Witty Pi is small electronic circuit board that can add a real-time clock and power management to your Raspberry Pi. The Witty Pi 3 Mini is a new member of the third generation of Witty Pi, and it has pHAT shape (Raspberry Pi Zero size).
Features
The Witty Pi 3 mini is packed with power management features such as:
You cangracefullyturn on/off Raspberry Pi with single tap on the switch.
After shutdown, Raspberry Pi and all its USB peripherals’ power are fully cut.
Raspberry Pi knows the correct time, even without accessing the Internet.
Raspberry Pi knows the temperature thanks to the sensor in RTC chip.
You can schedule the startup/shutdown of your Raspberry Pi.
You can even write a script to define complex ON/OFF sequence.
Monitor external voltage and turn on/off your Raspberry Pi accordingly.
Raspberry Pi Support
The Witty Pi 3 Mini supports all Raspberry Pi models with a 40-pin GPIO header, including A+, B+, 2B, Zero, Zero W, 3B, 3B+, 3A+ and 4B.
Software
The Witty Pi 3 Mini uses the same software as the Witty Pi 3. You just need to run these two commands in your Raspberry Pi to install the software:
Comparing to the Witty Pi 3, the Witty Pi 3 Mini uses the same RTC chip (DS3231SN) and same micro-controller (ATtiny841). The main difference is the LDO voltage regulator (LM29150) which is not populated on the Witty Pi 3 Mini. This reduces the cost for those who don’t need an LDO, and also makes things easier to integrate a different DC/DC module into the Witty Pi 3 Mini.
The Witty Pi 3 Mini uses a super capacitor (0.08F, or 80000uF) instead of the coin-cell battery used in the Witty Pi 3 for time keeping via the built-in RTC.
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