MIDI Drum Detector/Analyser
This unit utilizes MIDI Note ON/OFF data from a MIDI file player or
sequencer to switch ON/OFF LEDS, corresponding to the pre-selected
MIDI drums. So by watching the LEDs, which can be attached beside
real or practice drums, you can follow, practice and learn a MIDI drum
pattern.
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MIDI DRUM ANALYSER
ITEM#: MIDIDRUMANAL
PRICE: €35.00
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The MIDI Drum Analyser unit utilizes:
- A Miduino kit including a
suitable pre-programmed Atmega168,
- A 2.1mm power socket, and associated LED,
- Select MIDI channel at power-on, in
programme mode,
- Pre-select MIDI drum choices in
programme mode,
- A MIDI 5-pin DIN input socket,
- A MIDI 5-pin DIN output socket,
- The circuit schematic is available,
- A MIDI mode switch and associated LED, to allow unit to work with
MIDI via USB cable
The MIDI Drum Analyser also requires:
Normal Mode:
The unit detects the incoming MIDI data and if the MIDI channel corresponds
to the correct MIDI channel setting, when a corresponding Note-on is
detected, (to the pre-set MIDI drum selection), the corresponding output LED 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 LED to operate independently.
Operation:
The switch SW1 allows this unit to operate with the MIDI IN/OUT DIN
connectors (at 31250 Baud), if the switch is closed. If the switch is
open-circuit (or the switch is not connected) the unit can operate via
the USB cable (at 38400 Baud).
The MIDI drum analyser 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 to switch on LEDs for each selected drum so that
you can 'see' as well as hear a drum pattern being played, allowing you
to copy and learn that pattern.
This unit can utilize MIDI IN/OUT via USB with the FTDI USB cable or
with the standard MIDI IN/OUT connectors. If the USB cable is used to operate MIDI IN/OUT on the
Miduino, then the MIDI
to USB drivers need to be installed.
Assembly:
The assembly is straightforward and
well documented. This design does not include a USB chip, it is
designed to use a FTDI
USB 232-TTL cable to program the microcontroller. However since the cable plugs
directly into
the Miduino, you can use this one cable for multiple projects.
MIDI Wiring:
The MIDI IN and OUT connectors use 5-Pin 180 degree DIN
sockets. Note that the MIDI IN/OUT wiring
is polarised and the correct pins should be used.
Download:
Open the source
code file and copy and paste it into the Arduino programme and
save it as a .PDE file.
MIDI Specification:
Generally, MIDI drums are recorded/transmitted on MIDI channel 10.
However any channel (1-16) can be selected using the 4-way DIP switch selection
shown in Table 1.
|
DIP Switch
Selections |
MIDI
Channel
|
| 4 |
3 |
2 |
1 |
| on |
on |
on |
on |
1 |
| on |
on |
on |
off |
2 |
| on |
on |
off |
on |
3 |
| on |
on |
off |
off |
4 |
| on |
off |
on |
on |
5 |
| on |
off |
on |
off |
6 |
| on |
off |
off |
on |
7 |
| on |
off |
off |
off |
8 |
| off |
on |
on |
on |
9 |
| off |
on |
on |
off |
10 |
| off |
on |
off |
on |
11 |
| off |
on |
off |
off |
12 |
| off |
off |
on |
on |
13 |
| off |
off |
on |
off |
14 |
| off |
off |
off |
on |
15 |
| off |
off |
off |
off |
16 |
|
Table 1 MIDI Channel |
MIDI Specification:
The LED 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, the outputs will switch off if
a correct MIDI Note On with a velocity of 00 is
received. The unit also works in MIDI Running
Status mode.
Expansion:
The MIDI to 16 output units can be combined/expanded by connecting the
MIDI OUT of one unit to the MIDI IN of the following unit.
