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

#define SCREEN_WIDTH 128
#define SCREEN_HEIGHT 64
#define OLED_RESET -1
Adafruit_SSD1306 display(SCREEN_WIDTH, SCREEN_HEIGHT, &Wire, OLED_RESET);

#define FORWARD_PIN 19
#define BACKWARD_PIN 18
#define DEBOUNCE_DELAY 50 // Adjust debounce delay as needed

volatile int counter = 0;
volatile bool forwardButtonPressed = false;
volatile bool backwardButtonPressed = false;

void incrementCounter() {
  if (!forwardButtonPressed) {
      forwardButtonPressed = true;
          counter++;
            }
            }

            void decrementCounter() {
              if (!backwardButtonPressed) {
                  backwardButtonPressed = true;
                      counter--;
                          if (counter < 0) {
                                counter = 0;
                                    }
                                      }
                                      }

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

                                          pinMode(FORWARD_PIN, INPUT_PULLUP);
                                            attachInterrupt(digitalPinToInterrupt(FORWARD_PIN), incrementCounter, FALLING);

                                              pinMode(BACKWARD_PIN, INPUT_PULLUP);
                                                attachInterrupt(digitalPinToInterrupt(BACKWARD_PIN), decrementCounter, FALLING);

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

                                                              display.display();
                                                                delay(2000);
                                                                  display.clearDisplay();
                                                                  }

                                                                  void loop() {
                                                                    display.clearDisplay();
                                                                      display.setTextSize(9);
                                                                        display.setTextColor(SSD1306_WHITE);
                                                                          display.setCursor(0, 0);
                                                                          
                                                                              display.println(counter);
                                                                                display.display();
                                                                                  delay(100);

                                                                                    // Debouncing for forward button
                                                                                      if (!digitalRead(FORWARD_PIN)) {
                                                                                          delay(DEBOUNCE_DELAY);
                                                                                              if (!digitalRead(FORWARD_PIN)) {
                                                                                                    incrementCounter();
                                                                                                        }
                                                                                                          } else {
                                                                                                              forwardButtonPressed = false;
                                                                                                                }

                                                                                                                  // Debouncing for backward button
                                                                                                                    if (!digitalRead(BACKWARD_PIN)) {
                                                                                                                        delay(DEBOUNCE_DELAY);
                                                                                                                            if (!digitalRead(BACKWARD_PIN)) {
                                                                                                                                  decrementCounter();
                                                                                                                                      }
                                                                                                                                        } else {
                                                                                                                                            backwardButtonPressed = false;
                                                                                                                                              }
                                                                                                                                              }