#define BLYNK_TEMPLATE_ID "TMPL3OqcwE5r2"
#define BLYNK_TEMPLATE_NAME "smart cattle monitoring system "
#define BLYNK_AUTH_TOKEN "Your Auth Token"
#include <LiquidCrystal.h>

// Define LCD pins
LiquidCrystal lcd(14, 27, 26, 25, 33, 32);

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

// Define buzzer pin
const int buzzerPin = 19;

// Seven Segment Display Pins
const int segmentPins[7] = {15, 4, 16, 17, 21, 22, 23};

// Segment patterns for numbers 0-9 (common cathode)
const byte numPatterns[10] = {
  0b00111111, // 0
  0b00000110, // 1
  0b01011011, // 2
  0b01001111, // 3
  0b01100110, // 4
  0b01101101, // 5
  0b01111101, // 6
  0b00000111, // 7
  0b01111111, // 8
  0b01101111  // 9
};

void setup() {
  // Initialize LCD
  lcd.begin(16, 2);
  lcd.print("Cattle Monitor");

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

  // Initialize buzzer pin
  pinMode(buzzerPin, OUTPUT);

  // Initialize seven segment display pins
  for (int i = 0; i < 7; i++) {
    pinMode(segmentPins[i], OUTPUT);
  }

  // Start serial communication for debugging
  Serial.begin(115200);
}

void loop() {
  // Measure distance using the ultrasonic sensor
  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;

  // Display distance on LCD
  lcd.setCursor(0, 1);
  lcd.print("Dist: ");
  lcd.print(distance);
  lcd.print(" cm ");

  // Display distance on seven segment display
  displayNumber(distance);

  // Sound the buzzer if distance is less than a threshold
  if (distance < 50) { // example threshold
    digitalWrite(buzzerPin, HIGH);
  } else {
    digitalWrite(buzzerPin, LOW);
  }

  // Small delay before next reading
  delay(500);
}

void displayNumber(int num) {
  if (num > 99) num = 99; // Limit to two digits for seven segment display

  // Display tens digit
  int tens = num / 10;
  int units = num % 10;

  // Display tens digit
  displayDigit(tens);

  delay(1000); // Delay for visibility, adjust as needed

  // Display units digit
  displayDigit(units);

  delay(1000); // Delay for visibility, adjust as needed
}

void displayDigit(int digit) {
  byte pattern = numPatterns[digit];

  for (int i = 0; i < 7; i++) {
    digitalWrite(segmentPins[i], bitRead(pattern, i));
  }
}