principle:
Due to the residual vision characteristics of the human eye: when the human eye observes the scene, it takes a short period of time for the light signal to be transmitted to the brain nerves. After the effect of the light ends, the visual image does not disappear immediately. This residual vision is called "afterimage", and this visual phenomenon is called "persistence of vision".
Example:
The lights we use at home are 50Hz, turning on and off 50 times in one second, but we feel that the lights are always on.
However, the degree of brightness and darkness depends on the ratio of the time of light and no light, but the duration of light and dark cannot exceed 1/24 second (the longest visual residual time)
programming:
#include typedef unsigned int u16; typedef unsigned char u8; sbit LED=P2^0; //LED void delay(u16 i) { while(i--); } void main() { while(1) { u16 and; for(i=10;i<=2000;i=i+10) { LED=0; //Low level lights up delay(i); LED=1; //High point off delay(1000); } for(i=2000;i>=10;i=i-10) { LED=0; //Low level lights up delay(i); LED=1; //High point off delay(1000); } } }
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Professor at Beihang University, dedicated to promoting microcontrollers and embedded systems for over 20 years.
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