#include <Wire.h>
#include "SSD1306Ascii.h"
#include "SSD1306AsciiWire.h"

#define I2C_ADDRESS 0x3C
#define CLOCK 2
#define PIN1 3
#define PIN2 4
 
SSD1306AsciiWire oled;

int counter = 0;
char dat = 0;

void setup() {
  pinMode(CLOCK, INPUT);
  pinMode(PIN1, INPUT);
  pinMode(PIN2, INPUT);
  
  Wire.begin();
  Wire.setClock(400000L);

  oled.begin(&Adafruit128x64, I2C_ADDRESS);

  oled.setFont(System5x7);
  oled.clear();
}

void loop() {
  char c;

  c = 0;
  while(digitalRead(CLOCK) == LOW);
  if(digitalRead(PIN1) == HIGH)
    c = 1;
  if(digitalRead(PIN2) == HIGH)
    c += 2;
  dat = dat + (c << counter);
  counter += 2;
  if(counter == 8)
  {
    oled.print(dat);
    dat = 0;
    counter = 0;
  }
  while(digitalRead(CLOCK) == HIGH);
}