Raspberry Pi Zero WH
Adafruit RGB Matrix Bonnet
A 32x32 LED matrix with a HUB75 connection (available on e.g. Adafruit, Pimoroni, Aliexpress). I used this one.
A 5V 4A power adapter
Refer to the Adafruit instructions to set it up. I recommend to do the PWM mod, it completely removed noticeable flicker for me. This requires minor soldering.
The project is split into two parts:
a client script that is invoked from ncmpcpp’s config hooks or the CLI
a server script that runs on a raspberry pi connected to the LED matrix
Communication between client and server is handled by a 0MQ TCP socket.”