MIDI ANALYSER

Anyone who has ever tried to connect various pieces of MIDI controlled equipment together will understand the difficulty of not knowing what MIDI data is being transmitted down a MIDI cable. While there are a number of software MIDI analysers available, which will provide this information, they require the use of a computer. 

 

However a portable analyser would be  most useful when connecting up unfamiliar equipment in an external environment, so this design, utilizing the Miduino kit is a  battery powered, stand-alone, microcontroller unit.

    

 

	MIDI ANALYSER ITEM#: MIDANA PRICE:  €35.00

The MIDI Analyser unit utilizes:

• A Miduino kit including a suitable pre-programmed Atmega168,
• A 2.1mm power socket, and associated LED, 
• A MIDI 5-pin DIN input socket,
• A MIDI 5-pin DIN output socket,
• 18 off 0.1" pin-terminal outputs,
• The circuit schematic is available,

 

 

The MIDI Analyser unit also requires:

• A 9v battery or equivalent DC power source
• 17 LEDS
• 17 1K Resistors
• 1 Toggle Status/Channel mode switch

 

Operation:

A toggle switch allows the unit to detect either MIDI System messages or Channel Messages. Complete MIDI data information is available here.

 

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 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.

 

 

The MIDI System Messages displayed by the the corresponding LEDs are shown in Tables 1 and 2 below. If in Channel Message mode the corresponding LEDs for channels 1 to 16 are displayed.

 

 

MIDI MESSAGES

 

Table 1: Channel Voice Messages

   

 

   

 

 

Table 2: System Messages

   

 

 

LED Output Pin	MIDI Message Displayed
19	0xF0: //Begin System Exclusive 11110000 (F0)
18	0xF1: //MIDI Time Code 11110001 (F1)
17	0xF2: //Song Position Pointer 11110010 (F2)
16	0xF3: //Song Select 11110011 (F3)
15	0xF7: //End System Exclusive 11110111 (F7)
14	0xF8: //Timing Clock 11111000 (F8)
13	0xFA: //Start 11111010 (FA)
12	0xFB: //Continue 11111011 (FB)
11	0xFC: //Stop 11111100 (FC)
10	0xFE: //Active Sensing 11111110 (FE)
9	0xFF: //System Reset 11111111 (FF)
8	0x90: // Note-On Event 1001bbbb (9X)
7	0x80: //Note-Off Event 1000bbbb (8X)
6	0xB0: //Control Change 1011bbbb (BX)
5	0xC0: //Program Change 1100bbbb (CX)
4	0xD0: //Channel Pressure 1101bbbb (DX)
3	0xE0: //Pitch Bend 1110bbbb (EX)

 

 

If the data is not a System message then it is a Channel message which is  decoded by the software and the appropriate Channel number and Channel message LED displayed.