Through the microcontroller and 74HC164D, 40 pins are cycled to low level to light up the digital tube.
If one or two digital tubes are missing, try moving one pin first, and everything I tested was OK for the time being.
Because the driving current is small, it is impossible to light up a word at a high level alone, so both the common yin and the yang light up at a low level. The difference is that the common yin lights up 8 segments at a time, and the common yang lights up 1 segment at a time.
When downloading the microcontroller, select the 30MHz internal RC. No other configuration.
The source code is attached. There is no standardized format, so there is nothing you can do if you can’t understand it.
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