#include <SPI.h>
#include <Wire.h>
#include <Adafruit_GFX.h>
#include <Adafruit_SSD1306.h>
#define SCREEN_WIDTH 128 // OLED display width, in pixels
#define SCREEN_HEIGHT 64 // OLED display height, in pixels

#define OLED_RESET     -1 // Reset pin # (or -1 if sharing Arduino reset pin)
#define SCREEN_ADDRESS 0x3c ///< See datasheet for Address; 0x3D for 128x64, 0x3C for 128x32
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

void setup() {
  Serial.begin(9600);
  // put your setup code here, to run once:
  // SSD1306_SWITCHCAPVCC = generate display voltage from 3.3V internally
  if (!display.begin(SSD1306_SWITCHCAPVCC, SCREEN_ADDRESS)) {
    Serial.println(F("SSD1306 allocation failed"));
    for (;;); // Don't proceed, loop forever
  }
  display.clearDisplay();

  display.drawRect(10, 10, 100, 40, SSD1306_WHITE);
  display.drawRect(110, 25, 10, 10, SSD1306_WHITE);
  display.display();
}

void loop() {
  //lets change it using potentiometer
  int data = analogRead(35);
  float value = float(data) / 4095.00 * 100.00;
  Serial.print(data);
  Serial.print(",");
  Serial.println(value);

  if (value < 10) {
    display.fillRect(15, 13, 25, 34, SSD1306_BLACK);
    display.fillRect(45, 13, 25, 34, SSD1306_BLACK);
    display.fillRect(75, 13, 25, 34, SSD1306_BLACK);
    display.fillRect(105, 13, 4, 34, SSD1306_BLACK);
    display.fillRect(111, 26, 8, 8, SSD1306_BLACK);
  }
  else if (value >= 10 && value <= 25) {
    display.fillRect(15, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(45, 13, 25, 34, SSD1306_BLACK);
    display.fillRect(75, 13, 25, 34, SSD1306_BLACK);
    display.fillRect(105, 13, 4, 34, SSD1306_BLACK);
    display.fillRect(111, 26, 8, 8, SSD1306_BLACK);
  }
  else if (value > 26 && value <= 50) {
    display.fillRect(15, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(45, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(75, 13, 25, 34, SSD1306_BLACK);
    display.fillRect(105, 13, 4, 34, SSD1306_BLACK);
    display.fillRect(111, 26, 8, 8, SSD1306_BLACK);
  }
  else if (value > 50 && value <= 75) {
    display.fillRect(15, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(45, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(75, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(105, 13, 4, 34, SSD1306_BLACK);
    display.fillRect(111, 26, 8, 8, SSD1306_BLACK);
  }
  else if (value > 75) {
    display.fillRect(15, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(45, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(75, 13, 25, 34, SSD1306_WHITE);
    display.fillRect(105, 13, 4, 34, SSD1306_WHITE);
    display.fillRect(111, 26, 8, 8, SSD1306_WHITE);
  }

  display.display();
  delay(10); // this speeds up the simulation
}