The RGB LED matrix described here can be used to signal feedback to the user, as for example in my MIDI Matrix with 56 Inputs and 56 Outputs. But, it can also be used for fancy stuff, Vegas mode, bling, impressing your neighbours,…
The PCB is as wide as the RGB LED modules themselves, with enough space above and below for mounting holes. This means that the modules can easily be chained horizontally in order to create type crawls. If you cut off the top and bottom mounting holes along the line that is printed on the PCB then you can also create larger screens extending in two dimensions.
It consists of 4 DOUT shift registers (74HC595) that feed the RGB LED display module in a matrix style. It is connected to J8/J9 of the core board. In order to access the RGB LEDs, use the BLM-X module which makes it straightforward to access single colors / single LEDs in the matrix.
The schematic is simply a reproduction of the DOUTx4 board with the RGB-LED module connected in the correct way. Download the schematic of the MIDIbox RGB-LED Matrix here.
If you are interested in building this, send a personal message (PM) to user ilmenator over at the MIDIbox forum (you have to register to be able to send PM). As of summer 2014, I have PCBs available for 5€ each, as well as semi-kits for those having difficulties sourcing the parts (SMD parts and RGB LED modules) themselves.
|C1 - C4||capacitor||SM1210||100n||4|
|R1 - R24||1/4W resistor||SM1206||100||24||SMD 1/4W 100|
|U1 - U4||shift register||DIP-16||74HC595||4||74HC595|
|IC socket||DIL-16||4||GS 16|
|P1, P2||IDC connector||5×2||2||WSL 10|
|MATRIX1||RGB LED module||60x60mm||1|
|SIL precision sockets||16 pins||2|
An additional 5V power connector (P3) is not necessary. The RGB LED matrix modules can be found in various variants, e.g. with round or square LEDs. Search the web, you will find them starting from around 4€ per piece. They should follow the specifications defined in this document.