The datasheet for the DS3231 explains that this part is an "Extremely Accurate I²C-Integrated RTC/TCXO/Crystal". And, hey, it does exactly what it says on the tin! This Real Time Clock (RTC) is the most precise you can get in a small, low power package.
Most RTCs use an external 32kHz timing crystal..
A Feather board without ambition is a Feather board without FeatherWings! This is the DS3231 Precision RTC FeatherWing: it adds an extremely accurate I2C-integrated Real Time Clock (RTC) with a Temperature Compensated Crystal Oscillator (TCXO) to any Feather main board. This RTC is the most pr..
Supports Raspberry Pi A+/B+/2B
dual LED, joystick, buzzer, the basic components
CP2102, control the Pi through serial terminal
0.96inch OLED, big world in the little screen
DS3231, high precision, backup battery holder is also available
PCF8591, 8-bit resolution, scre..
This is a Super Capacitor (versus a battery) Real-Time Clock module designed for Raspberry Pi, but can also be used with Arduino.
Pluging it into Raspberry Pi GPIO interface, and all is ok. This is the easiest way to keep it in time.
Work in 3.3V and 5V