Description: a) achieve clock function, can be in two seven-segment digital tube display seconds or minutes, with a switch control to switch between the two. b) to achieve clock function, time to play some music, and play a revolving door in the light-emitting diode design, the two-color LED on the scrolling dot matrix display their student number. Can control the speed of scrolling display and music playback, and alarm clock with a switch control switch.
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