/* hey, this is a simple code to make your arduino read
  the value of a potentiometer and display it in percentage form on
  a 16 X 2 LCD screen. I am pretty new at this so sorry if this code
  is terrible or if i have no idea what i'm talking about in the
  comments.

  the circuit(pasted from examples):

  LCD RS pin to digital pin 12
  LCD Enable pin to digital pin 11
  LCD D4 pin to digital pin 5
  LCD D5 pin to digital pin 4
  LCD D6 pin to digital pin 3
  LCD D7 pin to digital pin 2
  LCD R/W pin to ground
  10K resistor:
  ends to +5V and ground
  wiper to LCD VO pin (pin 3)
  Potentiometer attached to analog input 0

  center pin of the potentiometer to the analog pin
  one side pin (either one) to ground
  the other side pin to +5V

***************************************************************
*/

//#include <LiquidCrystal.h> // include the LCD library
#include <LiquidCrystal.h>
#include <SD.h>

#define CS_PIN 10
const int rs = 12, en = 11, d4 = 5, d5 = 4, d6 = 3, d7 = 2;
LiquidCrystal lcd(rs, en, d4, d5, d6, d7);
const int chipSelect = 10; // Set the chip select pin for your SD card module


int pot1Pin = A0; //Potentiometer 1 input pin
int pot2Pin = A1; //Potentiometer 2 input pin
int pot3Pin = A2; //Potentiometer 3 input pin

int pot1Value1 = 0;
int pot1Value2 = 0; // final display variable
int pot2Value1 = 0;
int pot2Value2 = 0; // final display variable
int pot3Value1 = 0; // final display variable
int pot3Value2 = 0; 
void setup()
{ lcd.begin(16, 2); // lcd rows and columns
  lcd.print("Potentiometer"); // title of sorts

File root;

Serial.begin(9600);

  Serial.print("Initializing SD card... ");

  if (!SD.begin(CS_PIN)) {
    Serial.println("Card initialization failed!");
    while (true);
  }

  Serial.println("initialization done.");

  Serial.println("Files in the card:");
  root = SD.open("/");
  printDirectory(root, 0);
  Serial.println("");
  // Example of reading file from the card:
  File textFile = SD.open("wokwi.txt");
  if (textFile) {
    Serial.print("wokwi.txt: ");
    while (textFile.available()) {
      Serial.write(textFile.read());
    }
    textFile.close();
  } else {
    Serial.println("error opening wokwi.txt!");
  }
}


void loop() {
  // read then divide the input(max 1020 in this case) by 10
  pot1Value1 = analogRead(pot1Pin) / 10;
  pot2Value1 = analogRead(pot2Pin) / 10;
  pot3Value1 = analogRead(pot3Pin) / 10;

  // divide by 1.02 to get percentage
  pot1Value2 = pot1Value1 / 1.02;
  pot2Value2 = pot2Value1 / 1.02;
  pot3Value2 = pot3Value1 / 1.02;


  // set cursor to second row, first column
  lcd.setCursor(0, 1);
  //display final percentage
  lcd.print(pot1Value2);
  //print the percent symbol at the end
  lcd.print("%");

  lcd.setCursor(4, 1);
  lcd.print(pot2Value2);
  lcd.print("%");

  lcd.setCursor(8, 1);
  lcd.print(pot3Value2);
  lcd.print("%");

  //wait 0.1 seconds
  delay(100);
  //wipe the extra characters
  lcd.print(" ");
  delay(1);
}
void printDirectory(File dir, int numTabs) {
  while (true) {

    File entry =  dir.openNextFile();
    if (! entry) {
      // no more files
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      // files have sizes, directories do not
      Serial.print("\t\t");
      Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}
//xxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxxx
/*
#include <SD.h>

#define CS_PIN 10

File root;

void setup() {
  Serial.begin(9600);

  Serial.print("Initializing SD card... ");

  if (!SD.begin(CS_PIN)) {
    Serial.println("Card initialization failed!");
    while (true);
  }

  Serial.println("initialization done.");

  Serial.println("Files in the card:");
  root = SD.open("/");
  printDirectory(root, 0);
  Serial.println("");

  // Example of reading file from the card:
  File textFile = SD.open("wokwi.txt");
  if (textFile) {
    Serial.print("wokwi.txt: ");
    while (textFile.available()) {
      Serial.write(textFile.read());
    }
    textFile.close();
  } else {
    Serial.println("error opening wokwi.txt!");
  }
}

void loop() {
  // nothing happens after setup finishes.
}

void printDirectory(File dir, int numTabs) {
  while (true) {

    File entry =  dir.openNextFile();
    if (! entry) {
      // no more files
      break;
    }
    for (uint8_t i = 0; i < numTabs; i++) {
      Serial.print('\t');
    }
    Serial.print(entry.name());
    if (entry.isDirectory()) {
      Serial.println("/");
      printDirectory(entry, numTabs + 1);
    } else {
      // files have sizes, directories do not
      Serial.print("\t\t");
      Serial.println(entry.size(), DEC);
    }
    entry.close();
  }
}

*/