You can use the buttons to input the age. The default is 70 years old as the upper limit. The difference between the input age and 70 years old is calculated and converted into seconds. The buttons are input/display switching, +10, and +1. 51 is used as the main control, the 4-16 line decoder controls the refresh display, and xpt2046 reads the resistance value to adjust the speed. Part-time study, small things made for classmates, the xpt2046 driver code uses the code of Puzhong Technology. Totally unprofessional.
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