Witty Pi 3 RTC & Power Management for Raspberry Pi Boards

• Witty Pi 3 RTC & Power Management for Raspberry Pi Board
• Adds realtime clock and power management to your Raspberry Pi
• Supports Raspberry Pi models A+, B+, 2B, Zero, Zero W, 3B, 3B+, 3A+ and 4B
• Uses the DS3231SN RTC chip
• Comes with the new micro-controller ATtiny841
• Accepts DC voltage higher than 5 V

The Witty Pi 3 RTC & Power Management for Raspberry Pi Board is the third generation of Witty Pi, and it is the descendant of Witty Pi 2. It adds realtime clock (RTC) and power management to your Raspberry Pi, and can define complex ON/OFF sequence with simple script. Witty Pi 3 supports all Raspberry Pi models with 40-pin header, including A+, B+, 2B, Zero, Zero W, 3B, 3B+, 3A+ and 4B.

Comparing to Witty Pi 2, Witty Pi 3 uses the same RTC chip (DS3231SN) and introduces a new micro-controller (ATtiny841), which allows it to behave smarter and handle more complex situations. Thanks to the new on-board switching DC/DC converter (MP4462), Witty Pi 3 can accept up to DC 28V without adding extra heat sink, and still keeps the efficiency above 80%, which is indeed a comprehensive improvement.

Witty Pi 3 Rev2 comes with the newer version of firmware (V1.03, with ID=0x23). This firmware allows setting the power cut delay to a bigger value (up to 25.0 seconds). The purpose of this update is to workaround the boot delay caused by USB boot or NOOBS.