Arduino Hacking Extending and Developing

Arduino is designed to be easily extensible, being based on standard and powerful components. This section of the site includes information on how Arduino works and ways you can extend it. 

Software

• Writing a Library: creating libraries to extend the functionality of Arduino. Goes step-by-step through the process of making a library from a sketch. 

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• Preferences: the Arduino preferences file contains many options for customizing the way Arduino compiles and upload sketches.
• Build Process: find out what steps your sketch goes through on its way to the Arduino board.
• Bootloader: the bootloader is a small piece of software that allows uploading of sketches onto the Arduino board. It comes preprogrammed on the microcontrollers on Arduino boards. Additional instructions on bootloading the Mini are available.
• Programmer: how to use the Arduino software with an hardware programmer (eliminating the need for the bootloader and saving program space on the chip).
• Upgrading 8U2 Firmware upgrading the firmware of the Atmega8U2 chip on an Uno or Mega2560. This chip acts as the usb-to-serial converter and can be updated via USB.
• Upgrading the WiFi Shield firmware: The ATmega32UC3A1256 take care of implement the TCP/IP stack and talk with the HDG104 WiFi module. Upgrading the firmware could improve or change the behavior of the shield.
• Source: online browsing of the Arduino source code (on an external website)
• Bugs: the current list of Arduino software bugs and planned enhancements (on an external website). Suggestions and bugs may be posted locally here. More detailed discussion of bugs can be found in the forum. Hardware Bugs, Software Bugs 

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Hardware

• Pin Mapping (ATmega8, ATmega168): a diagram showing the correspondence between the pins on an Arduino board and those of the ATmega8 or ATmega168 microcontroller.
• NG Auto Reset: how to modify your Arduino NG so you can upload sketches with having to physically press the reset button on the board.
• Parallel Programmer: instructions for making a cheap piece of hardware that lets you burn the bootloader to an Arduino board or upload sketches to a board with no bootloader (only works on computers with a parallel port).
• Breadboard Circuit: instructions for replicating the circuit of an Arduino board on a breadboard.