Fermion: DS3231 Precise RTC (Breakout)

This Fermion DS3231 real - time clock (RTC) module is a game - changer. It uses the DS3231 chip that comes with an integrated crystal resonator and a temperature compensator. This unique combination greatly enhances the module's long - term accuracy. In the temperature range from - 40°C to + 85°C, it maintains an amazing accuracy of ±3.5ppm (±0.3024 seconds per day). The device has a battery input. Even when the main power is interrupted, it keeps precise timing. It offers a full range of time information including seconds, minutes, hours, week, day, month, and year. It can also automatically adjust the date at the end of each month, taking leap years into account. You can choose between 24 - hour and 12 - hour formats with an AM/PM indicator. There are two programmable time - of - day alarms and a programmable square - wave output. Additionally, the RST pin can be used as a push - button input to reset the microprocessor. Note that due to new air cargo regulations, this RTC module no longer comes with a battery. You can buy the CR1220 button cell battery locally. This module stands out with features like an internal integrated crystal resonator for small deviation, an integrated temperature compensator for small temperature drift, a complete clock calendar function, and two programmable time - of - day alarms. It's great for event reminders, as an MCU external wakeup source, and for clock and alarm output. With a power supply voltage of 3.3V - 5.5V, an I2C address of 0x68, a timing range from 1970 to 2100, a working temperature of - 40°C to + 85°C, and a timing accuracy of ±3.5ppm, it's a reliable choice. The product size is 22.5*21mm (0.89*0.83 inch). You can also refer to the product wiki for more details. The shipping list includes one Fermion DS3231 Precise RTC (Breakout) and one 2.54 - 7P Black Single Row Connector.

Using the Fermion DS3231 Real - Time Clock Module is quite straightforward. First, connect the module to your device according to the provided connection diagram. Make sure to check the I2C address (0x68) and set it correctly. You can choose the 24 - hour or 12 - hour format based on your preference. If you want to use the alarms, program them according to your needs. When it comes to power, use a power supply with a voltage between 3.3V and 5.5V. Remember, this module doesn't come with a battery due to shipping regulations. So, go to a local store and buy a CR1220 button cell battery. This battery will keep the module running when the main power is off. As for maintenance, keep the module in a dry and cool place. Avoid exposing it to extreme temperatures outside the - 40°C to + 85°C range. If you need to clean it, use a soft, dry cloth. Also, regularly check the connections to make sure they are secure. If you run into any problems, refer to the product wiki for solutions.