// Author     : [email protected]
// Description: Displays potentiometer value via arduino to oled 128x32

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

// 0.96 inch
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

// 0.91 inch
// #define SCREEN_HEIGHT 32 // OLED display height, in pixels

#define POTENTIOMETER_PIN 7

int sensorValue = 0;
// Declaration for an SSD1306 display connected to I2C (SDA, SCL pins)
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, -1);

void setup() {
  Serial.begin(115200);

  if(!display.begin(SSD1306_SWITCHCAPVCC, 0x3C)) { // Address 0x3D for 128x64
    Serial.println(F("SSD1306 allocation failed"));
    for(;;);
  }

  display.clearDisplay();
  display.setTextSize(1);
  display.setTextColor(WHITE);
  display.setCursor(0,0);
  display.setTextSize(1);
  display.println("Hello!");
  display.display();
  delay(1500);
}

void loop() {
  int sensorValue = analogRead(POTENTIOMETER_PIN);

  display.clearDisplay();
  display.setCursor(0,0);
  display.println("POT: " + String(sensorValue));

  unsigned long mappedValue = map(sensorValue, 0, 1023, 0, 65535);
  display.setCursor(0,8);
  display.println("MAP: " + String(mappedValue));
  display.display();

  int brightness = map(sensorValue, 0, 1023, 0, 255);
  display.setCursor(0,16);
  display.println("BRI: " + String(brightness));
  display.display();

  analogWrite(LED_BUILTIN, brightness);

  delay(1000);
}