STEM教育：用ATmega 328板和TM1638制作电子钟 🕒

小孩参加学校的机器人制作竞赛，剩下了一块Mini 的 ATmega 328 板和TM1638数显板，为了不白白浪费扔垃圾桶，我就拿来自学一下Arduino，好像还有点意思。今天编了一个电子钟小程序，也算是动起来了。找到这里分享一下。

因为学校只提供安装教程，没有讲解这些板子是怎么连接编程的，连板子的参数资料都没有提供，所以资料都是自己上网找的，花了点时间。为了简化程序，我在网上找到了TM1638的一个库文件，所以实际代码只需要几行。也没有安装时钟模块，所以钟走的不太准，而且一拔电得重设时间。所以也把按钮做成了可随时调节时钟。

具体代码如下：（程序文件和TM1638库文件见附件）[mw_shl_code=applescript,true]
#include <InvertedTM1638.h>
#include <TM1638.h>
#include <TM1638QYF.h>
#include <TM1640.h>
#include <TM16XX.h>
#include <TM16XXFonts.h>
//TM1638模块引脚定义
int DIO = 9;
int CLK = 12;
int STB = 13; //这里定义了那三个脚

TM1638 disp(DIO,CLK, STB);  //data,clk,stb

uint16_t  j = 0;
unsigned long TimeNow;

void setup ()
{
  TimeNow = Time2second(9174100);//initialization time day|hour|min|sec
}
void loop()
{
   unsigned long i;
   ++TimeNow;
   i=disp.getButtons();//time setting
   disp.setLEDs(i);
   switch (i) {
      case 1: //Reduce day
      case 4: //Reduce hour
      case 16: //Reduce minute
      case 64: //Reduce second
      TimeNow=second2Time(TimeNow);
      i= pow(10,(7-getBaseLog(2,i*2)));
      TimeNow=TimeNow + i;
      TimeNow = Time2second(TimeNow);
      break;
      case 2: //Add day
      case 8: //Plus hour
      case 32: //Plus minute
      case 128:  //Plus second
      TimeNow=second2Time(TimeNow);
      i= pow(10,(7-getBaseLog(2,i)));
      TimeNow=TimeNow - i;
      TimeNow = Time2second(TimeNow);
      break;
      default:
      // statements
      break;
}
   disp.setDisplayToDecNumber(second2Time(TimeNow), 0,false);
   delay(1000);
}

unsigned long second2Time(unsigned long DATA)             //convert second count to a time showing
{
  unsigned long second;
  unsigned long minute;
  unsigned long hour;
  unsigned long day;
  unsigned long result;
  second = DATA % 60;
  DATA = ceil(DATA/60);
  minute = DATA % 60;
  DATA = ceil(DATA/60);
  hour =  DATA % 24;
  DATA = ceil(DATA/24);
  day = DATA % 30;
  result = day * 1000000 + hour * 10000 + minute *100 + second;
  return result;
}

unsigned long Time2second(unsigned long DATA)             //convert a time showing num to second num
{
  unsigned long second;
  unsigned long minute;
  unsigned long hour;
  unsigned long day;
  unsigned long result;
  second = DATA % 100 % 60;
  DATA = ceil(DATA/100);
  minute = DATA % 100 % 60;
  DATA = ceil(DATA/100);
  hour =  DATA % 100 % 24;
  DATA = ceil(DATA/100);
  day = DATA % 100 % 30 ;
  result = day * 86400 + hour * 3600 + minute * 60 + second;
  return result;
}

int getBaseLog(int x, int y) //logx y）：
{
return log(y) / log(x);
}
[/mw_shl_code]

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