Arduino Uno unable to power anything more than LCD


recently I bought an HD44780 LCD powered it up, but when set other devices like diodes, piezo buzzer or anything else it seems not to have enough power to run it. I have seen lots of projects using multiple devices on Arduino Uno and everyting is connected correctly (everything starts to work when I unplug LCD and delete lines in code associated with it), so what may be the problem? :slight_smile:

Is it working if you disconnect the backlight? They can pull 100ma in addition to the 100-150 needed for the LCD itself.

I tried disconnecting backlight, but it did not change anything. I power the Arduino with USB cable, if it matters.