#include <SD.h>
#define pin_cs 4

File fileIlham,root;

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

buatFile();



 
  cekIsiCard();
}
 



void loop() {
 int adc = analogRead(A0);
  isiFile(adc);

  delay(1000);
  bacaFile();
  delay(1000);

  // put your main code here, to run repeatedly:

}


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

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

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

  File cekfile = root.openNextFile();
  if(!cekfile)
  {
    break;
  }
  Serial.println(cekfile.name());
  Serial.print(" ");
  Serial.println(cekfile.size());
  cekfile.close();

  }
}

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