MIDI TRUMPET

MIDI Trumpet

This is a MIDI wind controller. The Trumpet interface design uses a pressure sensor, suitable amplifier and 5 switches to produce an  output which is translated into velocity sensitive MIDI Note ON data. The mapping of the 5 switches (representing the trumpet valves) is available. The breath pressure sensor should have the full voltage range (0-5V) to use for volume. Other switch mapping settings are available on request. The MIDI Channel can be selected with a 4-way DIP switch. 

 

 

 

	MIDI TRUMPET  ITEM#: MIDITRUMPET PRICE:  €35.00

 

 

 

The MIDI Trumpet interface utilizes:

• A Miduino kit including a suitable pre-programmed Atmega168,
• A 2.1mm power socket, and associated LED, 
• A 4-way DIP switch, which selects the MIDI channel, shown in table 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 Trumpet interface requires:

• A 9 Volt battery or equivalent 9 Volt DC power source,
• 5 momentary action (SPST) switches,
• A Breath pressure sensor plus interface amplifier 

 

Circuit Schematic:

A circuit schematic of the MIDI Trumpet 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). 

 

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:

 

#define startNote 48 // Start note of C#define ON_Threshold 100 // Set noise threshold level before switching ON#define OFF_Threshold 100 // Set LOW level to switch OFF#define ON_Delay 10 // Set Delay after ON-Threshold is reached, to measure velocity (max volume) of note">
#define startNote 48 // Start note of C
#define ON_Threshold 100 // Set noise threshold level before switching ON
#define OFF_Threshold 100 // Set LOW level to switch OFF
#define ON_Delay 10 // Set Delay after ON-Threshold is reached, to measure velocity (max volume) of note