我们先来看下最终的效果
我们先用单片机按照74hc595手动分解的例子,来实现我们想要的结果。
首先,我们让16个led灯交叉亮起来
代码部分:
int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5; void setup () { pinmode(stcp_pin,output); pinmode(shcp_pin,output); pinmode(ds_pin,output); } // 我们先让16个灯交叉亮 void loop() { while(1) { digitalwrite(stcp_pin, low); // 1 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, low); digitalwrite(shcp_pin, high); // 2 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, high); digitalwrite(shcp_pin, high); // 3 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, low); digitalwrite(shcp_pin, high); // 4 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, high); digitalwrite(shcp_pin, high); // 5 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, low); digitalwrite(shcp_pin, high); // 6 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, high); digitalwrite(shcp_pin, high); // 7 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, low); digitalwrite(shcp_pin, high); // 8 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, high); digitalwrite(shcp_pin, high); // 9 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, low); digitalwrite(shcp_pin, high); // 10 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, high); digitalwrite(shcp_pin, high); // 11 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, low); digitalwrite(shcp_pin, high); // 12 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, high); digitalwrite(shcp_pin, high); // 13 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, low); digitalwrite(shcp_pin, high); // 14 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, high); digitalwrite(shcp_pin, high); // 15 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, low); digitalwrite(shcp_pin, high); // 16 digitalwrite(shcp_pin, low); digitalwrite(ds_pin, high); digitalwrite(shcp_pin, high); digitalwrite(stcp_pin, high); } }
运行效果
然后我们再把代码简化一下,使其看起来更简洁,实用
int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5; void setup () { pinmode(stcp_pin,output); pinmode(shcp_pin,output); pinmode(ds_pin,output); digitalwrite(stcp_pin, low); } void loop() { unsigned char led_data; while(1) { led_data = 0xaa; // 第一个8位 digitalwrite(stcp_pin, low); for(int i=0; i<8; i++) { if(led_data&0x80){ digitalwrite(ds_pin, high);} else { digitalwrite(ds_pin, low); } digitalwrite(shcp_pin, low); digitalwrite(shcp_pin, high); led_data <<=1; } // 第二个8位 led_data = 0xaa; for(int i=0; i<8; i++) { if(led_data&0x80){ digitalwrite(ds_pin, high);} else { digitalwrite(ds_pin, low); } digitalwrite(shcp_pin, low); digitalwrite(shcp_pin, high); led_data <<=1; } digitalwrite(stcp_pin, high); delay(1000); } }
我们稍微改变下,让led灯按照我们的意思工作,封装一下函数,然后让中间四个灯亮起来
int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5; void hc595_write(unsigned char data1, unsigned char data2); void setup () { pinmode(stcp_pin,output); pinmode(shcp_pin,output); pinmode(ds_pin,output); } void loop() { unsigned char led_data1 = 0x03; unsigned char led_data2 = 0xc0; while(1) { hc595_write(led_data1, led_data2); delay(1000); } } void hc595_write(unsigned char data1, unsigned char data2) { // 第一个8位 digitalwrite(stcp_pin, low); for(int i=0; i<8; i++) { if(data1&0x80){ digitalwrite(ds_pin, high);} else { digitalwrite(ds_pin, low); } digitalwrite(shcp_pin, low); digitalwrite(shcp_pin, high); data1 <<=1; } // 第二个8位 for(int i=0; i<8; i++) { if(data2&0x80){ digitalwrite(ds_pin, high);} else { digitalwrite(ds_pin, low); } digitalwrite(shcp_pin, low); digitalwrite(shcp_pin, high); data2 <<=1; } digitalwrite(stcp_pin, high); }
中间四个led灯亮的效果
然后我们连贯起来搞个流水的灯玩玩
int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5; unsigned char led_data1[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80}; unsigned char led_data2[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80}; void hc595_write(unsigned char data1, unsigned char data2); void setup () { pinmode(stcp_pin,output); pinmode(shcp_pin,output); pinmode(ds_pin,output); } void loop() { while(1) { for(int i=0; i<8; i++) { hc595_write(0x00, led_data1[i]); delay(1000); } for(int i=0; i<8; i++) { hc595_write( led_data2[i], 0x00); delay(1000); } } } void hc595_write(unsigned char data1, unsigned char data2) { // 第一个8位 digitalwrite(stcp_pin, low); for(int i=0; i<8; i++) { if(data1&0x80){ digitalwrite(ds_pin, high);} else { digitalwrite(ds_pin, low); } digitalwrite(shcp_pin, low); digitalwrite(shcp_pin, high); data1 <<=1; } // 第二个8位 for(int i=0; i<8; i++) { if(data2&0x80){ digitalwrite(ds_pin, high);} else { digitalwrite(ds_pin, low); } digitalwrite(shcp_pin, low); digitalwrite(shcp_pin, high); data2 <<=1; } digitalwrite(stcp_pin, high); }
最终的流水灯实验效果
当然arduino本身自带了移位函数,同样可以达到效果
int stcp_pin = 4; int shcp_pin = 6; int ds_pin = 5; unsigned char led_data1[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80}; unsigned char led_data2[8] = { 0x01, 0x02, 0x04, 0x08, 0x10, 0x20, 0x40, 0x80}; void setup () { pinmode(stcp_pin,output); pinmode(shcp_pin,output); pinmode(ds_pin,output); } void loop() { for(int a=0; a<8; a++) { digitalwrite(stcp_pin,low); shiftout(ds_pin,shcp_pin,msbfirst,led_data1[a]); shiftout(ds_pin,shcp_pin,msbfirst,0x00); digitalwrite(stcp_pin,high); delay(500); } for(int a=0; a<8; a++) { digitalwrite(stcp_pin,low); shiftout(ds_pin,shcp_pin,msbfirst,0x00); shiftout(ds_pin,shcp_pin,msbfirst,led_data2[a]); digitalwrite(stcp_pin,high); delay(500); } }
流水的延时500ms的效果
总结:
1、复杂的功能,深入分解后背后的原理其实还是挺简单的;
2、我们绝大部分时候都在造“轮子“,殊不知更优秀的“轮子”已经造好了;知晓“轮子”的由来,然后造出更优秀的“轮子”给自己用也是单片机学习路上的一项重要技能。
需要了解更多c/c++开发分享单片机三个引脚控制16路流水灯,都可以关注C/C++技术分享栏目—计算机技术网(www.ctvol.com)!
本文来自网络收集,不代表计算机技术网立场,如涉及侵权请联系管理员删除。
ctvol管理联系方式QQ:251552304
本文章地址:https://www.ctvol.com/c-cdevelopment/645162.html