74HC595控制四位数码管(共阴)
本帖最后由 弘毅 于 2018-11-13 19:53 编辑硬件:
Arduino UNO
74HC595 X 1
四位数码管(共阴) X1
220欧电阻 x4
目的:用74HC595 驱动四位数码管(共阴)显示0-9及a-F
代码:
int clockPin = 5;//时钟引脚设置
int dataPin = 2;//数据引脚设置
int latchPin = 4;//锁存引脚设置
unsigned char table[] ={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};//共阴数码管代码表"0-F"
//unsigned char table[] ={0xc0,0xf9,0xa4,0xb0,0x99,0x92,0x82,0xf8,0x80,0x90,0x88,0x83,0xc6,0xa1,0x86,0x8e}; //共阳数码管代码表"0-F"
void setup ()
{
pinMode(latchPin,OUTPUT);
pinMode(clockPin,OUTPUT);
pinMode(dataPin,OUTPUT);
//让三个脚都是输出状态
}
void loop()
{
for(int i=0; i<15; i++)
{
digitalWrite(latchPin,LOW);
//将ST_CP口上面加低电平让芯片准备好接收数据
shiftOut(dataPin,clockPin,MSBFIRST,table);
//串行数据输入引脚为dataPin，时钟引脚为clockPin，执行MSB有限发送，发送数据table
digitalWrite(latchPin,HIGH);
//将ST_CP这个针脚恢复到高电平
delay(1000); //延时500ms
}
for(int i=15; i>=0; i--)
{
digitalWrite(latchPin,LOW);
//将ST_CP口上面加低电平让芯片准备好接收数据
shiftOut(dataPin,clockPin,MSBFIRST,table);
//串行数据输入引脚为dataPin，时钟引脚为clockPin，执行MSB有限发送，发送数据table
digitalWrite(latchPin,HIGH);
//将ST_CP这个针脚恢复到高电平
delay(1000); //延时500ms
}
}
https://pan.baidu.com/s/1VThT1KnlkZ3p0-fOoGfA4Q
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