January 20, 2026 - At the center of this module is the DS1307 – a low-cost, highly accurate I2C-based real-time clock (RTC) chip made by Maxim Integrated.

This is a great battery-backed real time clock (RTC) that allows your microcontroller project to keep track of time even if it is reprogrammed, or if the power is lost. Perfect for datalogging, clock-building, time stamping, timers and alarms, etc.

The DS1307 is a low-power clock/calendar with 56 bytes of battery-backed SRAM.

June 5, 2026 - /* * Created by ArduinoGetStarted.com * * This example code is in the public domain * * Tutorial page: https://arduinogetstarted.com/tutorials/arduino-ds1307-rtc-module */ // Date and time functions using a DS1307 RTC connected via I2C and Wire lib #include <RTClib.h> // event from 13:50 to 14:10 uint8_t DAILY_EVENT_START_HH = 13; // event start time: hour uint8_t DAILY_EVENT_START_MM = 50; // event start time: minute uint8_t DAILY_EVENT_END_HH = 14; // event end time: hour uint8_t DAILY_EVENT_END_MM = 10; // event end time: minute RTC_DS1307 rtc; char daysOfTheWeek[7][12] = { "Sunday", "Monday", "Tuesday", "Wednesday", "Thursday", "Friday", "Saturday" }; void setup () { Serial.begin(9600); // SETUP RTC MODULE if (!

Amazon.com: Ximimark 5Pcs I2C RTC DS1307 AT24C32 Real Time Clock Module for AVR ARM PIC SMD for Arduino : Electronics

January 11, 2023 - Time can be displayed in 12-hour format with AM and PM or in 24-hour format. ... The DS1307 chip requires a 32KHz external crystal oscillator to function (time-keeping). As a result, the RTC module has a 32KHz external crystal oscillator.

Amazon.com: DS1307 RTC Module, High Real Time Clock with Battery Backup for and DIY Electronics Projects Red Color 3 Pack : Electronics

SparkFun Electronics is an online retail store that sells the bits and pieces to make your electronics projects possible.

The output of the code is the current time and date obtained from the DS1307 RTC module. The program initializes the RTC module, sets the date and time, and starts the module. The output includes the current hour, minute, and second, followed by the current day, month, and year.

April 22, 2020 - The module based on DS1307, The DS1307 serial real-time clock (RTC) is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM. Address and data are transferred serially through an I²C, bidirectional bus.

March 24, 2025 - Learn how to use the DS1307 Real Time Clock Module with the ESP32. We’ll cover how to set and read the time. You’ll learn to synchronize the time with the ESP32 local time and with an NTP server periodically. We’ll also cover how to deal with time zones and daylight saving time. Finally, we’ll build an ESP32 digital clock using the DS1307 RTC ...

This module has a DS1307, a battery socket and three pull-up resistors on the PCB. It uses I2C protocol to communicate with external I2C master (Arduino board, PIC, AVR, etc.). The SQW/OUT pin of DS1307 is broke out via a 3-pin interlock connecter.

Grove - DS1307 RTC is based on the clock chip DS1307 and supports I2C communication! It uses a Lithium cell battery (CR1225). We choose to use the RTC based on DS1307 as it is low cost and also very energy efficient.

June 26, 2024 - You can see the DS1307 chip here. Battery Backup: Keeps track of time even during power outages. I2C Communication: Simple two-wire interface for easy connection with Arduino. Timekeeping: Provides seconds, minutes, hours, day, date, month, and year information. When selecting an RTC module for your project, you might come across the DS1302.