_celsius);
  Serial.println(" °C");
}

void controlLEDs() {
  if (distance_cm < 20) {
    digitalWrite(RED_LED_DISTANCE, HIGH);
    digitalWrite(GREEN_LED_DISTANCE, LOW);
  } else {
    digitalWrite(RED_LED_DISTANCE, LOW);
    digitalWrite(GREEN_LED_DISTANCE, HIGH);
  }

  if (temperature_celsius > 30) {
    digitalWrite(RED_LED_TEMP, HIGH);
    digitalWrite(GREEN_LED_TEMP, LOW);
  } else {
    digitalWrite(RED_LED_TEMP, LOW);
    digitalWrite(GREEN_LED_TEMP, HIGH);
  }
}

void sendToBlynk() {
  Blynk.virtualWrite(VIRTUAL_PIN_DISTANCE, distance_cm);
  Blynk.virtualWrite(VIRTUAL_PIN_TEMP, temperature_celsius);
}