joystick-oled.ino

#include <Wire.h>                  // This library allows you to communicate with I2C
#include <Adafruit_GFX.h>          // Adafruit GFX graphics core library
#include <Adafruit_SSD1306.h>      // Driver library for 'monochrome' 128x64 and 128x32 OLEDs

#define OLED_RESET 4

Adafruit_SSD1306 display(OLED_RESET);
    
#if (SSD1306_LCDHEIGHT != 64)
  #error("Height incorrect, please fix Adafruit_SSD1306.h!");
#endif

int analogPinX = 0; // A0
int analogPinY = 1; // A1
int buttonPin = 7;
int torlerance = 10;
int wait = 10;

int centerX = 530;
int centerY = 530;

int previousX = 0;
int previousY = 0;
int x, y, button;
int changed = false;

int displayHeight = 0;
int displayWidth = 0;
int displayX = 0;
int displayY = 0;

void setup() {
  // put your setup code here, to run once:
  pinMode(analogPinX, INPUT);  
  pinMode(analogPinY, INPUT);
  pinMode(buttonPin, INPUT);

  Serial.begin(9600);

  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);  // initialize with the I2C addr 0x3C (for the 128x64)
  display.clearDisplay();
  display.display();

  displayHeight = display.height() - 1;
  displayWidth = display.width() - 1;
}

void loop() {
  // put your main code here, to run repeatedly:
  x = analogRead(analogPinX);
  y = analogRead(analogPinY);
  button = digitalRead(buttonPin);

  if (abs(0 - x) <= torlerance || abs(0 - y) <= torlerance ||
    abs(1023 - x) <= torlerance || abs(1023 - y) <= torlerance ||
    abs(previousX - x) >= torlerance || abs(previousY - y) >= torlerance) { 
//    Serial.print("X=");
//    Serial.print(x);
//    Serial.print(", Y=");
//    Serial.print(y);

    if (x - previousX > 0 || x == 1023) {
      displayX += 1;
    }

    if (x - previousX < 0 || x == 0) {
      displayX -= 1;
    }

    if (y - previousY > 0 || y == 1023) {
      displayY += 1;
    }

    if (y - previousY < 0 || y == 0) {
      displayY -= 1;
    }

    if (displayX <= 0) {
      displayX = 0;
    }

    if (displayX >= displayWidth) {
      displayX = displayWidth;
    }

    if (displayY <= 0) {
      displayY = 0;
    }

    if (displayY >= displayHeight) {
      displayY = displayHeight;
    }    

    //display.drawPixel(displayX, displayY, WHITE);
    //display.fillRect(displayX, displayY, 4, 4, WHITE);
    display.drawCircle(displayX, displayY, 10, WHITE);
    
    //display.drawPixel(map(x, 0, 1023, 0, displayWidth), map(y, 0, 1023, 0, displayHeight), WHITE);
    display.display();
    display.clearDisplay();

    previousX = x;
    previousY = y;
  }
  
  delay(wait);
}