#define CMDSET 0
#define DISPSET 1
#define DATAOUT 2

#define WAIT 200

char str[] = "0123456789ABCDEF";

void setup()
{
  pinMode(CMDSET, OUTPUT);
  pinMode(DISPSET, OUTPUT);
  pinMode(DATAOUT, OUTPUT);
  
  delay(500);
  SendByte(0, CMDSET); //ノイズ?対策
  SendByte(1, CMDSET);
}

void loop()
{
  for(int i=0; i<16; i++)
  {
    SendByte(str[i], DISPSET);
    delay(100);
  }
  SendByte(0xA, DISPSET);
  delay(1000);
}

void SendByte(byte code, byte port)
{
  for(int i=0; i<8; i++)
  {
    digitalWrite(DATAOUT, (code >> i) & 1);
    digitalWrite(port, LOW);
    delayMicroseconds(WAIT);
    digitalWrite(port, HIGH);
    delayMicroseconds(WAIT);
  }
}