Adafruit PiRTC - Precise DS3231 Real Time Clock for Raspberry Pi _MAKE_DISPLAY_OLED With different DSP settings

With different DSP settings

Control over UART (9600 Baud) via any microcontroller

Relays are rated 10A/24VDC and 250VAC

The Cam Case design provides space for battery upgrades for those wanting extra juice to power your kit for even longer

Adafruit PiRTC - Precise DS3231 Real Time Clock for Raspberry Pi _MAKE_DISPLAY_OLED With different DSP settingsThis is the best battery backed real time clock (RTC) you can get that allows your Raspberry Pi project to keep track of time if the power is lost. Perfect for data logging, clock building, NTP servers, time stamping, timers and alarms, etc. Equipped with a genuine DS3231 RTC, it works great with the Raspberry Pi and has native kernel support. The datasheet for the DS3231 explains that this part is an "Extremely Accurate IC Integrated RTC TCXO