105_Arduino扩展DS1302

         尝试了一下传感器芯片的扩展，没有自己写代码，发现相应的代码开源的很多。我使用的库文件的仓库地址：https:///msparks/arduino-ds1302

         电路搭建缺少一个晶振，暂时没有输入，或许这是我最终测试的时候时间不变化的因素。根据我自己的电路，只是改了几个管脚的配置，之后的测试代码：

// Example sketch for interfacing with the DS1302 timekeeping chip.
//
// Copyright (c) 2009, Matt Sparks
// All rights reserved.
//
// http://quadpoint.org/projects/arduino-ds1302
#include <stdio.h>
#include <DS1302.h>

namespace
{

// Set the appropriate digital I/O pin connections. These are the pin
// assignments for the Arduino as well for as the DS1302 chip. See the DS1302
// datasheet:
//
//   http://datasheets.maximintegrated.com/en/ds/DS1302.pdf
const int kCePin = 13;   // Chip Enable
const int kIoPin = 28;   // Input/Output
const int kSclkPin = 27; // Serial Clock

// Create a DS1302 object.
DS1302 rtc(kCePin, kIoPin, kSclkPin);

String dayAsString(const Time::Day day)
{
    switch (day)
    {
    case Time::kSunday:
        return "Sunday";
    case Time::kMonday:
        return "Monday";
    case Time::kTuesday:
        return "Tuesday";
    case Time::kWednesday:
        return "Wednesday";
    case Time::kThursday:
        return "Thursday";
    case Time::kFriday:
        return "Friday";
    case Time::kSaturday:
        return "Saturday";
    }
    return "(unknown day)";
}

void printTime()
{
    // Get the current time and date from the chip.
    Time t = rtc.time();

    // Name the day of the week.
    const String day = dayAsString(t.day);

    // Format the time and date and insert into the temporary buffer.
    char buf[50];
    snprintf(buf, sizeof(buf), "%s %04d-%02d-%02d %02d:%02d:%02d",
             day.c_str(),
             , t.mon, t.date,
             t.hr, t.min, t.sec);

    // Print the formatted string to serial so we can see the time.
    Serial.println(buf);
}

} // namespace

void setup()
{
    Serial.begin(9600);

    // Initialize a new chip by turning off write protection and clearing the
    // clock halt flag. These methods needn't always be called. See the DS1302
    // datasheet for details.
    rtc.writeProtect(false);
    rtc.halt(false);

    // Make a new time object to set the date and time.
    // Sunday, September 22, 2013 at 01:38:50.
    Time t(2019, 5, 6, 1, 38, 50, Time::kSunday);

    // Set the time and date on the chip.
    rtc.time(t);
}

// Loop and print the time every second.
void loop()
{
    printTime();
    delay(1000);
}

         测试的效果：