UUGear Witty Pi 4 - Product Overview; Accurate Realtime Clock and ON;OFF Scheduling

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1. Product Overview

Witty Pi is an add-on board that adds realtime clock and power management to your Raspberry Pi. It

can define your Raspberry Pi’s ON/OFF sequence, and significantly reduce the energy usage. Witty

Pi 4 is the fourth generation of Witty Pi and it has these hardware resources onboard:

 Factory calibrated and temperature compensated realtime clock with ±2ppm accuracy.

 Dedicated temperature sensor with 0.125 °C resolution.

 On-board DC/DC converter that accepts up to 30V DC.

 AVR 8-bit microcontroller (MCU) with 8 KB programmable flash.

1.1 Accurate Realtime Clock and ON/OFF Scheduling

The realtime clock (RTC) on Witty Pi 4 has been calibrated in the factory and Witty Pi 4’s firmware

also makes temperature compensation for the crystal. This makes the RTC very accurate and the

actual annual error is limited within ±2ppm (about 1 minute per year). When your Raspberry Pi boots

up, the time stored in the RTC will overwrite the system time. As a result, your Raspberry Pi knows

the correct time even without accessing the Internet.

You can schedule the startup and/or shutdown of your Raspberry Pi, and make it a time-controlled