（8）趣味单片机新玩法-多个数码管扫描显示
2021-03-20 本文已影响0人
想啥做啥
我们先来看第一个效果，数码管以秒计数显示
动态效果图
老套路，我们接下来进行分解，我们首先第一步就是让每个数码管都可控，不知道怎么使用74HC595的可以参考之前写的文章
代码：
/* Main.ino file generated by New Project wizard
*
* Created: 周六 3月 20 2021
* Processor: Arduino Uno
* Compiler: Arduino AVR (Proteus)
*/
// Peripheral Configuration Code (do not edit)
//---CONFIG_BEGIN---
#pragma GCC push_options
#pragma GCC optimize ("Os")
#include <core.h> // Required by cpu
#include <cpu.h>
#pragma GCC pop_options
// Peripheral Constructors
CPU &cpu = Cpu;
void peripheral_setup () {
}
void peripheral_loop() {
}
//---CONFIG_END---
int STCP_Pin = 6;
int SHCP_Pin = 4;
int DS_Pin = 5;
char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void setup () {
peripheral_setup();
// TODO: put your setup code here, to run once:
pinMode(STCP_Pin,OUTPUT);
pinMode(SHCP_Pin,OUTPUT);
pinMode(DS_Pin,OUTPUT);
}
void loop() {
peripheral_loop();
// TODO: put your main code here, to run repeatedly:
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xDF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[0]);
digitalWrite(STCP_Pin,HIGH);
delay(500);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xEF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[1]);
digitalWrite(STCP_Pin,HIGH);
delay(500);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xF7);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[2]);
digitalWrite(STCP_Pin,HIGH);
delay(500);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFB);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[3]);
digitalWrite(STCP_Pin,HIGH);
delay(500);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFD);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[4]);
digitalWrite(STCP_Pin,HIGH);
delay(500);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFE);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[5]);
digitalWrite(STCP_Pin,HIGH);
delay(500);
}
我们接下来把速度提一提，延时改成50ms
感觉还是有点慢，我们再提点速度，改成10ms
但是，感觉显示有点乱，我们尝试在每个数码管显示过后给它关闭，在电视机邻域有个专业的名词叫消隐
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xDF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[0]);
digitalWrite(STCP_Pin,HIGH);
delay(10);
// 消隐
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
digitalWrite(STCP_Pin,HIGH);
delay(1);
我们再来看下效果，是不是没有乱码了，之前因为没有关闭，由于人眼的余晖效应，会造成乱码
然后我们稍微再提点速度≥50Hz的刷新率，6个数码管，每个耗时3ms，这样整个下来的总时间是18ms，基本上就不会看到闪烁。
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xDF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[0]);
digitalWrite(STCP_Pin,HIGH);
delay(2);
// 消隐
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
digitalWrite(STCP_Pin,HIGH);
delay(1);
18ms刷新的效果，基本看不到闪烁的变化
文章开头效果总代码：
/* Main.ino file generated by New Project wizard
*
* Created: 周六 3月 20 2021
* Processor: Arduino Uno
* Compiler: Arduino AVR (Proteus)
*/
// Peripheral Configuration Code (do not edit)
//---CONFIG_BEGIN---
#pragma GCC push_options
#pragma GCC optimize ("Os")
#include <core.h> // Required by cpu
#include <cpu.h>
#pragma GCC pop_options
// Peripheral Constructors
CPU &cpu = Cpu;
void peripheral_setup () {
}
void peripheral_loop() {
}
//---CONFIG_END---
int STCP_Pin = 6;
int SHCP_Pin = 4;
int DS_Pin = 5;
char table[]={0x3f,0x06,0x5b,0x4f,0x66,0x6d,0x7d,0x07,0x7f,0x6f,0x77,0x7c,0x39,0x5e,0x79,0x71};
void setup () {
peripheral_setup();
// TODO: put your setup code here, to run once:
pinMode(STCP_Pin,OUTPUT);
pinMode(SHCP_Pin,OUTPUT);
pinMode(DS_Pin,OUTPUT);
}
int count = 0;
int sec = 0;
void loop() {
peripheral_loop();
count++;
if(count>50)
{
count=0;
sec++;
if(sec>10)sec=0;
}
// TODO: put your main code here, to run repeatedly:
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xDF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
digitalWrite(STCP_Pin,HIGH);
delay(2);
// 消隐
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
digitalWrite(STCP_Pin,HIGH);
delay(1);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xEF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
digitalWrite(STCP_Pin,HIGH);
delay(2);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
digitalWrite(STCP_Pin,HIGH);
delay(1);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xF7);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
digitalWrite(STCP_Pin,HIGH);
delay(2);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
digitalWrite(STCP_Pin,HIGH);
delay(1);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFB);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
digitalWrite(STCP_Pin,HIGH);
delay(2);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
digitalWrite(STCP_Pin,HIGH);
delay(1);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFD);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
digitalWrite(STCP_Pin,HIGH);
delay(2);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
digitalWrite(STCP_Pin,HIGH);
delay(1);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFE);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, table[sec]);
digitalWrite(STCP_Pin,HIGH);
delay(2);
digitalWrite(STCP_Pin,LOW);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0xFF);
shiftOut(DS_Pin,SHCP_Pin,MSBFIRST, 0x00);
digitalWrite(STCP_Pin,HIGH);
delay(1);
}
总结
复杂的原理来自多年实验的总结，同样也来自生活实践。
