Hi all, just got the Unicorn HAT HD and wow the lights! After confirming the display worked on my RaspPi 2 I decided to try it detached from the board via some jumper wires. The Unicorn HAT HD pinout (pinout.xyz/pinout/unicorn_hat_hd) says it only needs 4 GPIO pins plus 5v and 3v3. So I carefully followed this and plugged in the wires as laid out. But wait, all I got was a line of red leds on the second row from the top.
After a bit of looking around I saw an old post here about the original Unicorn saying it wouldn’t work until the GND was plugged in, so I did that, turned on the Pi and ran the rainbow.py test and all burst into life!
Am I missing something or should it say that you need to use GND in the pinout diagram, anyway, I have posted this in the hope that it helps other hearties!
In this picture the colours are as follows:
Orange = 3v3
Brown = Pin 6 GND (the missing link!)
Blue = BCM 10 (MOSI)
Grey = BCM 9 (MISO)
Yellow = BCM 11 (SCLK)
Purple = BCM 8 (Chip Select)