M240
MIDI to 24 Outputs
Courtesy/Thanks to: Tom Scarff
Description: The MIDI to 24 Outputs unit consists of:
channel at power-on, or in programme mode, shown in table 1
schematic is available in GIF format,
The MIDI to 24 outputs requires:
DC power source
Operation:
1) Normal Mode
2) Programme Mode
Normal Mode:
The unit detects the incoming MIDI data and if the MIDI channel corresponds to the DIP switch
MIDI channel setting, when a corresponding Note-on is detected, (to the pre-set note-on data), the corresponding output is switched on (+5 Volts) and stays on until the corresponding note-off is detected and
the output is switched off (0 Volts). This allows each output to operate independently.
Programme Mode:
At power-up, when switching on the unit, if the programme switch is pressed and
held on, then the unit will enter programme mode, and the programme LED is lit.
Now the first Note-on command from a MIDI keyboard or sequencer is detected and stored in the EEPROM. This note is
the first of 24 consecutive note values, associated with outputs 0 to 23.
After the Note-on is detected the unit goes into normal operating mode, and the programme LED is off. So the 24 outputs can be
programmed to operate consecutively from only the first Note-on command detected.
Programming the unit only has to be done once and the 24 values are stored internally in the EEPROM and the unit
will continue to operate in this mode, even when power is removed, until reprogrammed.
Purpose:
The MIDI to 24 output unit can be operated live in real time from a MIDI keyboard or from a
hardware/software sequencer with pre-programmed MIDI Note on/off data. The outputs can be used, via suitable interface circuitry, to switch electrical devices, such as lights, motors, pumps etc., in time with
the music. Use the outputs to control tape decks, or energize and synchronize auxiliary circuitry. This provides a direct interface to the world of analog electronics.
MIDI Specification:
The
outputs are switched ON via MIDI 'Note-On' commands and OFF by MIDI 'Note-off' commands. These MIDI commands are all channel (1-16) dependent. Also, all outputs will switch off if the 'All Notes-Off'
command is received. This MIDI command is channel independent.
| DIP Switch Selections | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
| MIDI Channel | |||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||||
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Comments
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Added 2016-08-01 17:42:45 by laamma
Hello Pirvcb , I need the correct files to realize the decoder MIDI to 24 out . I would use the pic 16F877A you can send me .asm .hex file for this project ? Thank you
Added 2016-03-11 07:33:38 by Robi1
Hi,pirvcb. I got the kit from Tom many years ago, and want to use it now for a friend's college project.I also want a spare PIC (in case I damage the existing one). Tom couldn't help and the hex file on his old site didn't work. Any cures? I seem to be in the same situation as PIC_Novice... Help! Please!
Added 2015-08-21 06:40:00 by Tiller
Hi pirvcb. Any chance you can email me a copy of the working firmware or hex file? It would be most appreciated. Thank you
Added 2013-12-05 12:07:55 by PIC_Novice
Hi, can someone upload or attach working (updated) source code and compiled hex for this project (Midi to 24 outputs by Tom Scarrf)? Thanks...
Added 2010-03-06 22:33:20 by pirvcb
I've got trouble like you with this project, then i wrote an e-mail to the autor Tom Scarff and him, very kindly, sent me un updatet firmware version that's works fine. I've also compiled this firmware for 16F877A. If needed i can send a copy by e-mail. let me know...
Added 2010-02-11 17:47:42 by hannelore
Do You get the HEX file to work ? Tony
Added 2009-06-07 18:08:46 by botsmaker
I loaded the hex file to this project on a 16f877 but the program fails to work. Is the HEX file up to date?