{"product_id":"ds1307-rtc-module-v1-1-cr1220-battery-i2c-arduino","title":"DS1307 RTC Module v1.1 with CR1220 Battery - I2C Real Time Clock for Arduino","description":"\u003ch2 style=\"text-align:center;\"\u003eDS1307 RTC Module v1.1 with CR1220 Battery - I2C Real Time Clock for Arduino\u003c\/h2\u003e\u003cp style=\"text-align:center;\"\u003eKeep accurate time in your projects with the DS1307 Real Time Clock module. This OPEN-SMART RTC v1.1 board features the reliable DS1307 RTC IC, a pre-installed CR1220 backup battery to maintain time even when main power is off, a 32.768kHz crystal, and a clean 4-pin I2C interface - ready to connect to any Arduino, ESP32 or microcontroller in seconds.\u003c\/p\u003e\u003cp style=\"text-align:center;\"\u003e\u003cimg src=\"https:\/\/sidekick.shopify.ai\/rails\/active_storage\/blobs\/redirect\/eyJfcmFpbHMiOnsiZGF0YSI6MzUzNjU4MDY3OSwicHVyIjoiYmxvYl9pZCJ9fQ==--69db89ff045aeb97ec48fdb59a0d68c2ecab3f93\/WhatsApp_Image_2026-09-03_at_8.51.57_PM_3.jpeg\" alt=\"OPEN-SMART DS1307 RTC Module v1.1 with CR1220 battery and I2C header\" style=\"max-width:100%;height:auto;border-radius:8px;\"\u003e\u003c\/p\u003e\u003ch3\u003eKey Features\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eDS1307 RTC IC - accurate timekeeping: seconds, minutes, hours, day, date, month, year\u003c\/li\u003e\n\u003cli\u003eCR1220 coin cell battery pre-installed - maintains time without main power supply\u003c\/li\u003e\n\u003cli\u003e32.768kHz crystal oscillator - precise clock source included on board\u003c\/li\u003e\n\u003cli\u003e4-pin I2C interface: SCL, SDA, VCC, GND - easy connection to any microcontroller\u003c\/li\u003e\n\u003cli\u003eSQW \/ OUT pin - programmable square wave output for clock and interrupt applications\u003c\/li\u003e\n\u003cli\u003eCompact blue PCB with mounting holes - OPEN-SMART branded, quality construction\u003c\/li\u003e\n\u003cli\u003eCompatible with Arduino, ESP32, ESP8266, STM32 and Raspberry Pi\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003eSpecifications\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003e\n\u003cstrong\u003eRTC IC:\u003c\/strong\u003e Maxim DS1307\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eInterface:\u003c\/strong\u003e I2C (SCL, SDA)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eI2C Address:\u003c\/strong\u003e 0x68 (fixed)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eSupply Voltage:\u003c\/strong\u003e 3.3V - 5V DC\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBattery:\u003c\/strong\u003e CR1220 3V coin cell (included)\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eCrystal:\u003c\/strong\u003e 32.768kHz\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eOutput:\u003c\/strong\u003e SQW \/ square wave output pin\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eTimekeeping:\u003c\/strong\u003e Seconds, minutes, hours, day, date, month, year with leap year compensation\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003ePCB Color:\u003c\/strong\u003e Navy Blue\u003c\/li\u003e\n\u003cli\u003e\n\u003cstrong\u003eBrand:\u003c\/strong\u003e OPEN-SMART\u003c\/li\u003e\n\u003c\/ul\u003e\u003ch3\u003ePerfect For\u003c\/h3\u003e\u003cul\u003e\n\u003cli\u003eArduino and ESP32 Data Logger with Timestamps\u003c\/li\u003e\n\u003cli\u003eDigital Clock and Alarm Projects\u003c\/li\u003e\n\u003cli\u003eScheduled Automation and Timer Systems\u003c\/li\u003e\n\u003cli\u003eIoT Devices Requiring Accurate Timekeeping\u003c\/li\u003e\n\u003cli\u003eSmart Home Controllers and Event Schedulers\u003c\/li\u003e\n\u003cli\u003eBattery-backed Time Retention in Embedded Systems\u003c\/li\u003e\n\u003c\/ul\u003e\u003cp style=\"text-align:center;\"\u003e\u003cstrong\u003eOrder now and add reliable real-time clock functionality to any Arduino or ESP32 project.\u003c\/strong\u003e\u003c\/p\u003e","brand":"OPEN-SMART","offers":[{"title":"Default Title","offer_id":56014407893065,"sku":"MOD-DS1307-RTC-I2C-V11","price":160.0,"currency_code":"PKR","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0946\/9090\/2089\/files\/WhatsApp_Image_2026-09-03_at_8.51.57_PM_3.jpg?v=1788452675","url":"https:\/\/lahorestore.pk\/products\/ds1307-rtc-module-v1-1-cr1220-battery-i2c-arduino","provider":"Lahore Store","version":"1.0","type":"link"}