## Electronics Stuff

* [Resistor Color Codes]
  (http://www.ladyada.net/wiki/lib/exe/fetch.php?hash=a2c6a9&w=501&h=785&media=http%3A%2F%2Fwww.ladyada.net%2Fimages%2Fmetertutorial%2Frescolorcode.jpg)
  : image

    * from [the Multimeter Tutorial]
      (http://www.ladyada.net/learn/multimeter/resistance.html)
      (on <http://ladyada.net/>)

* [Schematic Symbols]
  (http://img.docstoccdn.com/thumb/orig/28066054.png)
  : image

* [Vcc, Vdd, Vss, etc.]
  (http://encyclobeamia.solarbotics.net/articles/vxx.html)

* [Very Basic Circuits]
  (http://www.seattlerobotics.org/encoder/mar97/basics.html)
  : column by Kevin Ross for Encoder

* [Powering Light Emitting Diodes(LEDs)]
  (http://wolfstone.halloweenhost.com/Lighting/litlpo_PoweringLEDs.html)

    * can also be reached via <http://thewolfstone.com/>
      -> [ENTER] ('http://thewolfstone.com/Welcome/Home.html)
      -> [Wolfstone's Haunted Halloween Page]
         (http://thewolfstone.com/_ar/Halloween.html)
      -> [technology]
         (http://wolfstone.halloweenhost.com/Navigation/TechBase.html)
      -> [powering LEDs]
         (http://wolfstone.halloweenhost.com/Lighting/litlpo_PoweringLEDs.html)

* [All About Circuits : Reference]
  (http://www.allaboutcircuits.com/vol_5/index.html)

* [Effects of Varying I2C Pull-Up Resistors]
  (http://dsscircuits.com/articles/effects-of-varying-i2c-pull-up-resistors.html) : article by Wayne Truchsess


## C Stuff

* [comp.lang.c Frequently Asked Questions]
  (http://c-faq.com/index.html)

* [The C Preprocessor]
  (http://gcc.gnu.org/onlinedocs/gcc-2.95.3/cpp_1.html#SEC1)
  (on <http://gcc.gnu.org/>)

* [C Library Reference]
  (http://www.cplusplus.com/reference/)
  (on <http://cplusplus.com>)

* [C Operators/Expressions]
  (http://www.lix.polytechnique.fr/~liberti/public/computing/prog/c/C/CONCEPT/expressions.html)
  (on <http://www.lix.polytechnique.fr/>)

* [Bitwise Operators in C and C++: A Tutorial]
  (http://www.cprogramming.com/tutorial/bitwise_operators.html)
  (on <http://cprogramming.com/>)

* [AVR Tutorials - \[TUT\] \[C\] Bit manipulation (AKA "Programming 101")]
  (http://www.avrfreaks.net/index.php?name=PNphpBB2&file=printview&t=37871&start=0)

* [In C++ is "const" after type ID acceptable?]
  (http://stackoverflow.com/questions/988069/in-c-is-const-after-type-id-acceptable)
  (on <http://stackoverflow.com/>)

* [Arrays and pointers in C]
  (http://www.ibiblio.org/pub/languages/fortran/append-c.html)
  (on <http://www.ibiblio.org/>)

* [how to use array of function pointers?]
  (http://stackoverflow.com/questions/252748/how-to-use-array-of-function-pointers)
  (on <http://stackoverflow.com/>)

* [The Function Pointer Tutorials]
  (http://www.newty.de/fpt/index.html)

* [C preprocessor and concatenation]
  (http://stackoverflow.com/questions/1489932/c-preprocessor-and-concatenation)
  (on <http://stackoverflow.com/>)

* [The New C: Inline Functions]
  (http://drdobbs.com/184401540)
  by Randy Meyers
  (on <http://drdobbs.com/>)

* [gcc: why the -lm flag is needed to link the math library?]
  (http://stackoverflow.com/questions/4606301/gcc-why-the-lm-flag-is-needed-to-link-the-math-library)
  (on <http://stackoverflow.com/>)

### For the AVR

* [AVR Newbie guide]
  (http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=70673)
  by stu_san (on <http://www.avrfreaks.net/>)

* [AVR Libc Library Reference]
  (http://www.nongnu.org/avr-libc/user-manual/modules.html)

* [avr-libc/include/avr/iom32u4.h]
  (http://svn.savannah.nongnu.org/viewvc/trunk/avr-libc/include/avr/iom32u4.h?revision=2288&root=avr-libc&view=markup)
  : list of registers and associated bit numbers for ATmega32U4

* [A Brief Tutorial on Programming the AVR without Arduino]
  (https://www.mainframe.cx/~ckuethe/avr-c-tutorial/)
  by Chris Kuethe

* [Optimisations of AVR programs using avr-gcc]
  (http://www.tty1.net/blog/2008-04-29-avr-gcc-optimisations_en.html)

* [Using the EEPROM memory in AVR-GCC]
  (http://www.avrfreaks.net/index.php?name=PNphpBB2&file=viewtopic&t=38417)
  : tutorial by [Dean Camera] (http://fourwalledcubicle.com/AboutMe.php)
  (on <http://www.avrfreaks.net/>)

    * updated version available as a pdf at
      [Four Walled Cubicle : AVR Articles]
      (http://www.fourwalledcubicle.com/AVRArticles.php), along with a few
      other good articles on AVR programming


## Protocol Stuff

### I&sup2;C

* [Arduino I&sup2;C Expansion IO]
  (http://www.neufeld.newton.ks.us/electronics/?p=241)
  (from [Keith's Electronics Blog]
  (http://www.neufeld.newton.ks.us/electronics/))

* [Arduino Playground :: Wire Library, Explored]
  (http://arduino.cc/playground/Main/WireLibraryDetailedReference)

### USB

* About Keyboard [Scan Codes]
  (http://geekhack.org/showwiki.php?title=Scan+Codes)
  (on <http://geekhack.org/>)

* [USB - boot mode, NKRO, compatibility, etc...]
  (http://geekhack.org/showthread.php?13162-USB-boot-mode-NKRO-compatibility-etc/page2)
  : old thread by [Soarer]
  (http://geekhack.org/member.php?4274-Soarer)
  (on <http://geekhack.org/>)

* [USB 2.0 Specification]
  (http://www.usb.org/developers/docs/usb_20_101111.zip)
  : zip (from <http://www.usb.org/developers/docs/>)

* [HID Device Class Definition]
  (http://www.usb.org/developers/devclass_docs/HID1_11.pdf)
  : pdf (from <http://www.usb.org/developers/hidpage>)
    * HID = Human Interface Device

* [HID Usage Tables]
  (http://www.usb.org/developers/devclass_docs/Hut1_12v2.pdf)
  : pdf (from <http://www.usb.org/developers/hidpage>)


## Other People's Code

### Keyboard Firmware

* zip: [Phantom Firmware from PrinsValium]
  (http://geekhack.org/attachment.php?attachmentid=38982&d=1327895092)

    * mentioned in the [Building Phantom Hardware and Firmware Mods]
      (http://geekhack.org/showwiki.php?title=Island:26742)
      article (on <http://geekhack.org/>)

* github: [tmk / tmk_keyboard]
  (https://github.com/tmk/tmk_keyboard)

    * forked by [Pyrolistical / tmk_keyboard]
      (https://github.com/Pyrolistical/tmk_keyboard/tree/master/fourway)

        * mentioned in the [KeyPoard]
          (http://geekhack.org/showwiki.php?title=Island:26845)
          article on <http://geekhack.org/>

    * forked by [riffautae / tmk_keyboard]
      (https://github.com/riffautae/tmk_keyboard)

        * mentioned on the [Teensy Keyboard Firmware Discussion]
          (http://geekhack.org/showthread.php?26730-Teensy-Keyboard-Firmware-Discussion/page2)
          thread on <http://geekhack.org/>

* github: [humblehacker / keyboard]
  (https://github.com/humblehacker/keyboard)

    * mentioned on [the humblehacker keyboard website]
      (http://humblehacker.com/keyboard/)

    * mentioned on [the humblehacker geekhack page]
      (http://geekhack.org/showwiki.php?title=Island:6292)

    * mentioned on [the designer's blog]
      (http://humblehacker.com/blog/)

### USB Libraries

* [LUFA (2012) (Lightweight USB Framework for AVRs)]
  (http://www.fourwalledcubicle.com/LUFA.php)

* zip: [PJRC: usb_keyboard]
  (http://pjrc.com/teensy/usb_keyboard.zip)

    * mentioned on [the PJRC website]
      (http://pjrc.com/teensy/usb_keyboard.html)

### TWI Libraries

* github: [TWI library in C]
  (https://github.com/arduino/Arduino/tree/master/libraries/Wire/utility)
  : (arduino / Arduino / libraries / Wire / utility)

* zip: [i2cmaster]
  (http://homepage.hispeed.ch/peterfleury/i2cmaster.zip)
  (by Peter Fleury, on [his homepage]
  (http://homepage.hispeed.ch/peterfleury/))

* forum: [Interfacing MCP23018 io expander via Arduino]
  (http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1282150189)
  : contains a quick MCP23017 library in C++

* github: [maniacbug / Arduino / libraries / MCP23018]
  (https://github.com/maniacbug/Arduino/tree/master/libraries/MCP23018)
  : library in C++

### Other

* [Soarer's Converter (XT/AT/PS2/Terminal to USB Converter with NKRO)]
  (http://geekhack.org/showwiki.php?title=Island:17458)

* zip: [PJRC: blinky]
  (http://pjrc.com/teensy/blinky.zip)

    * mentioned on [the PJRC website]
      (http://pjrc.com/teensy/gcc.html)


## Hardware Documentation

* [Microchip: Analog & Interface Product Selector Guide]
  (http://ww1.microchip.com/downloads/en/DeviceDoc/21060z.pdf)

    * from [the Microchip website (MCP23017 product listing page)]
      (http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en023499)

* [MCP23017 / MCP23S17 Data Sheet]
  (http://ww1.microchip.com/downloads/en/DeviceDoc/21952b.pdf)

    * from [the Microchip website]
      (http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en023499)

* [MCP23018 / MCP23S18 Data Sheet]
  (http://ww1.microchip.com/downloads/en/DeviceDoc/22103a.pdf)

    * from [the Microchip website]
      (http://www.microchip.com/wwwproducts/Devices.aspx?dDocName=en537375)

* [Teensy 2.0 (ATMEGA32U4) Data Sheet]
  (http://pjrc.com/teensy/atmega32u4.pdf)

    * from [the PJRC website]
      (http://pjrc.com/teensy/datasheets.html)

* [Teensy++ 2.0 (AT90USB1286) Data Sheet]
  (http://pjrc.com/teensy/at90usb1286.pdf)

    * from [the PJRC website]
      (http://pjrc.com/teensy/datasheets.html)

* [Teensy 2.0 Pin Assignments, Using C]
  (http://pjrc.com/teensy/card2a.pdf)

    * from [the PJRC website]
      (http://pjrc.com/teensy/datasheets.html)

* [Teensy 2.0 Pin Assignments, Using Arduino]
  (http://pjrc.com/teensy/card2b.pdf)

    * from [the PJRC website]
      (http://pjrc.com/teensy/datasheets.html)

* [Cherry MX Series Keyswitches : Specifications]
  (http://www.cherrycorp.com/english/switches/key/mx.htm)


## Miscellaneous

### Typical Keyboard Information

* [Keyboard Scan Rates]
  (http://geekhack.org/showwiki.php?title=Keyboard+scan+rates)
  list (on <http://geekhack.org/>)

### Other Awesome Keyboard Projects

* [My DIY keyboard collection ( or how I became a KB-geek...)]
  (http://deskthority.net/workshop-f7/my-diy-keyboard-collection-or-how-i-became-a-kb-geek-t2534.html)

    * linked to in [a post]
      (http://geekhack.org/showthread.php?22780-Interest-Check-Custom-split-ergo-keyboard&p=582593&viewfull=1#post582593)
      on the ergoDOX geekhack thread

### Documentation and Design Tools

* [Markdown: Syntax]
  (http://daringfireball.net/projects/markdown/syntax)

* [KiCAD Tutorial]
  (http://teholabs.com/knowledge/kicad.html)
  (on <http://teholabs.com/>)

    * mentioned on the [circuit/block-diagram drawing]
      (http://stackoverflow.com/questions/6422603/circuit-block-diagram-drawing)
      question (on <http://stackoverflow.com/>)

* [Ti<i>k</i>Z and PGF]
  (http://www.texample.net/tikz/)
  : a TeX graphics package

    * mentioned on the [circuit/block-diagram drawing]
      (http://stackoverflow.com/questions/6422603/circuit-block-diagram-drawing)
      question (on <http://stackoverflow.com/>)

    * [Documentation (for version 2010-09-28)]
      (http://www.texample.net/media/pgf/builds/pgfmanualCVS2010-09-28.pdf)
      : pdf

    * [Example: Block diagram line junctions]
      (http://www.texample.net/tikz/examples/line-junctions/)

* [Inkscape : Connector tool tutorial]
  (http://wiki.inkscape.org/wiki/index.php/UsingTheConnectorTool)


-------------------------------------------------------------------------------

Copyright &copy; 2012 Ben Blazak <benblazak.dev@gmail.com>  
Released under The MIT License (MIT) (see "license.md")  
Project located at <https://github.com/benblazak/ergodox-firmware>