Pimoroni unicorn hat 8x8 rgb led matrix for raspberry pi model b pimoroni unicorn hat p the pimoroni unicorn hat 8 x 8 led matrix is specifically designed for the new a and b hat specification hardware attached on top the hat specification uses two dedicated pins on the extended 40 way gpio header to tell linux which drivers to load for whatever device has landed on top of the pi the unicorn provides 64 individually addressable rgb leds ws2812b which are driven by pwm to create dazz