Unicorn HAT HD works in basically the same way as both Unicorn HAT and Unicorn pHAT, which just have less LEDs. We’ve got a Getting Started with Unicorn pHAT tutorial that should give you some tips.
But to get you started, if you open a terminal on your Pi and type the following, then it will light the top left LED in white:
unicornhathd.set_led(0, 0, 255, 255, 255)
unicornhathd.set_led() function takes the following variables:
x, y, r, g, b where
y are the coordinates of the pixel from the top left corner beginning at 0, 0, and
b are red, green, and blue values from 0 to 255.
You can set any number of the pixels and then call
unicornhathd.show() to push the data to the Unicorn HAT HD and display it. There are some tips in that Unicorn pHAT tutorial on how to use
for loops to update groups of pixels all in one go too.
Just let us know if you need any more help, or if you have specific things you’d like to do. :-)