History MIDI Organ Photo page Links News Archive SALE
GINO MIDI Interface     Components for building your own MIDI Organ. 

GINO MIDI Interface
FATAR Keyboards
Complete Sets



Small-Midi 3
Ordercode: SM-MIDI3-B Assembly kit
Ordercode: SM-MIDI3-G Assembled and tested

This GINO-MIDI Interface is very compact.  It measures only 86 x 59 mm. It is really small. Take a look at the picture.

The heart (brain) of the interface is the Atmel microcontroller AT89C2051. This circuit can be powered by a very simple (Wal-Mart?) adaptor that delivers between 8 and 12 volts. This circuit consumes approximately 23 mA.

A 20-wire flatcable, the earlier mentioned GINO-BUS chains the decoders and diode-matrices. Take a closer look at the download page for the electrical schems. Click on one of the links below for photo's and partlist.


A 20-pin ribbon cable, called the GINO-BUS goes to the decoder-PCB's or the Decoder_Matrix-PCB's which are connected on the keyboards, pedal or registry panel.

With the GINO-BUS you can build your modular MIDI organ.
This small interface is the heart of your MIDI organ.





Ordercode: BIGMIDI-B Assembly kit
Ordercode: BIGMIDI-G Assembled and tested

The BIGMIDI interface I've designed, as there is more and more need for a larger midi interface. The BIGMIDI consists of a main board with the microcontroller where the MIDI Out can be connected, the volume controls and power supply. In addition, an expansion is possible through an LCD and Switch print on which a variety of parameters can be set. On this Switch and LCD print there is an LCD display and three function keys. The BIGMIDI functions without this expansion, but one miss the opportunity to set the various parameters to your liking.

If the full capacity of the BIGMIDI is used, one can connect 8 arrays of 64 = 512 switches on the BIGMIDI. Those are 6 manuals  and/or pedal all 64 keys (61 is normal for a 5 octave keyboard) and 2 stop panels all 64 switches.


In addition, the possibility exists to connect volume regulators (potentiometers) for up to 6 keyboards and / or pedal.
Everything is read in a phenomenal rate by the microcontroller. The program of this microcontroller is written in machine language and guarantees a rapid processing of the instructions. The used microcontroller is the Atmel ATMEGA8535.
This microcontroller offers amongst other features also an EEPROM memory, in which we capture and retain various settings even if the microcontroller is switched off.
Using the function keys on the LCD and switch print one can set various parameters.


Expansion with the LCD and Switch print
Ordercode: LCD&SW-B Assembly kit
Ordercode: LCD&SW-G Assembled and tested

The following settings are available: 

Change first keynumber
Using the function keys one can transpose the BIGMIDI, lower or up to 13 semitones. So in semitones up or down by a maximum of one octave.

Change port numbers
Using the function keys one chooses the matrix (= keyboard) number. The current channel number is displayed and can be modified in the desired number from 1 to 16. For each manual so you can change the channel number.

P-C change
This is the P-C parameter. This parameter determines which MIDI messages are transmitted off the matrices 1 and 5. These are namely the matrices used for the rstops panel. A total of 2 x 64 switches can be connected to this. The default setting for the switches that are connected to these matrices give the code Note MIDI Note on and off. That is the same code as a normal keyboard. But it may also be that your MIDI devices better listen to the midi code Program Change On and Program Change Off. This  however depends on the software you use on your computer such as Hauptwerk, jOrgan and so on. Many software can handle both sort of codes, but it is possible that the software adheres strictly to the MIDI protocol and it's nice if the midi hardware can anticipate them.

Save parameters
The above chosen parameters can now be stored in permanent memory.

Default parameters
When pressing F1 and switching on, the default parameters loaded.

The F3 function key gives PANIC event of an All Notes Off for all channels. (Never happened to me)

Potmeters/volume meters.
You can connect up to 6 pots each belonging to one of the six matrices. Namely matrix 2, 3, 4, 6, 7 and 8. Even if the channel numbers of these ports / matrices change, so is the channel numbers of the volume poten-tiometers. The value of the  potentiometers is 100K linear.


Midi Event
On the LCD and Switch print there is an LED lamp that lights when a midi signal is transmitted.

Start | GINO MIDI Interface | Matrices | FATAR Keyboards | Downloads | Order | Complete Sets | Contactinformation

Copyright 2015 by GINO-ELECTRONICS - All Rights Reserved.
If you have problems or questions about
this website, please contact me by this email adress [info@gino-midi.nl].
Last update: 05 mei 2015.