Arduino-時鐘

Arduino本身不具備時間記錄功能，需使用其他模組。DS1302模組是常用於時間記錄的選擇，搭配程式庫使用即可輕鬆實現，並可透過一個簡易的顯示螢幕來完成時鐘功能。

需要先下載DS1302跟TM1637這兩個函數，DS1302利用arduino程式庫管理員找到

TM1637的GitHub頁面 

TM1637函式庫直接下載

程式碼:
#include <ThreeWire.h>

#include <RtcDS1302.h>

#include <TM1637Display.h>

#define countof(a) (sizeof(a) / sizeof(a[0]))

#define CLK 11

#define DIO 12

TM1637Display display(CLK, DIO);

ThreeWire myWire(4, 5, 6); //接腳: DAT/IO, SCLK/CLK, RST/CE

RtcDS1302<ThreeWire> Rtc(myWire);

void setup()

{

    Serial.begin(9600);//鮑率57600

    display.setBrightness(7);

    Serial.print("compiled: ");

    Serial.print(__DATE__);

    Serial.println(__TIME__);

    Rtc.Begin();

    RtcDateTime compiled = RtcDateTime(__DATE__, __TIME__);

    printDateTime(compiled);

    Serial.println();

    if (!Rtc.IsDateTimeValid())

    {

        // Common Causes:

        //    1) 第一次使用但設備還沒跑好

        //    2) 電池電量低

        Serial.println("RTC lost confidence in the DateTime!");

        Rtc.SetDateTime(compiled);

    }

    if (Rtc.GetIsWriteProtected())

    {

        Serial.println("RTC was write protected, enabling writing now");

        Rtc.SetIsWriteProtected(false);

    }

    if (!Rtc.GetIsRunning())

    {

        Serial.println("RTC was not actively running, starting now");

        Rtc.SetIsRunning(true);

    }

    //判斷DS1302上紀綠的時間和編譯時的時間，哪個比較新

    //如果編譯時間比較新，就進行設定，把DS1302上的時間改成新的時間

    //now：DS1302上紀綠的時間，compiled：編譯時的時間

    RtcDateTime now = Rtc.GetDateTime();

    if (now < compiled)

    {

        Serial.println("RTC is older than compile time!  (Updating DateTime)");

        Rtc.SetDateTime(compiled);

    }

    else if (now > compiled)

    {

        Serial.println("RTC is newer than compile time. (this is expected)");

    }

    else if (now == compiled)

    {

        Serial.println("RTC is the same as compile time! (not expected but all is fine)");

    }

}

void loop()

{

    RtcDateTime now = Rtc.GetDateTime();

    printDateTime(now);//呼叫副函數

    Serial.println();

    if (!now.IsValid())

    {

        // Common Causes:

        //    1) the battery on the device is low or even missing and the power line was disconnected

        Serial.println("RTC lost confidence in the DateTime!");

    }

}

void printDateTime(const RtcDateTime &dt)

{

    char datestring[20];

    snprintf_P(datestring,

               countof(datestring),

               PSTR("%02u/%02u/%04u %02u:%02u:%02u"),

               dt.Month(),//月

               dt.Day(),//日

               dt.Year(),//年

               dt.Hour(),//小時

               dt.Minute(),//分鐘

               dt.Second());//秒

    Serial.println(dt.Minute());

    display.showNumberDecEx(dt.Hour(), 0b11100000, 2, 2); //前兩位數設定為小時

    display.showNumberDecEx(dt.Minute(), 0b11100000, true, 2, 2); //後兩位數設定為分鐘

    delay(1000);

}