The DS3231 module is a bread board friendly highly accurate I2C real time clock module. This module is built using DS3231 RTC and AT24C32 EEPROM which is integrated with temperature compensation crystal oscillator. It also has a built-in comparator that monitors the VCC status to detect power failures and automatically switch to the backup power supply. The AT24C32 provides 32,768 bits of serial EEPROM arranged as 4096 words of 8 bits. It gives you 32 KB of non-volatile memory for your projects. This module can be easily interfaced with Arduino board, Raspberry Pi and all microcontrollers.

The tiny RTC module is based on the clock chip DS1307 with I2C supporting protocol. It can work for a year with its full charged battery. It is used for applications such as datalogging , timing application and many more. It also allows to keep reasonably accurate time even when  Arduino is power off.It has features like automatic power fail detecation , battery backup function and many more.

The real time clock module is based on the DS1302 chip with battery included.it use simple serial interface. The clock use either format of 24 hours and 12 hours with AM/PM indicator. The codes are easily available for Arduino, Raspberry Pi and many others. It has dual power tube .

The real time clock module is based on the DS1302 chip without including battery .it use simple serial interface. The clock use either format of 24 hours and 12 hours with AM/PM indicator. The codes are easily available for Arduino, Raspberry Pi and many others.