Arduino Playground - TutorialList

Listing of all Arduino Tutorials

LadyAda's Arduino Tutorials: covers the fundamental things you can do with Arduino. Very detailed, with lots of pictures and videos.
'tronixstuff Detailed series of tutorials (50+ chapters and growing!) covering topics for beginners to advanced users, go from blinking an LED to advanced wireless and cellular communication
EarthShine Electronics - The Complete Beginners Guide to the Arduino
Sheepdog's Guide to Arduino Programming - About 35,000 words spread over 17 chapters. Mostly about programming.
Blinkenlight Experiments Detailed series of experiments build around blinking 20 LEDs

Let the arduino sleep.
Hush little microcontroller - Sleep basics: An alternative overview of sleep with considerations for both Arduino and AVRs
C language
- A very good summary of the C language (.pdf)
- Reference for the standard C API (libc).
  To use with Arduino, add the appropriate #include to the top of your sketch and use the functions as documented in the manual.
- Variable Scope - An explanation of scope (or variable visibility) in an arduino sketch.
Port Manipulation - How to access digital pins directly
Programming Arduino Uno in pure C
Useful AVR commands for getting the job done

OneWire Interface (Dallas Semiconductor) - Tutorial on OneWire in general and some hardware

HowTo use protothreads Tutorial for the protothread library with an arduino, includes an examples. Download the zip file, see post bottom for link.
How and Why to avoid delay and use millis() timers instead - an example driven explanation. Serves also as an introduction to doing several things at once.
Timing Rollover, how to handle it, and some simple code examples.
uCHobby Arduino Interrupts - comprehensive explanation of the use of Timers.

Charlieplexing
This section needs to be extended | see Input / Output from the Code Snippets and Utility Libraries section for ideas and example code.
Creating a Web Activity Monitor using Arduino & 8x8 LED Matrix Tutorial
Human Interface: build a simple, clean, cheap and efficient human interface using a rotary encoder and a LCD display
PWM: tutorial and code description for setting any pin as a PWM output at any frequency
EngBlaze - Arduino Interrupts: How to use external interrupts to efficiently handle input events
Blinkenlight experiments to make 20 LEDs blink. Experiments ranging from beginner to advanced. Always using 20 LEDs.
PID: The most popular process control explained and exemplified through a heating system application.

Tricks for using the hidden EEPROM and Flash memory
Counting Resets in EEProm - A Blinkenlight experiment outlining EEProm wear leveling.
Tutorial with examples on writing/reading EEPROM using the EEPROMex library. The tutorial covers reading, writing and updating bytes, longs, ints, floats and doubles, single bits, structs, arrays and more.
Using read-only Flash ("PROGMEM") storage - top secret information too shocking to be included in the official reference section
Expand your RAM to 32KB: it is small, affordable and sooooo comfortable
Tips on optimizing memory usage - Running out of memory?
SD Cards: All you need to know for adding a SD card to your prokect (e.g. data logger)

Trackuino - An open-source APRS tracker based on Arduino. It contains reusable code for FSK modulation, PWM wave generation, GPS NMEA parsing and AX.25 packet generation.
arduiNode - arduinode is a protocol for a wireless sensor network (WSN). Communication is handled in the background, neighbor nodes find each others and span the net. Some of its core features are: multi hop packet routing, dynamic id allocation, collision avoidance and rebroadcasting of lost messages.
nRF24L01+ - Getting started with nRF24L01+ 2.4GHz RF radios on Arduino, including wiring them up and communicating. Also included, a tutorial on using Sparkfun's Nordic FOB with the RF24 library.
RF24Network - Building a Wireless Sensor Network on Arduino using nRF24L01+ radios.
Sensormonkey - A video screencast illustrating how to connect an Arduino to the high speed sensor streaming web service Sensormonkey.
Serial comm ports for ever, and ever, and ever...
Controlling Processing sketches, with a simple tutorial...

Articles on understanding and decoding the DCF77 radio signal into a valid atomic clock synchronized time using the DCF77 library. The articles cover DCF77 Hardware, the DCF77 Signal and finally the DCF Library.

http://amigojapan.github.com/Arduino-Retro-Computer-TV/ Arduino Retro Computer TV- How to build a computer using 2 Arduinos, an SD card reader, a TV, and a PS2keyboard. This computer can execute BASIC programs. This is like a C64 or Sinclair.
http://amigojapan.github.com/Arduino-Retro-Computer-with-SD-card-and-LCD-display-and-Keyboard-input-with-BASIC-interpreter/ Arduino Retro Computer LCD- How to build a computer using an Arduino, an SD card reader, an LCD screen and a PS2keyboard. This computer can execute BASIC programs. This is like a TSR-80 and is portable.
Behavior based programs: A framework and tutorial for describing control logic as Behavior classes.
Creating and Using Libraries
How to extend libraries using Hierarchy
How to write Hardware Abstraction libraries
Questions about Pointers? See this chapter from Practical C Programming.
Tips and Tricks: A collection of tips and tricks

Bit Math Tutorial
Learn how to decipher all those cryptic formulas you see in C code that use symbols like &= and <<. Start using bitwise operators in your own code to save memory and perform sophisticated low-level operations on your microcontroller hardware.
FFT tutorial: Learn how to implement Fast Fourier Transform in Arduino
FIR filters tutorial: Learn how to implement FIR (Finite Impulse Response) filters in Arduino
Compensating for differences between pulseIn and FreqCounter measurements - A tutorial on compensating for the inaccuracy of software-implemented frequency measurement

Capacitance meter: DIY Arduino based capacitance meter.
Fast signal sampling: Running analog to digital conversion in fast mode.
Shutter speed: Determining the shutter speed of a (digital) camera.
Supply Voltage Measurement: Determine the supply voltage of an Arduino (after the regulator).

Memory-efficient decompression - LZ type data decompressor tutorial, using almost no additional RAM

Arduino on Ice - How to stream Internet Radio via Shoutcast & Icecast.
Sound capture: an introduction to sound capture and the way to use collected data. Micro Light show is one particular application of sound capture combined with FFT.

Counting as fast as possible - An example for agressive performance optimization. You may also want to read the afterthoughts here