This is a
MIDI wind controller. The Trombone interface
design uses a pressure sensor, suitable
amplifier and 14 switches to produce an
output which is translated into velocity
sensitive MIDI Note ON data.
The 14
switches are defined as 5 Position switches,
4 Partial switches and Octave 2,3,4,5 and 6
switches. The mapping
of the 14 switches is available. The breath
pressure sensor should have the full voltage range
(0-5V) to use for velocity/volume. Other switch
mapping settings are available on request.
The MIDI Channel
is preset to MIDI channel 1. The unit also
has Pitch Bend and Modulation control
inputs.
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MIDI TROMBONE ITEM#: MIDITROMBONE
PRICE: €35.00
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The MIDI Trombone interface utilizes:
- A Miduino kit including a
suitable pre-programmed Atmega168,
- A 2.1mm power socket, and associated LED,
- The MIDI channel is preset to channel 1,
- A MIDI 5-pin DIN output socket,
- A MIDI activity associated LED,
- 5 off 0.1" pin-terminal switch inputs,
- The circuit schematic is available,
The MIDI Trombone interface requires:
- A 9 Volt battery or equivalent 9 Volt DC power source,
- 14 momentary action (SPST) switches,
- A Breath pressure sensor plus interface amplifier
Circuit Schematic:
A circuit schematic of the
MIDI Trombone interface shows the Input Switch connections.
You can obtain a separate Breath pressure sensor
and build an interface amplifier.
This is the breath pressure sensor used in
the Akai Electronic Wind Instrument
(EWI). Note that if the Pitch Bend
or Modulation inputs are not used they
should be connected to Ground (GND). The HEX
switch mapping for the input
switches is also available.
Assembly:
The kit
includes all parts necessary, the assembly is straightforward and
well documented.
MIDI Wiring:
The MIDI OUT connection use 5-Pin 180 degree DIN
sockets. Note that the MIDI IN/OUT wiring
is polarised and the correct pins should be used.
Programming:
Note, because the MIDI IN Opto-coupler shares the same serial
input as the USB interface, when programming the Miduino the
MIDI IN connection has to be disconnected. 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 one cable for multiple Miduinos.
Download:
Open the source
code file and copy and paste it into the Arduino programme and
save it as a .PDE file. The MIDI Start Note, ON threshold, OFF
threshold and delay time are all defined at the start of the
program.
