DS1307 Tiny RTC I2C modules 24C32 memory clock พร้อมแบตเตอรี่

DS1307 Tiny RTC I2C modules 24C32 memory clock

DS1307 I2C real time clock chip (RTC)
24C32 32K I2C EEPROM memory
Using LIR2032 rechargeable lithium battery and charging circuit with
DS1307 with battery backup can not solve the problem of literacy.
Fully charged, can provide DS1307 timing 1 year.
Compact design, 27mm * 28mm * 8.4mm
Leads to the DS1307 clock pin provides a clock signal for the microcontroller.
Other I2C devices can be cascaded.

DS1307 is a low power, with 56 bytes of non-volatile RAM clock calendar full BCD code real-time clock chip, the address and data via a two-wire bidirectional serial bus transmission, the chip provides seconds, minutes, hours and other information , the number of days of each month can be automatically adjusted. And there is a leap year compensation. AM / PM flag determines clock operates in 24 hours or 12 hours mode, the chip has a built-in power-sense circuit, brownout detect, and battery switching function.

DS1307 features:

Available on the second, hour, minute, number of days per month, month, week, count the number of days, and has a leap year compensation. Record on the line in 2100.

• 56 bytes of non-volatile RAM
• Two-wire serial interface
• Programmable square-wave output
• Automatic power-down detection and switching circuit
• In battery backup mode, power consumption is less than 500nA

ดาวน์โหลดไลเบอรี่

https://github.com/adafruit/RTClib

การต่อใช้งาน

GND - GND

VCC - 5V

SDA - SDA

SCL - SCL

#include

#include

#include "RTClib.h"

LiquidCrystal_I2C lcd(0x27,20,4); // LCD2004

RTC_Millis rtc;

String dt;

String ut;

void setup()

{

lcd.init(); // initialize the lcd

lcd.backlight();

lcd.print("start LCD2004");

rtc.begin(DateTime(F(__DATE__), F(__TIME__)));

delay(1000);

lcd.clear();

}

void loop()

{

lcd.setCursor(0,0);

lcd.print("S029:DS1307");

DateTime now = rtc.now();

dt = (String)now.year()+"/";

dt += (String)now.month()+"/";

dt += (String)now.day()+" ";

dt += (String)now.hour()+":";

dt += (String)now.minute()+":";

dt += (String)now.second();

lcd.setCursor(0,1);

lcd.print(dt);

ut = (String)now.unixtime();

lcd.setCursor(0,2);

lcd.print("unixtime="+ut);

}