// Blynk settings
#define BLYNK_TEMPLATE_ID "TMPL65I2ZV2s7"
#define BLYNK_TEMPLATE_NAME "Smart Sensor"
#define BLYNK_AUTH_TOKEN "JLUWChZihxrEexYr-QVGSxKKLsMlJ4Rh"

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

// Pin definitions
#define LED 23
#define BLYNK_PRINT Serial

const int TRIG_PIN = 13;
const int ECHO_PIN = 12;

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

// Blynk timer
BlynkTimer timer;

// Callback when Blynk is connected
BLYNK_CONNECTED() {
    // Sync virtual pin 5 on connection (V5 is used for the LED control)
    Blynk.syncVirtual(V5);
}

// State variable for the toggle button
bool toggleState_1 = LOW;

// Blynk callback for virtual pin V5
BLYNK_WRITE(V5) {
    // Read the state from the app
    toggleState_1 = param.asInt();
    // Control the LED based on the state
    digitalWrite(LED, toggleState_1 ? HIGH : LOW);
    // Send LED state to Blynk app
    Blynk.virtualWrite(V5, toggleState_1);
}

// Function to send sensor data to Blynk
void sendSensor() {
    // Read sensor data
    float waterLevel = readWaterLevel();
    Serial.println("-----------------------------------");
    Serial.println("Water Level: " + String(waterLevel, 2) + " cm");
    Serial.println("-----------------------------------");

    // Send data to Blynk app
    Blynk.virtualWrite(V0, waterLevel);
    delay(100);
}

// Read distance from sensor and calculate water level
float readWaterLevel() {
    digitalWrite(TRIG_PIN, LOW);
    delayMicroseconds(2);
    digitalWrite(TRIG_PIN, HIGH);
    delayMicroseconds(10);
    digitalWrite(TRIG_PIN, LOW);

    int duration = pulseIn(ECHO_PIN, HIGH);
    float distance = duration * 0.034 / 2;
    float waterLevel = 400 - distance; // Adjust this based on your tank height
    return waterLevel;
}

void setup() {
    // Initialize serial communication
    Serial.begin(9600);

    // Connect to WiFi and Blynk
    Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);

    // Set LED pin as output
    pinMode(LED, OUTPUT);

    // Set ultrasonic sensor pins as output/input
    pinMode(TRIG_PIN, OUTPUT);
    pinMode(ECHO_PIN, INPUT);

    // Set up timer to send sensor data every 2 seconds
    timer.setInterval(2000L, sendSensor);
}

void loop() {
    // Run Blynk tasks
    Blynk.run();
    // Run timer tasks
    timer.run();
    digitalWrite(LED, HIGH);
}