Yamaha MFC10

[nick83ola]

Hello!!!

I have a yamaha MFC10 midi foot controller that I use with my POD and g-major and to control my pc effects via midi.

I was thinking to convert it to midibox…

or

I have opened It and this foot controller have 3 board, a microcontroller board that have the power supply and a

custom made yamaha microcontroller and the midi in/out, a board that have 1 row of led and 1 row of switch,

a second board that have the 2nd row of switch and led, plus LED display and the buttons.

the 3 boards are connected with flat cable and all components are PDIP.

I was thinking to replace the microprocessor/power supply board with a midibox board with a custom layout

and to use the existing board to control the switch/led

i was thinking also to add a LCD to the main panel to display information like program name (better than the stock LED 2 char display)

and to mantain the existing LED 7 seg display to display program number (more visible on dark stages!!!)

I will keep you informed if anyone is interested with my progress

Cheers

Nicola Lunghi

ps

you can see information about this controller on:

http://www.yamaha.com/yamahavgn/CDA/ContentDetail/ModelSeriesDetail.html?CNTID=1158&CTID=#

[nILS]

“HEY YOU! YES, YOU! READ THE STICKY THREADS!!!”:

http://www.midibox.org/forum/index.php/topic,12845.0.html

“Please Read Before Posting New Topics: What is a “User Project”?”:

http://www.midibox.org/forum/index.php/topic,8954.0.html

[stryd_one]

Heheh, I was too slow

I will keep you informed if anyone is interested with my progress

Yes please. From your description, it sounds like this box is a prime candidate for “MIDIboxification”… Once it’s more complete (code, wiki doco, build instructions, etc) we can move this thread back to the User Projects area.

[nick83ola]

I have opened the case and traced the schematic of the two board.

The board 1 and 2 use a flat cable to connect to the main board.

all the led on the two boards are connected to SN74HC374 octal D-latch.

the microprocessor put the data on all the devices simultaneusly and then

activate the clock pin only to the selected devices

or the bus structure is this:

8 bits shared between all 5 HC374

5 bits connected each to 1 HC374 clock bit.

this for led displaying. (i think that the led are always on or off… no strobing)

ah all of the bus bit are tied with a 10k pullup to +5V

for the switch, all the switches are grouped by group of eight

and are connected like this

              1K        diode            switch

+5V ----////-—>|-----------/___--------- common “read enable” bit of the bus with a 10k pullup to +5V

                        |

bit of the bus-----|

there are 3 of these “array”, one in the board 2 for the foot switches, 1 in the board 1 for the footswitches, and 1 in the board 1

for select/save/ etc etc the tiny button below LED Display.

For switch reading I think that the micro pull down the “read enable” bit, read from the bus and check the bit that have a 0

so the bus have another 3 bit for enable the 3 read switch array.

I was wondering if the ucapps main module have the required pin for all of this…

Is needed an

8 bit port

another 8 bit for control (maybe an encoder?? 3 bit to 8???)

5 adc channel for 5 foot controller

Serial In/out

perhaps… USB??

I think that I need to develop a custom board that have all "on board and fit the case

with all the opening and put midibox inside, or to leave midios and develop a custom firmware

Cheers

Nicola Lunghi

ps excuse me for my bad english…

[nick83ola]

ecco lo schema semplificato del bus…