#include <SD.h> 
#define pin_cs 4

File fileku,root;
  
void setup() {
  Serial.begin(9600);
  if(!SD.begin(pin_cs))
  {
    Serial.println("Mungkin ada masalah dengan memory card");
    while(1);
  }
  
    buat_file();
 
cekIsiCard();

}

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 cekIsiCard()
{
  root = SD.open("/");
  while(true){

  File cekfile = root.openNextFile();
  if(!cekfile)
  {
    break;
  }

  Serial.print(cekfile.name());
  Serial.print(" ");
  Serial.println(cekfile.size());
  cekfile.close();
  // put your setup code here, to run once:
  }
}


void buat_file()
{
   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);
  }
}