Adafruit
Witty Pi 4 HAT - RTC & Power Management for Raspberry Pi
The Witty Pi 4 is a Raspberry Pi HAT that adds a precision real-time clock, power management, and scheduling capabilities. Define ON/OFF sequences to signifi...
The Witty Pi 4 is a Raspberry Pi HAT that adds a precision real-time clock, power management, and scheduling capabilities. Define ON/OFF sequences to significantly reduce energy usage in battery-powered systems, or use temperature thresholds to trigger automatic startup and shutdown.
A built-in DC/DC converter accepts 6–30V DC input, and an e-latching power switch provides graceful shutdown — just like a PC power button. The board also supports 5V input via USB Type-C.
Key Features
- Real-Time Clock – Factory calibrated, temperature compensated, ±2 ppm accuracy
- Temperature Sensor – 0.125 °C resolution, usable for temperature-triggered actions
- DC/DC Converter – Accepts 6–30V DC input
- E-Latching Power Switch – Graceful shutdown via single button tap
- ON/OFF Scheduling – Time-based and temperature-based startup/shutdown sequences
- MCU – AVR 8-bit microcontroller with 8 KB programmable flash
- Single I²C Device – Default address 0x08 (configurable), proxies RTC and temperature sensor
- UWI Support – Web-based management via UUGear Web Interface
Compatibility
- Raspberry Pi A+, B+, 2B, 3B, 3B+, 3A+, 4B
- Raspberry Pi Zero, Zero W, Zero 2 W (requires soldered 40-pin header)
- Raspberry Pi OS (other Linux distributions may require manual configuration)
Installation
wget https://www.uugear.com/repo/WittyPi4/install.sh
sudo sh install.shPackage Contents
- 1× Witty Pi 4 board
- 1× 30 cm 22AWG XH 2.54 cable
- 4× M2.5 × 11 mm copper standoffs
- 8× M2.5 screws
Resources
Jargon buster
Plain-language definitions for the technical terms used above.
- AVR
- AVR is a family of 8-bit microcontrollers used in many classic Arduino-style boards. If a USB host library mentions AVR support, it suggests the examples or compatibility may be aimed at those older microcontroller boards.
- M2.5
- A metric screw thread size with a 2.5 mm nominal diameter. It matters for mounting because screws, standoffs, and holes must use the same size to fit securely without damaging the board.
- microcontroller
- A microcontroller is a small computer on a chip that runs your program and controls connected inputs and outputs. For this product, it is the part that reads buttons and sensors, drives the display and speaker, and communicates over Bluetooth.
- ppm
- ppm means parts per million, a common way to express very small gas concentrations in air. For CO₂ sensors, the ppm range tells you what levels the sensor can measure, such as normal indoor air through to poorly ventilated spaces.
- RTC
- A Real-Time Clock keeps track of time even when the main processor is asleep or powered down, usually with a small backup battery. It matters for data logging and tracking projects that need accurate timestamps.
- USB Type-C
- A reversible USB connector used for power and data on many modern devices. On this kit it indicates an alternate 5V power input, which may be useful for setup or charging without the solar panel.
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Brands
Raspberry Pi
