Hi,
lcd.clear();
May eventually cause your display to flicker as you get it to display more characters.
switch (lcd_key)
{
case btnUP:
{
tempval++;
lcd.setCursor(0, 1);
lcd.print(" ");
lcd.setCursor(0, 1);
lcd.print(tempval);
delay(250);
break;
}
case btnDOWN:
{
tempval--;
lcd.setCursor(0, 1);
lcd.print(" ");
lcd.setCursor(0, 1);
lcd.print(tempval);
delay(250);
break;
}
}
Will be better as it overwrites the old digits with spaces before you write the new data, and leaves the rest of the display alone.
Tom... 