Quantity   Component name
1 × Button Pad 4x4 - LED Compatible Sparkfun COM-07835
1 × Button Pad 4x4 - Breakout PCB Sparkfun COM-08033
1 × Arduino Uno Sparkfun DEV-11021
1 × Accelerometer/Gyro 5 Degrees of Freedom Sparkfun SEN-11072 I put a 3-axis accelerometer and 2 axis gyroscope in this controller to give it some gestural control, but so far I haven't actually used the gyro in any apps, and I've only got the x and y axis of the accelerometer wired up. That means you could sub in a simpler/cheaper part like this: https://www.sparkfun.com/products/9652
16 × White 5mm LED (3mm is fine too) Digikey C513A-WSN-CV0Y0151-ND
3 × 74HC595 shift register Digikey 296-1600-5-ND
3 × 16 pin IC socket Digikey A100206-ND
16 × 1N4148 Diode Digikey 1N4148FS-ND
16 × current limiting resistors (value will depend on LEDs)
4 × 10kOhm 1/4watt resistors Digikey CF14JT10K0CT-ND
1 × 220Ohm 1/4watt resistor Digikey CF14JT220RCT-ND
1 × 5-Pin MIDI Jack Digikey CP-2350-ND (optional - only if you want this style of MIDI output)
1 × USB type B female jack Digikey 732-2734-ND (optional - this is for usb MIDI out)
2 × 10kOhm linear taper potentiometer Digikey 987-1308-ND
1 × 16 conductor ribbon cable Jameco 28RC16-10VP
1 × 16 pin right angle connector Jameco 746285-3
6 × male header pins Jameco 103393
1 × Midi Cable Radioshack 42-2149 (optional - only if you are using the 5 pin MIDI out))
1 × Size N Panel-Mount Coaxial DC Power Jack with switch Radioshack 274-1576
1 × Size N Coaxial DC Power Plug Radioshack 274-1573
1 × SPST Toggle Switch Radioshack 275-634
1 × Li-Ion 7.4V Tenergy 2200mAh Rechargeable Battery module with PCB Amazon
1 × Tenergy Universal Smart Charger for Li-Ion/Polymer battery Pack (3.7V-14.8V 1-4 cells) Amazon
1 × MIDI to USB cable Amazon (optional - only if you want to do usb MIDI out))
2 × Aluminum knobs Newark 74M6717
1 × 22 Gauge Wire, various colors Jameco #9313-0-R
1 × electrical tape Radioshack 64-2373
1 × wire cutters
1 × wire strippers
1 × solder
1 × wood/acrylic/project enclosure (I used this 6"x6"x2" bamboo box The Container Store) http://www.containerstore.com/shop/kitchen/drawerOrganizers/modular?productId=10023938
1 × glue/epoxy
1 × double sided foam tape Amazon