Some example uses for a GuzuntyPI board:

IO Expander

There are several alternate IO Expansion cores, providing output heavy, input heavy and balanced configurations depending on the needs of your project.

This image shows the 16o8i core driving 16 LEDs.

LCD display driver

Drives an LCD display module using an open source linux framebuffer driver. Here you can see I've made a small daughter board to keep things tidy, but you can wire it up with a set of Female-Female DuPont jumpers instead. Find out more here.

7 segment driver

Drives a four digit, 7 segment LED display without CPU overhead.

Pulse Width Modulation

Provides either 8 PWM outputs at 5 bit resolution or 4 PWMs at 8 bit resolution.

Arduino interface

Allows programming and interaction with a 5 volt Arduino without risking damage to your Raspberry Pi. Here we're programming a bare bones arduino with only 6 wires of which two are supplying power to the ATMega MCU.