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

#define OLED_RESET -1 // Reset pin # (or -1 if sharing Arduino reset pin)
Adafruit_SSD1306 display(OLED_RESET);

void setup() {
  // Initialize SSD1306 display with the I2C address 0x3C
  display.begin(SSD1306_SWITCHCAPVCC, 0x3C);

  // Clear the display buffer.
  display.clearDisplay();

  // Display "STARTING" message
  display.setTextSize(2); // Increase text size
  display.setTextColor(SSD1306_WHITE);
  display.setCursor(10, 10); // Move cursor
  display.println("STARTING");
  display.display(); // Display the message

  delay(2000); // Pause for 2 seconds

  display.clearDisplay(); // Clear the display buffer
}

void loop() {  
  static int previousS = -1;
  int S = analogRead(A0);

  // Check if the current analog reading is significantly different from the previous reading
  if (abs(S - previousS) > 5) { // Decrease threshold for faster updates
    // Clear the display buffer.
    display.clearDisplay();
    
    // Display analog reading
    display.setTextSize(1);
    display.setTextColor(SSD1306_WHITE);
    display.setCursor(0, 0);
    display.print("Analog reading: ");
    display.println(S);
    
    // Display bar graph decoration with thicker line
    display.drawFastHLine(0, 20, S / 10, SSD1306_WHITE);
    display.drawFastHLine(0, 21, S / 10, SSD1306_WHITE);
    display.drawFastHLine(0, 22, S / 10, SSD1306_WHITE);
    display.drawFastHLine(0, 23, S / 10, SSD1306_WHITE);

    display.display(); // Update the display
    previousS = S;
  }

  // Update LEDs based on the analog reading
  for (int i = 0; i < 10; i++) {
    if (S >= 102.3 * (i + 1)) {
      digitalWrite(i, HIGH); // Turn on LED
    } else {
      digitalWrite(i, LOW); // Turn off LED
    }
  }
}
// MADE BY ME WITH HELP FROM CHATGTP