1. Arduino UNO主板 x 1
2. DS1307 RTC
DS1307 RTC：https://www.arduino.cc/reference/en/libraries/ds1307rtc/
SCL --> arduino A5
SDA --> arduino A4
VCC --> arduino 5V
GND --> arduino GND
設定RTC時間和電腦相同
#include <Wire.h>
#include <TimeLib.h>
#include <DS1307RTC.h>
const char *monthName[12] = {
"Jan", "Feb", "Mar", "Apr", "May", "Jun",
"Jul", "Aug", "Sep", "Oct", "Nov", "Dec"
};
tmElements_t tm;
byte adjustt = 9; // 修正編譯上傳的時間差 adustment for seconds lag allowing for compiler download time
void setup() {
bool parse=false;
bool config=false;
// get the date and time the compiler was run
if (getDate(__DATE__) && getTime(__TIME__)) {
parse = true;
// and configure the RTC with this info
if (RTC.write(tm)) {
config = true;
}
}
Serial.begin(9600);
if (parse && config) {
Serial.print("DS1307 configured Time=");
Serial.print(__TIME__);
Serial.print(", Date=");
Serial.println(__DATE__);
} else if (parse) {
Serial.println("DS1307 Communication Error :-{");
Serial.println("Please check your circuitry");
} else {
Serial.print("Could not parse info from the compiler, Time=\"");
Serial.print(__TIME__);
Serial.print("\", Date=\"");
Serial.print(__DATE__);
Serial.println("\"");
}
}
void loop() {
}
bool getTime(const char *str)
{
int Hour, Min, Sec;
if (sscanf(str, "%d:%d:%d", &Hour, &Min, &Sec) != 3) return false;
tm.Hour = Hour;
tm.Minute = Min;
tm.Second = Sec + adjustt;
return true;
}
bool getDate(const char *str)
{
char Month[12];
int Day, Year;
uint8_t monthIndex;
if (sscanf(str, "%s %d %d", Month, &Day, &Year) != 3) return false;
for (monthIndex = 0; monthIndex < 12; monthIndex++) {
if (strcmp(Month, monthName[monthIndex]) == 0) break;
}
if (monthIndex >= 12) return false;
tm.Day = Day;
tm.Month = monthIndex + 1;
tm.Year = CalendarYrToTm(Year);
return true;
}
2. 在LCD上顯示時間
#include <Wire.h>
#include <TimeLib.h>
#include <DS1307RTC.h>
#include <LiquidCrystal_I2C.h>
LiquidCrystal_I2C lcd(0x27, 2, 1, 0, 4, 5, 6, 7, 3, POSITIVE); //設定LCD
void setup() {
Serial.begin(9600);
lcd.begin(16, 2); //初始化 LCD，代表我們使用的LCD一行有16個字元，共2行。
lcd.backlight(); //開啟背光
}
void loop() {
tmElements_t tm;
if (RTC.read(tm)) {
Serial.print("Ok, Time = ");
print2digits(tm.Hour);
Serial.write(':');
print2digits(tm.Minute);
Serial.write(':');
print2digits(tm.Second);
Serial.print(", Date (D/M/Y) = ");
Serial.print(tm.Day);
Serial.write('/');
Serial.print(tm.Month);
Serial.write('/');
Serial.print(tmYearToCalendar(tm.Year));
Serial.println();
} else {
if (RTC.chipPresent()) {
Serial.println("The DS1307 is stopped. Please run the SetTime");
Serial.println("example to initialize the time and begin running.");
Serial.println();
} else {
Serial.println("DS1307 read error! Please check the circuitry.");
Serial.println();
}
delay(9000);
}
lcd.home(); //LCD歸零，清除所有內容
lcd.clear(); //LCD歸零，清除所有內容
lcd.setCursor(0, 0); // 設定游標位置在第一行第一個字
lcdprint2digits(tm.Hour);
lcd.write(':');
lcdprint2digits(tm.Minute);
lcd.write(':');
lcdprint2digits(tm.Second);
lcd.setCursor(0, 1); // 設定游標位置在第二行第一個字
lcd.print(tm.Day);
lcd.write('/');
lcd.print(tm.Month);
lcd.write('/');
lcd.print(tmYearToCalendar(tm.Year));
delay(100);
}
void print2digits(int number) {
if (number >= 0 && number < 10) {
Serial.write('0');
}
Serial.print(number);
}
void lcdprint2digits(int number) {
if (number >= 0 && number < 10) {
lcd.write('0');
}
lcd.print(number);
}