48 lines
1.2 KiB
C
48 lines
1.2 KiB
C
/*
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* raspberrypi key light
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* 功能：key等于1时，亮的灯灭、灭的灯亮
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*/
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#include <wiringPi.h>
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#include <stdio.h>
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#include <stdlib.h>
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#include <string.h>
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#include <unistd.h>
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#define LIGHT 3 // 灯PIN引脚
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#define KEY 4 // 按键PIN引脚
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int main(int argc, char **argv) {
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daemon(1, 1);
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if(-1 == wiringPiSetup())
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{
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printf("wiringPi setup error\n");
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exit(-1);
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}
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pinMode(KEY, INPUT); // 按键输入模式
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pullUpDnControl(KEY, PUD_DOWN); // 按键启用下拉电阻，引脚电平拉到GND
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pinMode(LIGHT, OUTPUT); // 灯PIN引脚输出模式
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int light_status;
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int key_status;
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while(1){
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light_status = digitalRead(LIGHT); // 灯状态
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key_status = digitalRead(KEY); // 按键状态
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if (key_status == 1) {
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if (light_status == 0) {
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digitalWrite(LIGHT, HIGH); // 开灯
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}
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if (light_status == 1) {
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digitalWrite(LIGHT, LOW); // 关灯
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}
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}
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printf("%d\n", digitalRead(KEY));
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delay(200);
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}
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} |