The lighted button's color-coded leads are NEGATIVE. So, despite the black lead's misleading color, it needs to be connected to 5V (3V3 will also work but the LED ring will be dimmer). Turning one of ...

The board used in this competition consists of a Arduino Seeeduino XIAO Microcontroller connected to eight push buttons and eight LEDs over a shift register (SN74HCS596). One of the push buttons is ...