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Witty Pi 4

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.

Virtual Registers for Temperature Sensor and Real-Time Clock

The temperature sensor and Real-Time Clock are accessible through the WittyPi 4 I2C device address (0x08), and are mapped to so called virtual adresses. The LM75B temperature sensor is mapped to #50 .. #53, while the PCF85063A Real-Time Clock is mapped to #54 .. #71. More details can be found in the user manual.