Hollow-Clock-Plus second hand, minute hand, hour hand, one can not be less!

Some time ago, when I visited station b, I saw this floating clock, which is quite NICE. After careful observation, the floating clock has no second hand! Therefore, on the basis of the original structure, we made hundreds of millions of modifications and added the second hand structure.

I also improved the control board, using the cheaper LGT8F328P instead of the Arduino nano, and using the SMD ULN2003 chip to further reduce the size of the motor driver board.

I also added some other modifications, pasted fluorescent tape and light strips, and added a sound and light control module. With just a snap of your fingers, you can summon the dragon to light the way forward!

Problems to be optimized:

(1) Noise: The stepper motor needs to run all the time, causing large noise and heat.

(2) Timing accuracy: The timing accuracy of single-chip microcomputer is inaccurate, and it is open-loop control. Currently, some UPs use ESP to obtain network time to solve this problem.

Link: https://pan.baidu.com/s/1Vv4VlQE_5rLjT91jhN5-FA
Extraction code: 1992 video demonstration connection