Pico Unicorn Pack review

By Phil King. Posted

Want to add some sparkle to your Pico project? The Pico Unicorn Pack (£22/$23) offers a 16×7 matrix of bright RGB LEDs – that’s 112 in total – along with four programmable push-buttons. All you need is a Raspberry Pi Pico with soldered male pins and you can plug it into the Pico Unicorn’s dual female headers, found on the rear of the board.

You’ll also need to flash Pico with Pimoroni’s custom MicroPython UF2 firmware. This includes the MicroPython module for the Pico Unicorn, which you can import at the top of your programs. While not as sophisticated as the Python one for Pimoroni’s Unicorn HATs for Raspberry Pi computers, it does enable you to set individual pixels to RGB values (or a single value) and read button presses. Disappointingly, there’s no built-in function for scrolling text, although it can be done with a bit of know-how.

Pico Pong

Only two MicroPython code examples for Pico Unicorn are provided in Pimoroni’s GitHub repo, but doing a search for ‘Pico Unicorn’ on GitHub reveals a wide variety of programs created by the community, giving you an idea of the possibilities. Our favourite is a two-player game of Pong using the buttons as controls (magpi.cc/unicornpong). There’s even a funky plasma generator that enables you to scroll messages using a frame buffer (magpi.cc/unicornplasma). We also found a version of Conway’s Game of Life on the Pimoroni forums.

Those RGB LEDs are bright and very responsive. Controlled using the PIO state machines on Pico’s RP2040 chip, they’re updated in the background with very little CPU usage. In fact, it’s so fast that 14 bits of resolution can be achieved, resulting in smoother brightness transitions using gamma-corrected values. In short, it looks very impressive.



With a matrix of super-responsive RGB LEDs, it’s ideal for animations and even games using the tiny push-buttons.


Features: 16×7 RGB LED matrix, 4 × programmable push-buttons

Dimensions: 65 × 25 × 10 mm


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