Program for microcontroller to detect the status of switch pressing-EEWORLD

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The following program is to enable us to display the corresponding status through an LED light when we press the switch button. The function of this program is: we can control the output of multiple circuits through the single-chip microcomputer and buttons. Of course, if we change the LED light to a circuit that realizes other functions, we can achieve the purpose of controlling multiple circuits. For example, in the application of the buzzer, when our contestants press it, the digital tube can display the contestant's number. Of course, the buzzer is more complicated than this. There is a production of this on the www.51hei.com single-chip learning website, but this program is the basis of the buzzer. I think it is very practical, so I share it with you.

The specific circuit is as follows:

The procedure is as follows:

#include
sbit p20=P2^0;
sbit p21=P2^1;
sbit p22=P2^2;
sbit p23=P2^3;
sbit p24=P2^4;
sbit p25=P2^5;
sbit p26=P2^6;
sbit p27=P2^7;
void main()
{
while(1)
{
if(p24==0)
  p23=0;
else
p23=1;
if(p25==0)
  p22=0;
else
p22=1;
if(p26==0)
  p21=0;
else
p21=1;

if(p27==0)
p20=0;
else
p20=1;
}
}

Keywords：MCU Reference address：Program for microcontroller to detect the status of switch pressing

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