Welcome to the wiki page of the control surface board featuring combo DINx4 and improved DOUTx4 modules with 16 LEDrings and 16 encoders.

You can find the tread of the PCB design here.

The last revision of the PCB is rev 2.5.

It is a very practical and cheap way to make a midi controller with adding only a core or make a more important controller without having to wire LEDrings.

The PCB have components soldered on the two sides.
Top side: Encoders and LEDs.
Back side: All others components (see BOM below).

The PCB is two sides white silkscreened on green FR4 material, 1.6mm thickness, 1Oz copper, HASL, 100% E-tested & ROHS compliant.

The board is 3,368 x 13,472 inch (342,2mm x 85,5mm): just less than 2U standard.
The diameter of each LEDring is 1,299 inch (33 mm) with the use of 3mm LED.

You can see the LEDring animation in this poorly quality video.

You can download a better definition version here.

You can download a better definition version (without ground surfaces for better visibility) here.

You can download Top silkscreen here.

You can download (mirrored) Bottom silkscreen here.

You can download a better definition version here.

The origin (0;0) is the bottom left corner of the board.

You will find the coordinates of LEDs/Encoders in this files (new version with better accuracy positioning!).

Coordinates of the six holes (in inch):

This is a Mouser Orderlist (Thank you Lamouette). You have only to add your LEDs and Pinheaders.

Since Tk discovered a brightness problem with some rectangular 5x2x7mm LEDs, we found it useful to create a list of LEDs wich are successfully or unsuccessfully tested. Members are welcome to edit this page to add their LED feedback.

Each LEDring is composed of 16 LEDs.
You can use 3mm LEDs or 5x2x7mm rectangular LEDs (because the different angles of the LEDs in the LEDring) or all other LED with 0.1 inch (2,54 mm) leads spacing.
There's not enough space for 5mm LEDs.

The LED polarity: the cathode (short leg) has to show to the center of the LED ring:

You can use 16mm “standard” encoders (ALPS STEC16, Bourns PEC16-4xxxF-Nxxxx series, encoders sell by voti, …).
You can use instead PEC16-4xxxF-Sxxxx series (with built-in switch). Probably others built-in switch encoders comply the PCB footprint but you have to compare before datasheets.

If you use switched encoders, one of the two pins of the built-in switch is grounded while the other pin is connected to a pin of this SIL connector.

The silkscreen include the name of each switch.

They are 1:1 with J8/J9 of Core8/Core32/LPC17 so you can use practical IDC female Connector or still more easier pre-built 2x5 Pin IDC Ribbon Cable.

Be careful to the connection to the MBHP_CORE_LPC17 module because it could be confusing, since the SO pin of J8/9 has to be connected to the SI pin of the LRE2x8 board, and SI to the SO pin (for MBHP_DOUT/DIN we usually have the same names for these signals, this detail has been overlooked).

This component provide more current to the matrix LED than the 74HC595 shift registers can and improve the brightness of the LEDs.
You can use or not Transistors Darlington arrays.
In the second case (and only in this case), you need to bridge 16 of the 18 free pins 2 by 2 (in red on the picture):

Be careful to not bridge the 2 last pins (those opposite to the “head” of the chip).

An idea is to use e.g. DIP16 Switch. (NT 08 at Reichelt).

As in the SmashTV's PCB, you can replace a DIL resistor network by 8 resistors.
In this case I recommend to use 1% metal film resistors because with the tolerance of standard carbon resistors you could see maybe different brightness of each LED of the LEDring.

Be careful when sourcing SIL resistor networks because a 6 Pin SIL resistor network can be 5 commoned resistors (what you need here) or 3 independant resistors.

It is the only polarized cap of the board. The silkscreen indicate the “+” and “-” signs on the board.

Only one 2×5 Pin IDC Ribbon Cable is necessary to connect the board.

You can download a better definition version here.

You can chain 4 of this board or connect yours extra DIN/DOUT modules e.g. on the DIL connector named “OUT”.
You can connect also this board at the end of the chain and connect this board with the “IN” connector after yours others modules.

With the use of the upcoming MIDIbox NG (planned for Winter 2012/13) you will be able to have 2 chains of 4 boards each (2x4x16=128 encoders and 2x4x16=128 LEDrings).

For an eventual next revision of the PCB, this is a list of improvements that members are free to complete:

• Changing IN/OUT sockets by polarized sockets and improving the silkscreen (to avoid confusing SI/SO pin). Tk Done
• Moving cap C5 (too close to the IN socket). Tk Done
• Trying to move some critical vias. Fairlightiii Done
• What about the use of ULN2803s? Fairlightiii Let them here for 8×2 configuration, not present on upcoming 4×2 and 8×1 boards
• Trying to add DINX2 onboard to handle the 16 encoder switches (start/end of the chain?). Fairlightiii Not planned to be implemented
• What about the size of the PCB? Fairlightiii Slightly less big (I won some mm in the edges)
• new arrangment of encoders and LED-rings in 4×4 matrix? MaG2k Upcoming 4×2 and 8×1 boards