#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 16, 2);
#define b1 12//up
#define b2 13//down
int counter = 0;
void setup() {
  Serial.begin(115200);
  pinMode(b1, INPUT_PULLUP);
  pinMode(b2, INPUT_PULLUP);
  lcd.init();
  lcd.backlight();
  lcd.clear();
  delay(1000);
}
void loop() {
  int up = !digitalRead(b1);
  int down = !digitalRead(b2);
  switch (up) {
    case 1:
      counter++;
      break;
  }
  switch (down) {
    case 1:
      counter--;
      break;
  }
  lcd.setCursor(4, 0);
  lcd.print("Counter:");
  lcd.setCursor(6, 1);
  lcd.print(counter);
  delay(200);
}