The DS1307 Serial Real-Time Clock is a low-power, full binary-coded decimal (BCD) clock/calendar plus 56 bytes of NV SRAM, Real-time clock (RTC) counts seconds,minutes, hours, date of the month, month, daof the week, and year with leap-year compensation valid up to 2100.
Mini Real-Time Clock module, basically designed for Raspberry Pi, but can also be used with arduino boards.
Work in 3.3V and 5V
DS3231 RTC IC
Supported Raspberry Pi and Arduino
Length: 14 mm
Height: 12 mm
This is a module made using DS3231 RTC and AT24C32 EEPROM. DS3231 is an extremely accurate, low cost I2C RTC with integrated temperature compensated crystal oscillator.It also has a built in comparator which monitors the status of VCC to detect power failures and to automatically switch to back..
This tiny RTC module is based on the clock chip DS1307 which supports the I2C protocol. It uses a Lithium cell battery (CR1225). The clock/calendar provides seconds, minutes, hours, day, date,month, and year information. The end of the month date is automatically adjusted for months with fewer than ..