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[i]);
- //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[i]
- 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[i]);
- //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[i]
- digitalWrite(latchPin,HIGH);
- //将ST_CP这个针脚恢复到高电平
- delay(1000); //延时500ms
- }
- }
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