Introduction - If you have any usage issues, please Google them yourself
(Static digital tube display)
<1> initial moment eight LEDs are off, eight digital tube all off, the buzzer does not sound.
<2> Define four separate buttons, when the first button is pressed, the buzzer sounds when the button is released, eight digital tube will display "1." When the second button is pressed, the buzzer sounds when the button is released, eight digital tube will display "2." When the third button is pressed, the buzzer sounds when the button is released, eight digital tube will display "3." When the fourth button is pressed, the buzzer sounds when the button is released, eight digital tube will display "4."