拓展Arduino控制引脚---74HC59

视频来源:https://www.youtube.com/watch?v=OiKgWRRWj4c&list=PLdckmk1Jf8MYOED98iY13wdGi52h-O69X&index=12
bilibili:https://www.bilibili.com/video/BV1YW411Z76E?t=33&p=11

原理介绍

74HC59芯片电路原理图如下：

除去VCC，GND两个引脚外，共有8个输出引脚，在使用时，OE引脚接地，MR引脚置高位，DS，ST_CP，SH_CP为信号输入引脚
为了更好的去理解这个原件的工作逻辑，可将DS，ST_CP，SH_CP三个引脚分别比作“资料块”，“大平台”，“活塞”

其工作原理其实也很简单，当ST_CP也就是我们的大平台置低电位时，可以写入数据，通过给DS赋值，并使用SH_CP将其写入序列，之后再将ST_CP置高位，就可以的到自己想要的数据输出了。

代码演示V1.0

跟着原理来敲一遍代码：

/*74HC59实例*/
int big = 2;
int push = 3;
int datain = 4;

void setup() {
    
    
  pinMode(big,OUTPUT);			
  pinMode(push,OUTPUT);
  pinMode(datain,OUTPUT);
  
}

void loop() {
    
    
  digitalWrite(big,LOW);
  //No.1
  digitalWrite(push,LOW);
  digitalWrite(datain,1);
  digitalWrite(push,HIGH);
  //No.2
  digitalWrite(push,LOW);
  digitalWrite(datain,0);
  digitalWrite(push,HIGH);
  //No.3
  digitalWrite(push,LOW);
  digitalWrite(datain,1);
  digitalWrite(push,HIGH);
  //No.4
  digitalWrite(push,LOW);
  digitalWrite(datain,0);
  digitalWrite(push,HIGH);
  //No.5
  digitalWrite(push,LOW);
  digitalWrite(datain,1);
  digitalWrite(push,HIGH);
  //No.6
  digitalWrite(push,LOW);
  digitalWrite(datain,0);
  digitalWrite(push,HIGH);
  //No.7
  digitalWrite(push,LOW);
  digitalWrite(datain,1);
  digitalWrite(push,HIGH);
  //No.8
  digitalWrite(push,LOW);
  digitalWrite(datain,0);
  digitalWrite(push,HIGH);

  digitalWrite(big,HIGH);
  
}

代码优化V2.0

使用函数对代码进行优化

/*74HC59实例*/
int big = 2;
int push = 3;
int datain = 4;

void setup() {
    
    
  pinMode(big,OUTPUT);
  pinMode(push,OUTPUT);
  pinMode(datain,OUTPUT);
  
}

void loop() {
    
    
  digitalWrite(big,LOW);
  //No.1
  putOne();
  //No.2
  putZero();
  //No.3
  putOne();
  //No.4
  putZero();
  //No.5
  putOne();
  //No.6
  putZero();
  //No.7
  putOne();
  //No.8
  putZero();

  digitalWrite(big,HIGH);
  
}

void putOne(){
    
    
  digitalWrite(push,LOW);
  digitalWrite(datain,1);
  digitalWrite(push,HIGH);
}
void putZero(){
    
    
  digitalWrite(push,LOW);
  digitalWrite(datain,0);
  digitalWrite(push,HIGH);
}

代码优化V3.0

int big = 2;
int push = 3;
int datain = 4;

void setup() {
    
    
  pinMode(big,OUTPUT);
  pinMode(push,OUTPUT);
  pinMode(datain,OUTPUT);
  
}

void loop() {
    
    
  digitalWrite(big,LOW);
  //No.1
  putnumber(1);
  //No.2
  putnumber(0);
  //No.3
  putnumber(1);
  //No.4
  putnumber(0);
  //No.5
  putnumber(1);
  //No.6
  putnumber(0);
  //No.7
  putnumber(1);
  //No.8
  putnumber(0);

  digitalWrite(big,HIGH);
  
}

void putnumber(int number){
    
    
  digitalWrite(push,LOW);
  digitalWrite(datain,number);
  digitalWrite(push,HIGH);
}

代码优化v4.0

使用数组+for循环+自建函数

int big = 2;
int push = 3;
int datain = 4;
int datainput[8] = {
    
    1,0,1,0,1,0,1,0};

void setup() {
    
    
  pinMode(big,OUTPUT);
  pinMode(push,OUTPUT);
  pinMode(datain,OUTPUT);
  
}

void loop() {
    
    
  digitalWrite(big,LOW);
  for(int i=0;i<8;i++){
    
    
  putmunber(datainput[i]);
  }
}

void putnumber(int number){
    
    
  digitalWrite(push,LOW);
  digitalWrite(datain,number);
  digitalWrite(push,HIGH);
}