Witty Pi 4 HAT - RTC & Power Management for Raspberry Pi
58 units available with a short lead time.
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
Package 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
Note: Coin cell battery is not included and must be purchased separately.
Resources
The Witty Pi 4 HAT - RTC & Power Management for Raspberry Pi appears in the following collections:
SKU AF-5704
by Adafruit
