#define BLYNK_TEMPLATE_ID "TMPL6WUBUlpoD"
#define BLYNK_TEMPLATE_NAME "weight sensor"
#define BLYNK_AUTH_TOKEN "svFtLaNBnS6utU_YOUOmyRWTE6Acorv5"

#define BLYNK_PRINT Serial

#include <BlynkSimpleEsp32.h>
#include "HX711.h"

// Wi-Fi credentials
char ssid[] = "Wokwi-GUEST";    // Replace with your Wi-Fi SSID
char pass[] = "";               // Replace with your Wi-Fi password

// Pin definitions for HX711
#define DOUT 4  // HX711 data pin
#define PD_SCK 5  // HX711 clock pin

// Pin definitions for buzzer and LED
#define BUZZER 15  // Buzzer connected to pin 15
#define LED 2  // LED connected to pin 2

// HX711 object
HX711 scale;

unsigned long rawvalue, offset, calibRaw;
float calibUnits, scaleFactor;

// Virtual pins for Blynk
#define V6_PIN V6  // Virtual pin for load cell value
#define V7_PIN V7  // Virtual pin for buzzer control

unsigned long ReadCount() {
  unsigned long Count = 0;
  digitalWrite(DOUT, HIGH);  // DOUT=1
  digitalWrite(PD_SCK, LOW);  // PD_SCK=0
  while (digitalRead(DOUT));  // Wait for DOUT to go low (data ready)
  for (byte i = 0; i < 24; i++) {  // Read 24 bits
    digitalWrite(PD_SCK, HIGH);  // PD_SCK=1
    Count = Count << 1;
    digitalWrite(PD_SCK, LOW);  // PD_SCK=0
    if (digitalRead(DOUT)) Count++;
  }
  digitalWrite(PD_SCK, HIGH);  // 25th pulse
  Count = Count ^ 0x800000;
  digitalWrite(PD_SCK, LOW);  // PD_SCK=0
  return Count;
}

void setup() {
  // Initialize serial communication for debugging
  Serial.begin(115200);
  
  // Initialize Blynk
  Blynk.begin(BLYNK_AUTH_TOKEN, ssid, pass);  // Use your Wi-Fi credentials
  
  // Set pin modes for HX711 and other peripherals
  pinMode(DOUT, INPUT);
  pinMode(PD_SCK, OUTPUT);
  pinMode(BUZZER, OUTPUT);  // Set buzzer pin as output
  pinMode(LED, OUTPUT);  // Set LED pin as output
  digitalWrite(BUZZER, LOW);  // Ensure buzzer is off initially
  digitalWrite(LED, LOW);  // Ensure LED is off initially

  // Tare the scale
  offset = 8388608; // Raw value with no load
  
  // Calibration
  calibRaw = 8389028; // Raw value with known weight
  calibUnits = 1.00;  // The known weight in kg
  scaleFactor = (calibRaw - offset) / calibUnits;
  
  // Initial weight reading
  rawvalue = ReadCount();
  Serial.print("raw value: ");
  Serial.println(rawvalue);
}

void loop() {
  // Read weight from the load cell
  rawvalue = ReadCount();
  float weight = (rawvalue - offset) / scaleFactor;
  Serial.print("Raw Value: ");
  Serial.println(rawvalue);
  Serial.print("Weight (Kg): ");
  Serial.println(weight);

  // Send the weight value to Blynk App (V6)
  Blynk.virtualWrite(V6_PIN, weight);

  // Buzzer and LED control based on weight
  if (weight > 1.0) {
    digitalWrite(BUZZER, HIGH);  // Turn on buzzer
    digitalWrite(LED, HIGH);  // Turn on LED
    Blynk.virtualWrite(V7_PIN, 1);  // Send 1 to Blynk to turn on the buzzer
  } else {
    digitalWrite(BUZZER, LOW);  // Turn off buzzer
    digitalWrite(LED, LOW);  // Turn off LED
    Blynk.virtualWrite(V7_PIN, 0);  // Send 0 to Blynk to turn off the buzzer
  }

  // Run Blynk tasks
  Blynk.run();
  
  delay(333);  // Delay before the next loop iteration
}