How to Build a MIDI Controller (Hardware)

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Detailed description of the building steps of a MIDI Controller. This article contains all the information you need: hardware schematics, micro-controller firmware and PC software to test. It was originally designed by Andras Fuchs in 2006, but it should work with the most recent DJ-software like Native Instruments Traktor without any problem.

Steps

1. 1

   
   

   • Some of the hardware design files were created by Orcad 9.
   • To program the Atmel ATMega8 8-16PI you will need a serial port on your PC/Mac, and probably a Atmel programmer hardware.
   • You must to be able to put the hardware pieces together, so you need basic electronic tools and skills to do so.
   • Atmel programming experience is not required but it is definitely a plus.
2. 2
   Versioning
   • The latest hardware revision number is 9, which was last modified on 2005.08.30.
   • The software has the revision H, which was last modified on 2006.06.13.
3. 3
   Schematics
   • 

     
     

     
     

     Base_rev9
     

     Panel_rev9
4. 4
   Build the hardware
5. 5
   Firmware
   • Download the firmware source or binary.
   • 

     PonyProg security bits.
     Run PonyProg and set the security bits like this.
6. 6
   Test MIDI signals
7. 7
   Mapping
   • Download the mapping file for Traktor File:mapping.tks
   • 

     Template for mapping
     Print the mapping template
8. 8
   Gallery
   • 

     Mixer01
     

     Mixer02
     

     Mixer03
     

     Mixer04
     

     Mixer05

   
   

Warnings

• There is some bugs in the firmware, so rarely it did an "auto-reset" which caused little "jumps" in the controls.
• This article is better to be looked at like a starting point of a development, not a final product.
• We are not going to work with high voltage / high currents but safety is always should come first

Things You'll Need

• Software:
• Orcad 9 (or compatible) (hardware design tool)
• AVR Studio (Atmel IDE and compiler)
• MIDI-OX (MIDI tester)
• PonyProg (serial device programmer)
• Hardware:
• 1x Atmel ATmega8 8-16PI (uController 8K flash, 1K RAM DIP 28 512b EEPROM)
• 6x CD4051C or CD4051BE (8-channel analog multiplexer, DIP16)
• 2x CD4053 (triple 2-channel analog multiplexer, DIP16)
• 1x 74HC139 (double 2/4 demultiplexer DIP16)
• 2x 74HC594 (8 bit, DIP16)
• 2x 2N 2222A *N (75/40V, 800 mA, P=500mW, TO-18)
• 2x 40-pin IDE cable
• 1x 5 Volt two-state switch
• 17x 6FAM 10kOhm potmeter
• 1x 6N139 (TOS, 2,5 KV OPCS/TTL-CMOS)
• 1x 7805 BT (Voltage regulator)
• 16x DIL16P (DIP16 socket)
• 1x DIL28P (DIP28 socket)
• 2x 1N4148 (75V 100mA diode)
• 4x 220 Ohm resistance
• 2x 330 Ohm resistance
• 18x 1k Ohm resistance
• 1x 10k Ohm resistance
• 27x 1M Ohm resistance
• 17x rotating potmeter
• 1x 22pf capacitor
• 1x 22uF (16V) capacitor (electrolit)
• 2x 27pF capacitor (ceramic)
• 1x 16 Mhz/30ppm (HC-49/U4H) crystal
• 18x 3mm, 5V, red led
• 26x mini-push button (T609 or DTE 6Q-SW)

Sources and Citations

• Cadence Orcad: http://www.cadence.com/products/orcad/pages/default.aspx
• Atmel ATmega8: http://www.atmel.com/dyn/resources/prod_documents/doc2486.pdf
• AVR Studio: http://www.atmel.com/dyn/Products/tools_card.asp?tool_id=2725
• PonyProg: http://www.lancos.com/prog.html
• MIDI-OX: http://www.midiox.com/
• Orcad, Source and configuration files: http://www.naplampa.hu/MIDIMixer/MIDIMixer_public.7z
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