#define BLYNK_TEMPLATE_NAME "Water Allowance System"
#define BLYNK_TEMPLATE_ID "TMPL3Sjl0R_dk"
#define BLYNK_AUTH_TOKEN "dqi3VKmWkWGsKH3S9JBPgmYDXv0idDPX"

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

char auth[] = BLYNK_AUTH_TOKEN;
char ssid[] = "Wokwi-GUEST";
char pass[] = "";

// Ultrasonic sensor pins
#define TRIG_PIN 5
#define ECHO_PIN 18

// LEDs
#define RED_LED    22  // Low level
#define BLUE_LED   21   // Mid level
#define GREEN_LED  19   // High level

// Buzzer
#define BUZZER     14



void setup() {
  Serial.begin(115200);
  Blynk.begin(auth, ssid, pass);

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

  pinMode(RED_LED, OUTPUT);
  pinMode(BLUE_LED, OUTPUT);
  pinMode(GREEN_LED, OUTPUT);
  pinMode(BUZZER, OUTPUT);

  digitalWrite(BUZZER, LOW);
}

float readDistanceCM() {
  digitalWrite(TRIG_PIN, LOW);
  delayMicroseconds(2);
  digitalWrite(TRIG_PIN, HIGH);
  delayMicroseconds(10);
  digitalWrite(TRIG_PIN, LOW);

  unsigned long duration = pulseIn(ECHO_PIN, HIGH, 30000UL);
  if (duration == 0) return -1.0; // No echo
  return duration / 58.0; // Convert to cm
}

void loop() {
  Blynk.run();

  float distance = readDistanceCM();
  Serial.print("Water distance: ");
  Serial.print(distance);
  Serial.println(" cm");

  bool lowState = false;
  bool midState = false;
  bool highState = false;

  
  if (distance >= 200) {
  digitalWrite(GREEN_LED, HIGH);
  digitalWrite(BLUE_LED, LOW);
  digitalWrite(RED_LED, LOW);
  digitalWrite(BUZZER, LOW);
  Blynk.virtualWrite(V0, 1);
  Blynk.virtualWrite(V1, 1);
  Blynk.virtualWrite(V2, 1);
} 
else if (distance >= 100 && distance < 200) {
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(BLUE_LED, HIGH);
  digitalWrite(RED_LED, LOW);
  digitalWrite(BUZZER, LOW);
  Blynk.virtualWrite(V0, 1);
  Blynk.virtualWrite(V1, 1);
  Blynk.virtualWrite(V2, 0);
} 
else if (distance < 100) {
  digitalWrite(GREEN_LED, LOW);
  digitalWrite(BLUE_LED, LOW);
  digitalWrite(RED_LED, HIGH);
  digitalWrite(BUZZER, HIGH);
  Blynk.virtualWrite(V0, 1);
  Blynk.virtualWrite(V1, 0);
  Blynk.virtualWrite(V2, 0);
}
  
else
{
  Blynk.virtualWrite(V0, 0);
  Blynk.virtualWrite(V1, 0);
  Blynk.virtualWrite(V2, 0);
  }
  
  

  delay(500);
}