MAX7219 4x Dot matrix module

This dot matrix module contains 4 separate modules, each with its own MAX7219 driver and dot matrix display. These 'separate' modules are connected to each other and can be controlled together with only 3 data lines. This module has 4 x 8 x 8 = 256 individually controllable LEDs available and has the dimensions of 128 x 32 x 14 mm.It is possible that the displays are sometimes mounted upside down, it is useful to check this first.