11.累加器实验

来源：互联网发布：天涯明月刀iu捏脸数据编辑：程序博客网时间：2024/05/16 16:04

实验现象：每当按下一个按键，数码管显示值加一。

理论学习：熟悉四位数码管显示原理，回顾以前实验中按键的写法。编写出需要的实验效果。

程序代码：

#include <Arduino.h>#define SEG_A 2#define SEG_B 3#define SEG_C 4#define SEG_D 5#define SEG_E 6#define SEG_F 7#define SEG_G 8#define SEG_H 9#define COM1 10#define COM2 11#define COM3 12#define COM4 13#define KEY 0int SUM = 0;int Flag_up = 1;unsigned char table[10][8] ={{0,0,1,1,1,1,1,1},//0{0,0,0,0,0,1,1,0},//1{0,1,0,1,1,0,1,1},//2{0,1,0,0,1,1,1,1},//3{0,1,1,0,0,1,1,0},//4{0,1,1,0,1,1,0,1},//5{0,1,1,1,1,1,0,1},//6{0,0,0,0,0,1,1,1},//7{0,1,1,1,1,1,1,1},//8{0,1,1,0,1,1,1,1}//9};void setup(){pinMode(SEG_A,OUTPUT);//设置为输出引脚pinMode(SEG_B,OUTPUT);pinMode(SEG_C,OUTPUT);pinMode(SEG_D,OUTPUT);pinMode(SEG_E,OUTPUT);pinMode(SEG_F,OUTPUT);pinMode(SEG_G,OUTPUT);pinMode(SEG_H,OUTPUT);pinMode(COM1,OUTPUT);pinMode(COM2,OUTPUT);pinMode(COM3,OUTPUT);pinMode(COM4,OUTPUT);  pinMode(KEY,INPUT_PULLUP);//按键IO设定为带上拉输入}void loop(){  if( ScanKey() == 1)//当有按键按下时  {    SUM++;//SUM加一    if(SUM>9999)//最大值9999，不再累加    {      SUM = 9999;    }  }    Display(1,SUM/1000);//显示SUM千位值  delay(3);  Display(2,SUM%1000/100);//显示SUM百位值  delay(3);  Display(3,SUM%100/10);//显示SUM十位值  delay(3);  Display(4,SUM%10);//显示SUM个位值  delay(3);}unsigned char ScanKey()//按键扫描程序，返回键值{  if(Flag_up  && digitalRead(KEY) == LOW)//当Flag_up = 1并且按键按下时  {    Flag_up = 0;//清空Flag_up    delay(20);//延时去抖动    if(digitalRead(KEY) == LOW)//按键按下    {      return 1;//返回键值1    }  }  if(digitalRead(KEY) == HIGH)//按键松开时候  {    Flag_up = 1;//置位Flag_up  }  return 0;//返回键值0}void Display(unsigned char com,unsigned char num){digitalWrite(SEG_A,LOW);//去除余晖digitalWrite(SEG_B,LOW);digitalWrite(SEG_C,LOW);digitalWrite(SEG_D,LOW);digitalWrite(SEG_E,LOW);digitalWrite(SEG_F,LOW);digitalWrite(SEG_G,LOW);digitalWrite(SEG_H,LOW);switch(com)//选通位选{case 1:digitalWrite(COM1,LOW);//选择位1digitalWrite(COM2,HIGH);digitalWrite(COM3,HIGH);digitalWrite(COM4,HIGH);break;case 2:digitalWrite(COM1,HIGH);digitalWrite(COM2,LOW);//选择位2digitalWrite(COM3,HIGH);digitalWrite(COM4,HIGH);break;case 3:digitalWrite(COM1,HIGH);digitalWrite(COM2,HIGH);digitalWrite(COM3,LOW);//选择位3digitalWrite(COM4,HIGH);break;case 4:digitalWrite(COM1,HIGH);digitalWrite(COM2,HIGH);digitalWrite(COM3,HIGH);digitalWrite(COM4,LOW);//选择位4break;default:break;}digitalWrite(SEG_A,table[num][7]);//a查询码值表digitalWrite(SEG_B,table[num][6]);digitalWrite(SEG_C,table[num][5]);digitalWrite(SEG_D,table[num][4]);digitalWrite(SEG_E,table[num][3]);digitalWrite(SEG_F,table[num][2]);digitalWrite(SEG_G,table[num][1]);digitalWrite(SEG_H,table[num][0]);}

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