#include <SD.h>
#define pin_cs 5

File fileku, root;

void setup()
{
  Serial.begin(9600);
  if(!SD.begin(pin_cs))
  {
    Serial.println("Mungkin ada masalah dengan Memory Card");
    while(1);   
  }

  buatfile();
  cekisi();
}

void loop()
{
  int adc = analogRead(A0);
  
  isifile(adc);
  delay(1000);

   bacafile();
  delay(1000);
}

void isifile(int nilaiadc)
{
  fileku=SD.open("test.txt",FILE_WRITE);
  if(fileku)
  {
    fileku.println(nilaiadc);
    fileku.close();
  }
  else
  {
    Serial.println("Gagal mengisi file");
    while(1);
  }
}

void bacafile()
{
  fileku=SD.open("test.txt");
  if(fileku)
  {
    while(fileku.available())
    {
      Serial.write(fileku.read());
    }
    fileku.close();
  }
  else
  {
    Serial.println("Gagal membaca file");
    while(1);
  }
}

void cekisi()
{
  root = SD.open("/");
  while(true)
  {
    File cekfile = root.openNextFile();
    if(!cekfile)
    {
      break;
    }
    Serial.print(cekfile.name());
    Serial.print(" ");
    Serial.println(cekfile.size());
    cekfile.close();
  }
}

void buatfile()
{
  
  fileku = SD.open("test.txt", FILE_WRITE);
  if(fileku)
  {
    fileku.println("ini adalah isi file coba 123");
    fileku.close();
  }
    else
    {
      Serial.println("Gagal membuat file");
      while(1);
    }

  fileku = SD.open("test.txt");
  if(fileku)
  {
    while(fileku.available())
    {
      Serial.write(fileku.read());
    }
    fileku.close();
  }
}