#include <TinyLiquidCrystal_I2C.h>

TinyLiquidCrystal_I2C lcd(0x27,20,4); 

#define BUTTON_PIN PB3
#define BUTTON_PIN PB1

int numberfreq;
int count;
float freq = 87.00;

void setup()
{
  lcd.init();                      
  // Print a message to the LCD.
  lcd.backlight();

pinMode(PB3, INPUT_PULLUP);
pinMode(PB1, INPUT_PULLUP);


  lcd.setCursor(0,0);
  lcd.print("FM");
  lcd.setCursor(3,0);
  lcd.print(freq);
  lcd.print(" MHz ");
   
}


void loop()
{
  if (digitalRead(PB3) == LOW) {
    numberfreq += 1;
    delay(200);

    if (numberfreq >= 84){
        numberfreq = 0;
      }

    freq = ((numberfreq * 25)+8700)*0.01;

    lcd.setCursor(3,0);
    lcd.print(freq);
    lcd.print(" MHz ");
  }

  if (digitalRead(PB1) == LOW) {
    numberfreq -= 1;
    delay(200);

    if (numberfreq <= 0){
        numberfreq = 84;
      }

    freq = ((numberfreq * 25)+8700)*0.01;

    lcd.setCursor(3,0);
    lcd.print(freq);
    lcd.print(" MHz ");
  }
}