#include <LiquidCrystal_I2C_Hangul.h>
#include <WiFi.h>
#include "ThingsBoard.h"

// set the LCD number of columns and rows
int lcdColumns = 16;
int lcdRows = 2;
 
#define lenght 16.0
double percent = 100.0;
unsigned char b;
unsigned int peace;

// set LCD address, number of columns and rows
// if you don't know your display address, run an I2C scanner sketch
LiquidCrystal_I2C_Hangul lcd(0x27, lcdColumns, lcdRows);

// custom charaters
byte p1[8] = {
  0x10,
  0x10,
  0x10,
  0x10,
  0x10,
  0x10,
  0x10,
  0x10};
 
byte p2[8] = {
  0x18,
  0x18,
  0x18,
  0x18,
  0x18,
  0x18,
  0x18,
  0x18};
 
byte p3[8] = {
  0x1C,
  0x1C,
  0x1C,
  0x1C,
  0x1C,
  0x1C,
  0x1C,
  0x1C};
 
byte p4[8] = {
  0x1E,
  0x1E,
  0x1E,
  0x1E,
  0x1E,
  0x1E,
  0x1E,
  0x1E};
 
byte p5[8] = {
  0x1F,
  0x1F,
  0x1F,
  0x1F,
  0x1F,
  0x1F,
  0x1F,
  0x1F};

// WiFi network name and password:
const char* ssid     = "Wokwi-GUEST";
const char* password = "";
const char* token ="Hs5In450J8WbpyB72KJF";
const char* cloud =  "thingsboard.cloud";

WiFiClient espClient;
ThingsBoard tb(espClient);

void setup() {
   Serial.begin(115200);
    delay(100);
    // connecting to a WiFi network
    WiFi.begin(ssid, password);

    while (WiFi.status() != WL_CONNECTED) {
        delay(100);
    }

  lcd.init();
  lcd.backlight();

  lcd.createChar(0, p1);
  lcd.createChar(1, p2);
  lcd.createChar(2, p3);
  lcd.createChar(3, p4);
  lcd.createChar(4, p5);

  // set up the LCD's number of columns and rows:
  lcd.begin(lcdColumns, lcdRows);
  pinMode(32, INPUT);
}
void loop() {
  if (!tb.connected()) {
    // Connect to the ThingsBoard
    Serial.print("Connecting to: ");
    Serial.print(cloud);
    Serial.print(" with token ");
    Serial.println(token);
    if (!tb.connect(cloud, token)) {
      Serial.println("Failed to connect");
      return;
    }
  }

  int val = analogRead(32);
  float volt = val * (5.0 / 4096);
  percent = val/4096.0*100.0;

  Serial.println(val);

  // voltage display
  lcd.setCursor(0, 0);
  Serial.print("Voltage:");
  lcd.print("Voltage:");
  lcd.setCursor(8, 0);
  Serial.print(volt);
  lcd.print(volt);
  lcd.setCursor(12, 0);
  Serial.println("V");
  lcd.print("V");

  // bargraph display
  lcd.setCursor(0,1);
  double a=lenght/100*percent;
  
  // drawing black rectangles on LCD
  if (a>=1) {
    for (int i=1;i<a;i++) {
      lcd.write(4);
      b=i;
    }
    a=a-b;
  }
 
  peace=a*5;
  
  // drawing charater's colums
  switch (peace) {
  case 0:
    break;
  case 1:
    break;
  case 2:
    lcd.write(1);
    break;
  case 3:
    lcd.write(2);
    break;
  case 4:
    lcd.write(3);
    break;
  }
 
  // clearing line
  for (int i =0;i<(lenght-b);i++) {
    lcd.print(" ");
  }

  tb.sendTelemetryFloat("Voltage:", volt);

  tb.loop();
  delay(100);

}