原理图:
接线图:
实体接线图:
代码:
#include <wiringPi.h>
#include <stdio.h>
#define BtnPin 0
#define Gpin 1
#define Rpin 2
void LED(char* color)
{
pinMode(Gpin, OUTPUT);
pinMode(Rpin, OUTPUT);
if (color == "RED")
{
digitalWrite(Rpin, HIGH);
digitalWrite(Gpin, LOW);
}
else if (color == "GREEN")
{
digitalWrite(Rpin, LOW);
digitalWrite(Gpin, HIGH);
}
else
printf("LED Error");
}
int main(void)
{
if(wiringPiSetup() == -1){ //when initialize wiring failed,print messageto screen
printf("setup wiringPi failed !");
return 1;
}
pinMode(BtnPin, INPUT);
LED("GREEN");
while(1){
if(0 == digitalRead(BtnPin)){
delay(10);
if(0 == digitalRead(BtnPin)){
LED("RED");
printf("Button is pressed\n");
}
}
else if(1 == digitalRead(BtnPin)){
delay(10);
if(1 == digitalRead(BtnPin)){
while(!digitalRead(BtnPin));
LED("GREEN");
}
}
}
return 0;
}
编译运行:
gcc button.c -o button -lwiringPi -lpthread
./button