#include <TinyWireM.h>

#include <Tiny4kOLED.h>

// ============================================================================

const int dataPin = 1;   /* Q7 */
const int clockPin = 3;  /* CP */
const int latchPin = 4;  /* PL */

const int numBits = 8;

void setup() {
  oled.begin();
  oled.setFont(FONT8X16);

  pinMode(dataPin, INPUT);
  pinMode(clockPin, OUTPUT);
  pinMode(latchPin, OUTPUT);
}

void loop() {
  //oled.clear();
  oled.setCursor(0, 1);
  digitalWrite(latchPin, LOW);
  digitalWrite(latchPin, HIGH);

  // Step 2: Shift
  for (int i = 0; i < numBits; i++) {
    int bit = digitalRead(dataPin);
    if (bit == HIGH) {
      oled.print("1");
    } else {
      oled.print("0");
    }
    digitalWrite(clockPin, HIGH); // Shift out the next bit
    digitalWrite(clockPin, LOW);
  }

  oled.on();
  delay(1);
}