[exemplo] I2C OLED

wip(wip)

(a)	(b)
fig.1

(a)	(b)
fig.2

fig.3

#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>

// OLED display TWI address
#define OLED_ADDR 0x3C
Adafruit_SSD1306 display(-1);
#if (SSD1306_LCDHEIGHT != 64)
#error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

int dummyVal = 0;

void setup() {
  // inicializa ecrã
  display.begin(SSD1306_SWITCHCAPVCC, OLED_ADDR);
  display.clearDisplay();
  display.display();

  // imprime linha de texto
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(55, 30);
  display.print(F("..."));

  // actualiza ecrã
  display.display();
}

void loop() {
  display.clearDisplay();
  display.display();

  display.setTextSize(3);
  display.setTextColor(WHITE);
  display.setCursor(60, 25);

  if (dummyVal == 0) {
    display.print(F("\\"));
  }
  else if (dummyVal == 1) {
    display.print(F("|"));
  }
  else if (dummyVal == 2) {
    display.print(F("/"));
  }
  else if (dummyVal == 3) {
    display.print(F("-"));
  }

  if (dummyVal >= 3) {
    dummyVal = 0;
  }
  else {
    dummyVal = dummyVal + 1;
  }

  display.display();
}