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• Arduino Sketch

  Hari Wiguna • 10/17/2015 at 19:09 • 0 comments

  //
  // Happy Halloween
  // by Hari Wiguna 2015
  //
  // 01 - modify to work with Chinese knockoff
  // 02 - Draw Happy Halloween & Pumpkin Face
  
  // Wiring:
  // Arduino A4 --> OLED SDA
  // Arduino A5 --> OLED SCL
  // Arduino D2 --> OLED VCC
  // Arduino Gnd--> OLED Gnd
  //
  // Potentiometers are on Gnd and +5V, wipers go to A0, A2, A2
  
  /*********************************************************************
  This is an example for our Monochrome OLEDs based on SSD1306 drivers
  
    Pick one up today in the adafruit shop!
    ------> http://www.adafruit.com/category/63_98
  
  This example is for a 128x64 size display using I2C to communicate
  3 pins are required to interface (2 I2C and one reset)
  
  Adafruit invests time and resources providing this open source code,
  please support Adafruit and open-source hardware by purchasing
  products from Adafruit!
  
  Written by Limor Fried/Ladyada  for Adafruit Industries.
  BSD license, check license.txt for more information
  All text above, and the splash screen must be included in any redistribution
  *********************************************************************/
  
  #include <SPI.h>
  #include <Wire.h>
  #include <Adafruit_GFX.h>
  #include <Adafruit_SSD1306.h>
  
  #define OLED_RESET 4
  Adafruit_SSD1306 display(OLED_RESET);
  
  int prevEyeSize = -1;
  int prevEyeRotation = 0;
  int prevMouthWidth = -1;
  int eyeSep = 2;
  int headR = 50;
  
  #define LOGO16_GLCD_HEIGHT 16
  #define LOGO16_GLCD_WIDTH  16
  static const unsigned char PROGMEM logo16_glcd_bmp[] =
  { B00000000, B11000000,
    B00000001, B11000000,
    B00000001, B11000000,
    B00000011, B11100000,
    B11110011, B11100000,
    B11111110, B11111000,
    B01111110, B11111111,
    B00110011, B10011111,
    B00011111, B11111100,
    B00001101, B01110000,
    B00011011, B10100000,
    B00111111, B11100000,
    B00111111, B11110000,
    B01111100, B11110000,
    B01110000, B01110000,
    B00000000, B00110000
  };
  
  #if (SSD1306_LCDHEIGHT != 64)
  #error("Height incorrect, please fix Adafruit_SSD1306.h!");
  #endif
  
  void setup()   {
    // This is a hack to get my Chinese OLED to work.
    // I power the OLED using D2 because my OLED does not have a reset pin.
    // Without this hack, my oled displays static random dots.
    pinMode(2, OUTPUT);
    digitalWrite(2, LOW);
    delay(100);
    digitalWrite(2, HIGH);
  
    // by default, we'll generate the high voltage from the 3.3v line internally! (neat!)
    display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3D (for the 128x64)
    display.clearDisplay();
  }
  
  void loop() {
    int eyeSize = map(analogRead(A0), 0, 1023, 0, display.height() / 2);
    int eyeRotation = map(analogRead(A1), 0, 1023, 0, 360);
    int mouthWidth = map(analogRead(A2), 0, 1023, 0, display.width() / 2);
  
    if (eyeSize != prevEyeSize || eyeRotation != prevEyeRotation || mouthWidth != prevMouthWidth)
    {
      display.setTextColor(WHITE);
      display.setCursor(8, 0);
      display.setTextSize(2);
      display.println("Halloween!");
  
      //-- Head --
      display.drawCircle(display.width() / 2, display.height() / 2, headR, WHITE);
  
      //-- Left Eye --
      DrawEye(display.width() / 2 - prevEyeSize - eyeSep, display.height() / 2, prevEyeSize, prevEyeRotation, BLACK);
      DrawEye(display.width() / 2 - eyeSize - eyeSep, display.height() / 2, eyeSize, eyeRotation, WHITE);
  
      //-- Right Eye --
      DrawEye(display.width() / 2 + prevEyeSize + eyeSep, display.height() / 2, prevEyeSize, prevEyeRotation, BLACK);
      DrawEye(display.width() / 2 + eyeSize + eyeSep, display.height() / 2, eyeSize, eyeRotation, WHITE);
  
      //-- Mouth --
      DrawMouth(prevMouthWidth, BLACK);
      DrawMouth(mouthWidth, WHITE);
  
      display.display();
  
      prevEyeSize = eyeSize;
      prevEyeRotation = eyeRotation;
      prevMouthWidth = mouthWidth;
    }
  }
  
  void DrawEye(int x0, int y0, int r, int rotation, int color)
  {
    //    display.drawCircle(display.width() / 2 - r, display.height() / 2, r, WHITE);
    //    display.drawCircle(display.width() / 2 + r, display.height() / 2, r, WHITE);
  
    int x[3], y[3];
    for (int i = 0; i < 3; i++)
    {
      float angle = (rotation * 2 * PI / 360) + i * 2 * PI / 3;
      x[i] = x0 + sin(angle) * r;
      y[i] = y0 + cos(angle) * r;
  ...

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