... an evolving index of practical subjects for the Arduino^tm and Freeduino microcontrollers, as found in the Arduino site, Playground wiki, forum and that big WWW thing.

Last update: August 8th, 2008. Over 100,000 visitors served wihtout adverse side effects. To suggest a link,

Everything you read here will work on Arduino, the many versions of Freeduino, the Barebones and RBBB, the Boarduino, the iDuino and MAXserial, and of course the new-kid-on-the-block-big-daddy Sanguino. Because of the different hardware layouts of these boards, slight modifications will occasionally be required between physical
platforms.

**Brian Evans shows hhis genius and generosity with the Arduino Programming Notebook. You can get a printed copy for only $5.33 at Lulu, or save paper and download the PDF instead for FREE!

**Woot-- Freeduino now available in India! Check out the Freeduino serial at Bhasha technologies.

Use the "find' function of your browser to search the index.
(if you want to be a star, write some search code for us.)

A

• ACCELEROMETER: tutorial on using the Memsic 2125 accelerometer with Arduino/Freeduino
• ACCELEROMETER: another post on using the Memsic 2125 Rad*o Sha*k variant accelerometer with Arduino/Freeduino
• ACCELEROMETER: article on using the LIS3LV02DQ 3-axis accelerometer with Arduino/Freeduino
• ACCELEROMETER: an excellent article on using the ADXL330 with Amtega processors
• ACCELEROMETER: Hack the ADXL330 accelerometer used in a Wii "nunchcuck".
  
  
• ADAPTER, DC: correct DC Adapter type to use for Arduino or Freeduino
  
  
• A/D converters: code for interfacing Arduino/Freeduino with a Dallas DS2450 quad A/d chip
  
  
• ANALOG TO FREQUENCY: code and patch to turn Arduino/Freeduino serial data into a frequency in MAX.
  
  
• ANALOG GAUGE: Make one with Arduino/Freeduino
  

• APPLESCRIPT: blog post on how to use Arduino/Freeduino and Applescript to control your MAC
  
  
• ARDUINO2MAX: a copyleft software package for interfacing Arduino/Freeduino's input pins to MAX/MSP
  
  
• Arduino API: reference
  
  
• Arduino BLOG: the Arduino team announces things related to the official Arduino^tm products.
  

• Arduino BT: main page
  
• Arduino BT: Burning the bootloader on the Arduino BT: with AVR-ISP
• Arduino BT: set-up for Mac OS X Tiger: tutorial
• Arduino BT: set-up for Windows XP: tutorial
• Arduino BT: change the security code and name of the module:tutorial
  
  
• Arduino BOOKLET: the ultimate guide to Arduino, and it's free!
  
  
• Arduino BUILD PROCESS: see this page
  
  
• Arduino COMMAND REFERENCE: this page
  
  
• Arduino Single-sided DIY board- aka the "Severino"
  

• Arduino STANDALONE: PCB's for building standalone Freeduino's
• Arduino STANDALONE: another PCB supplier for making runtime versions of the Arduino/Freeduino
  
  
• Arduino CLONE: Adafruit's slim-line narrow-gauge BoArduino
  
• Arduino CLONE: uDUINO, Super--minimalist Arduino/Freeduino clone
• Arduino CLONE: iDuino, a very nice USB board for prototyping on a breadboard
• Arduino CLONE: protoDuino, the breakaway PCB
• Arduino CLONE: stickDuino
  
  
• Arduino DIECIMILIA: description

• Arduino GETS TIRED: how to program sleep mode for your Arduino/Freeduino
  
  
• Arduino DISTRIBUTORS: list
  
  
• Arduino HARDWARE VERSIONS: see this page
  
• Arduino IDE: latest release
• Arduino IDE PREFERENCES: see this page
  
• Arduino LILYPAD: main description
• Arduino LILYPAD: buy it at Sparkfun
• Arduino LILYPAD: getting started guide
  
• Arduino MINI:general info page in the Playground
• Arduino MINI: tutorial on how to program with an Arduino NG
  
  
• Arduino NG: introduction
  
  
• Arduino NG: startup problems on external power
• Arduino NG: current output specs
  
  
• Arduino PROGRAMMING NOTEBOOK: an excellent intro to Arduino programming, available printed-on-demand from Lulu for a paltry $5.33, or as a PDF for free. Another example of the amazing things the Arduino community makes possible...

• Arduino SHIELDS: main page
• Arduino SHIELDS: XBEE, see the Playground page
• Arduino SHIELDS: motor driver shield, see the Playground page
• Arduino SHIELDS: DIY Breadboard shield, see this page
• Arduino SHIELDS: prototyping shield by PCB Europe, see this page
• Arduino SHIELDS: prototyping and breadboard shield by Sparkfun, see this page
• Arduino SHIELDS: breakout shield: Arduino to terminal blocks
• Arduino SHIELDS: the 'Danger' tutorial shield

• Arduino SOFTWARE: latest release
  
  
• Arduino TRADEMARK AND LICENSING: See this very very very very very very very long forum thread for a community discussion of the tradmark and licensing issues associated with Arduino, and open-source hardware in general.
  

• Arduino WIKIPEDIA PAGE: here

• ARDUINO TUTORIALS: Ladyada's beginner's tutorials for Arduino
  
  
• ARDUPILOT: the world's cheapest UAV autopilot
  
  
• ARDUSTAT: open-source, inexpensive galvanostat/potentiostat module for Arduino/Freeduino

• AREF PIN: forum post on how to use the AREF pin
  
  
• ATMEGA8: pin mapping
• ATMEGA8L: forum post and Playground article
  
• ATMEGA168: pin mapping
  
  
• ATMEGA FUSE CALCULATOR: See this page

• AUDIO: Arduino/Freeduino an control the Viniculum VMusic2
  
  
• AVR: use the Arduino or Freeduino as an AVR programmer!

B

• BARCODE SCANNER: tutorial
  
  
• BAREBONES Arduino: by Modern Device Company
• BAREBONES Arduino: time-lapse assembly video
  
  
• BATTERY OPERATION: lead-acid battery
• BATTERY OPERATION: 9V adapter
• BATTERY OPERATION: use a single AAA battery to power Arduino
• BATTERY OPERATION: Instructable on using a niCad pack with a Boarduino
• BATTERY OPERATION: a slew of stats on running an Arduino and Xbee on batteries
  
  
• BEER: UcHobby post on how to make a beer thermostat. Who says Arduino/Freeduino isn't fun?
  
  
• BEGINNER'S BOOKS: suggested books on electronics for beginners
  
  
• BINARY CLOCK: blog post on how to make a Binary Clock with Arduino/Freeduino
  
  
• BIT MATH: tutorial
  

• BLINKING LED: tutorial
  
  
• BLUETOOTH: hack Bluetooth capability of the Wiimote to make Arduino or Freeduino wireless
  
  
• BOARDUINO: Ladyada's inexpensive and compact Arduino clone, avalaible at Adafruit.com
  
  
• BOOKLET: the free Arduino booklet!
  
  
• BOOTCLONER: copy the Arduino Bootloader
• BOOTLOADER: hex file for Atmega8: search for Arduino CVS & or Arduino Berlios
• BOOTLOADER: hex file for Atmega168: ditto
• BOOTLOADER: hex file for Arduino BT *BOOTLOADER: Burning the bootloader on the Arduino BT: tutorial
• BOOTLOADER: build a parallel programmer to burn the bootloader
• BOOTLOADER: burn with AVRISP MKII on Mac OSX
• BOOTLOADER: copy with "bootcloner"
• BOOTLOADER: use a handy script to burn it
• BOOTLOADER: blog post on burning it
• BOOTLOADER: the gold standard of bootloader programmer pages. If the New Yorker wrote tutorials, this would be wht they look like: "Arduino Bootloader: a Fistful of Programmers." Ok, we know that's exaggerating.
• BOOTLOADER: programmer for burning the adaboot
  
  
• BREADBOARD Arduino: tutorial
  
• BREADBOARD SHIELD: DIY, see this page
• BREADBOARD SHIELD: PCB Europe, see this page
  
  
• BUILD PROCESS: see this page
  
  
• BUTTON: read a button push tutorial
• BUTTON: read a button push, and send this data to a PC: tutorial
• BUTTON: read a button push, and treat as on/off signal tutorial

C

• C: to interface to C code, see this page
  
  
• CAD: Script to connect Rhino CAD to Arduino/Freeduino, and another post here
  
  
• CAMERA: control a Canon EOS 400 with Arduino or Freeduino
  
• CAMERA: forum post with camera control code
• CAMERA: pan-tilt code
• CAMERA: code and diagrams for making a flash trigger for cameras...
• CAMERA: blog post on how to catch lightning on your camera, using an Arduino
• CAMERA: blog posting and Eagle files for building a intervalometer/sound trigger for a camera
• CAMERA: yet another intervalometer based on Arduino/Freeduino, this time for your Canon camera
• CAMERA: catch a drop of liquid with this Arduino./Freeduino shutter trigger
• CAMERA: wow, there's alot of camera triggers out there for Arduino/Freeduino
  
  
• CAPACITIVE SENSING: forum post on using two Freeduino or Arduino pins for capacitive touch sensing
  
  
• CELL PHONE: talking to the Freeduino or Arduino BT from a Nokia cell via Python code
• CELL PHONE: Flashing an LED via cell phone and Applescript
• CELL PHONE: Cell phone SMS Library for Arduino/Freeduino
  

• CHAT SERVER: connect to a chat sever using Arduino
  
  
• CLOCK: derive the real time from a DCF77 radio clock
• CLOCK: It was about time that someone wrote a blog post on using the DS1306 SPI real-time clock with Arduino
• CLOCK: and a little later, someone wrote this poast about using the DS1307!
• CLOCK: blog post on how to make a Binary Clock with Arduino/Freeduino
  
  
  
• COLOUR FADER: code and MAX patch for fading leds on Freeduino or Arduino through MAX

• COMMAND LINE: programming Arduino from the command line
• COMMAND LINE: more command-line code for serial comms.
  
• COMMAND REFERENCE: this page
  
  
• COMPASS: forum post on using the HMC6532 compass chip
  
• COMPONENTS: on the Freeduino or Arduino board
  
  
• CONWAY'S GAME OF LIFE: make one with Arduino/Freeduino
  
  
• COURSEWARE: Arduino courseware project

D

• DAC: Proto-DAC, a digital to analog shield for the Arduino
  
  
• DALLAS 1-WIRE PROTOCOL: forum post interfacing to a Dallas 1-wire temp sensor; code
• DALLAS TEMPERATURE SENSORS: tutorial and code for interfacing with the 18B20 temp sensor to the Freeduino or Arduino. See also the "TEMPERATURE" heading below.
• DALLAS A/D: code for interfacing Freeduino or Arduino with a Dallas DS2450 quad A/d chip
  
  
• DATAFLASH: An Uber-cool library that lets your Freeduino or Arduino talk to an external flash memory chip. This is great tool for things like building a datalogger, or just storing data in general. Here's the code.
  
  
• DATALOGGER: Wulfden.org's cool Datalogger with real-time clock and serial eeprom
  
  
• DC ADAPTER: what DC adapter to use with Freeduino or Arduino
  
  
• DC POWER: withl lead-acid battery
• DC POWER: with 9V battery adapter
  
  
• DEVANTECH ULTRASONIC RANGER: tutorial 
• DEVANTECH ULTRASONIC SENSORS: tutorial on using the Devantec SRF04 and SRF05 modules with Arduino or Freeduino
  
  
• DIGITAL INPUT AND OUTPUT: tutorial
  
  
• DIGITAL TO ANALOG: Proto-DAC, a digital to analog sheild for the Arduino
  
  
• DIMMING 3 LED'S: tutorial
  
• DIMMING AC LIGHTS: with dimmer pack, forum post
  
  
• DIRECT DIGITAL SYNTHESIS: Control the AD9851 DDS chip with Arduino/Freeduino
  
  
• DIRECTOR: to interface to Macromedi* Director, see the Playground page
  
  
• DISTANCE SENSOR: sense distance with a PING ultrasonic sensor and  Arduino/Freeduino
• DISTANCE SENSOR: tutorial on interfacing a PING ultrasonic distance sensor
• DISTANCE SENSOR: tutorial on using a Devantec ultrasonic ranger module with Arduino or Freeduino
• DISTANCE SENSOR: tutorial on using the Devantec SRF04 and SRF05 modules
• DISTANCE SENSOR: tutorial on using the Sharp GP2D120 infrared ranging sensor
• DISTANCE SENSOR: code for the Maxbotix ultrasonic distance sensor (sonar), from a forum post
• 
  
  
• DIY BREADBOARD SHIELD: see this page

• DMX: how it works
  
• DMX: tutorial on making Arduino or Freeduino into an OPENDMX interface
• DMX: tutorial on making an Arduino or Freeduino DMX shield
  
  
• DRUMS: the amazing Ardrumo: code and software for a drum kit!
• DUINOSTAMP: minimalist Arduino clone, or but it here

E

• EDGE DETECTION: code
  
  
• EEPROM: tricks for using the hidden EEPROM in the Freeduino or Arduino
• EEPROM: tutorial on interfacing Freeduino/ Arduino with a serial EEPROM using SPI
• EEPROM: blog post on using the 25LC080 EEprom
  
  
• ELECTRONICS: suggested books for beginners
• ELECTRONICS: other resources for beginners
  
• ELECTRONICS: circuit reference from the Wiring site
  
  
• ETHERNET: Ladyada's ethernet shield
  
  
• EVENT TIMER: code and a blog post
  
  
• EXPANDING DIGITAL INPUTS: using the 74XX151
• EXPANDING DIGITAL INPUTS: using the CD4021 with Arduino/Freeduino
  
  
• EXPANDING ANALOG INPUTS: using the MC14067
  
  
• EXPANDING DIGITAL OUTPUTS: use the Phil*ps 4794 shift register to multiply outputs
• EXPANDING DIGITAL OUTPUTS: tutorial on multiplying digital outputs using a 74HC595 shift register
  
  
• EXPANDING PWM OUTPUTS: tutorial on using the TLC5940 to multiplex PWM outputs

F

• FAN: read the RPM of a fan controlled by Freeduino/Arduino
  
  
• FIRMATA: firmware for using the Freeduino/Arduino as a sensor box in PD, VVVV, Flash, Python, MAX, Processing...
  
  
• FLASH: send data to Macromedi* Flash from Arduino: see the Playground page
  
  
• FLASH TRIGGER: for cameras...
  
  
• FLASHING LED: tutorial
• FLASHING LED's in sequence: tutorial
• FLEXI: an Arduino-based prototyping environment called "FLEXI".
  
  
• FREEDUINO: Total anarchy, aka Open design files for an Arduino-compatible board.
  
  
• Freeduino board: Barebones Arduino by Modern Device
• Arduino board: Arduino/Freeduino Runtime by NKC Electronics
• FUNCTIONS: forum post on how to write one

G

• GALVANOSTAT: open-source, inexpensive galvanostat/potentiostat module for Arduino/Freeduino

• GPS: code for parsing data from EM-406 GPS module
• GPS: interface Freeduino/Arduino to a Paralla* GPS module: tutorial
• GPS: forum thread on building a GPS navigation unit with Arduino/Freeduino
• GPS: the inimitable Ladyada's GPS Data logger shield.
• GPS: code for an Arduino-Freeduino based GPS tracker/logger that logs GPS position information to the Arduino's on-board EEPROM

H

• HACKING Arduino/Freeduino: a set of pages on hacking the Arduino code and hardware
  
  
• HALL EFFECT SENSORS: as in magnetic sensing, not hallways. Forum thread is here.
  
  
• HELLO WORLD: the first step in Arduino/Freeduino programming

• HMC6532: forum post on using the HMC6532 compass chip
  
  
• HTML: how to control an Freeduino or Arduino remotely with HTML form
  
  
• HUMIDITY SENSOR: Blog post and code on how to connect an SHT-15 to Arduino/Freeduino

I

• I2C:
  

• IDE: Arduino/Freeduino IDE
  
• IDE PREFERENCES: see this page
  
  
• iDuino: a cool standalone board for prototyping!
  
  
• INFRARED MOTION SENSOR: code for using the Paralla* IR motion sensor
• INFRARED MODULES: using standard infrared receiver modules with Arduino/Freeduino
• INFRARED MODULES: how to use standard Panasonic IR modules with Arduino/Freeduino
  
  
• INFRARED REMOTE CODE: IR Remote code for Arduino or Freeduino
  
  
• INTERRUPTS: article on how to use interrupts with Arduino/Freeduino
• INTERUPTS: an excellent article by UCHobby on how to use intterupts with Arduino/Freeduino
  
  
• INTERVALOMETER: ultra-cool page on how to build an ultra-cool photographer's helper gizmo. This an incredibly detailed article and a generous gift to the community, to which we award our two gold stars, our highest honour: . This is a terrific piece of work: check out the USER MANUAL! Sets the standard.
• INTERVALOMETER: blog posting and Eagle files for building a intervalometer/sound trigger for a camera
• INTERVALOMETER: yet another intervalometer based on Arduino/Freeduino, this time for your Canon camera
• 
  
  
• IPOD: control an ipod with optoisolators
• IPOD: serial code for remote control by Arduino/Freeduino
• IPOD: even more serial IPOD code for Freeduino/Arduino

J

• JOYSTICK: tutorial on how to interface a joystick to Arduino/Freeduino

K

• KEYPAD: tutorial on using matirx keypads
  
  
• KNOCK SENSOR: Arduino or Freeduino tutorial on sensing a knock at the door, or table, or wall...
  

L

• L293: tutorial on driving a DC motor with an L293 motor driver chip
• L297: forum post on using the L297 motor driver chip
  
• LABVIEW: what is that anyway? Find out int his blog post.
  
  
• LCD: tutorial on the LCD library
• LCD: interface to an 8-bit LCD display with Arduino/Freeduino
• LCD: tutorial on using a serial LCD with the Arduino/Freeduino
• LCD: tutorial on the LCD library
• LCD: forum post on using the Nokia 3130 graphical LCD with the Arduino/Freeduino 
• LCD: interfacing the Arduino/Freeduino to the Noki* S1D15G10 graphic display
• LCD: tutorial on making a 3-wire LCD interface
• LCD: detailed article on the ins and outs of LCD interfacing to Arduino/Freeduino
• LCD: library for the HD44780
  
  
• LED: blinking a single LED on pin 13 tutorial
• LED: driving a series of LED's with a 74HC595: tutorial
• LED: using a transistor to drive more than one LED from a single pin: schematic
• LED: dimming 3 LED'S: tutorial
• LED: flashing LED's in sequence: tutorial
• LED: shooting star tutorial
• LED: tutorial on doing 3-colour corss-fades with a potentiometer
• LED: tutorial for a LED colour mixer with three potenitometers
• LED: use the Phil*ps 4794 shift register to multiplex 8 LED's connected to Arduino/Freeduino
  
  
• LED CUBE: blog post with code and video
  
  
• LED FADER: 32 LED fader with Arduino
  
  
• LED MATRIX: forum post1 on using the MAX7219 chip to drive an 8*8 array of LED's, and forum post 2 on daisy-chaining multiple MAX7219's
• LED MATRIX: code for driving multiple leds with the M5450 chip from Freeduino or Arduino
• LED MATRIX: code for using the Sparkfun RGB Matrix LED "backpack" with the Arduino/Freeduino
• LED MATRIX: Experimental library for using the MAX7219 and MAX7221 LED matrix driver chips
• LED MATRIX: using the STP16C596 16-bit Constant Current LED Sink Driver
• LED MATRIX: Multiplexing the MAX72xxx to drive a two-color matrix
  
  
• LED PEGBOARD: the 'PEGGY 2.0" Arduino-comaptible led baord, by those ultra-coll folks over at Evil Mad Scientist Labs
  
  
• LEVEL CONVERSION: how to convert a 12V signal to 5V for the Arduino/Freeduino's inputs.
  
  
• LIBERLAB: Add a lab coat to Arduino, become a scientist! Open-source lab platform.
  
  
• LIBRARIES: main page
  
  
• LIBRARY, EXPERIMENTAL: matrix keypad: tutorial
• LIBRARY, EXPERIMENTAL:  Servo library for up to 8 servos
  
• LIBRARY, EXPERIMENTAL: Servo on pins 9 & 10 only
• LIBRARY, EXPERIMENTAL: for the MAX7219 or MAX7211 LED matrix driver chips
• LIBRARY, EXPERIMENTAL: LCD: library for the HD44780
• LIBRARY, EXPERIMENTAL: Cell phone SMS Library for Arduino/Freeduino
  
  
• LIBRARY, STANDARD: LED matrix
• LIBRARY, STANDARD: text string
• LIBRARY, STANDARD: SoftwareSerial
• LIBRARY, STANDARD: 4-bit LCD
• LIBRARY, STANDARD: Metro, for timing
  

• LIBRARY, FROM WIRING: servo     (*  may require modifications for use with Arduino/Freeduino *)
  
• LIBRARY, FROM WIRING: encoder  (* may require modifications for use with Arduino/Freeduino *)
• LIBRARY, FROM WIRING: Qslide touch sensor library (*  may require modifications for use with Arduino/Freeduino *)
• 
  
• LIGHT SENSOR: forum post on connecting 3-pin type 
• LIGHT SENSOR: blog post on using Arduino/Freeduino and light sensor to control Processsing
• LIGHT SENSOR: French forum post on how to use an LED as a light sensor; english version
  
• LIGHT SENSOR: blog post on using Arduino/Freeduino and light sensor to control Processsing
  
  
• LIGHTNING: blog post on how to catch lightning on your camera, using an Arduino
  
  
• LINUX: Arduino/Freeduino on Linux
• LINUX: Arduino/Freeduino on Debian Linux
• LINUX: Arduino/Freeduino on FreeBSD
• LINUX: Arduino/Freeduino on Gentoo Linux
• LINUX: Arduino/Freeduino on Red Hat Linux
• LINUX: Arduino/Freeduino on Ubuntu Linux
• LINUX: Arduino/Freeduino on Mandriva
• LINUX: Arudino/Freeduino on SUSE 64 bit
• LINUX: blog post on using Arduino/Freeduino on old powerbook with Ubuntu PPC.
  
  
• LINUX TTY: to interface to Linux TTY, see this page
  
  
• LOW POWER: how to put the Arduino to sleep to save power
• LOW POWER: forum post and Playground article on using the Aega8L (low power AEGA8)
  

M

• MATH: bit math tutorial
• MATH: tutorial on Scaling integers
• MATH: todbot explains how to do big strings in Arduino. OK, we realize this is not really math.
  
  
• MATRIX KEYPAD: tutorial
  

• MAX7219: forum post1: using the MAX7219 chip to drive an 8*8 array of LED's; post 2: daisy-chaining multiple chips 

• MAX/MSP/JITTER: see the Playground page
  
  
• MEMORY: SD card reads and writes with Arduino/Freeduino
• MEMORY: See also the SD CARD heading
  
  
• MIDI: yes, it's a Midi-controlled SEGA master system sound chip...
• MIDI: how to deal with Midi Clock signals in Arduino
• MIDI: blog post on how to convert MIDI clock to Sync 24
• MIDI: this guy seems to be a master of Arduino <> Midi research: many good posts
  
  
• MIDI IN: Arduino/Freeduino forum member 'kuk' solves the age-old probelm of how to get midi in on the Arduino/Freeduino
• MIDI IN: turn the data from eight pots into Midi
• MIDI IN: control four digital pots through Arduino via MIDI
  
  
• MIDI OUT: tutorial on sending midi from an Arduino or Freeduino
• MIDI OUT: read a piezo and send midi notes tutorial
• MIDI OUT : midi player code
  
• MIDI OUT: the amazing Ardrumo: code and software for a drum kit!
• MIDI OUT: a midi pedal for Arduino/Freeduino
  
  
• MMC: what is that anyway? Inquiring minds want to know.
  
  
• MONOMUINO: Monome + Arduino == Monomuino
  
• MONOMUINO: more info here on work towards a Monome/Arduino shield
  
  
• MOTION SENSOR: code for using the Paralla* IR motion sensor
  
  
• MOTORS:tutorial on driving a DC motor with an L293 motor driver chip
• MOTORS:tutorial on driving a unipolar stepper motor
• MOTORS: forum post on using Arduino/Freeduino and an L297 motor driver chip to drive a motor in two directions
• MOTORS: ladyada's motorshield
• 
  
  
• MOUSE: interface to an optical mouse
  
• MOUSE: interfacing to a PS/2 mouse
  
  
• MP3: Arduino controls the Vinicul*m VMusic2
• MP3: control MP3's with the YAMP III and Arduino
  
  MULTIPLEXING DIGITAL INPUTS: using the 74XX151
• MULTIPLEXING DIGITAL INPUTS: using the CD4021
  
  
• MULTIPLEXING DIGITAL OUTPUTS: use the Phil*ps 4794 shift register to multiply outputs
• MULTIPLEXING DIGITAL OUTPUTS: tutorial on multiplying digital outputs using a 74HC595 shift register
  
  
• MULTIPLEXING LED'S: Multiplexing the MAX72xxx to drive a two-color matrix
  
  
• MULTIPLEXING ANALOG INPUTS: using the MC14067
  
• MULTIPLEXING PWM OUTPUTS: tutorial on using the TLC5940 to multiplex PWM outputs
  
  
• MUSIC: play melodies through a piezo speaker connected to Arduino
• MUSIC: play musical algorithms through a speaker connected to Arduino
• MUSIC: Narbotic's Arduino syntheiszer
• MUSIC: forum discussion on how to generate control voltages for synths
• MUSIC: UCHobby's article on how to make sound with the Arduino
• MUSIC: the amazing Ardrumo: code and software for a drum kit!
  
• MUSIC: Barebones-based hardware/software synthesizer
• MUSIC: diagram and video describing an Arduino Punk Console
• MUSIC: Control the AD9851 DDS synthesizer chip with Arduino/Freeduino

N

• NES: Use an old NES Controller as an input device for Freeduino / Arduino
  
  
• NOKIA LCD: forum post on interfacing to the Arduino to the Noki* S1D15G10 graphic display
  
  
• NONEXISTENT: there do not seem to be alot of Arduino/Freeduino topics that begin with the letter "N"
  

O

• OLED: Use Oled's with Arduino (in Spanish)
  
  
• ONE-WIRE: forum post interfacing to a Dallas 1-wire temperature sensor
  
  
• OPEN SOURCE: the reference designs for Arduino are  open-source, under a Creative Commons license
  
  
• OPENDMX: tutorial on making Arduino into an OPENDMX interface
  

• OPENWRT: hotplug script for OpenWRT

• OPPORTUNISTIC PROTOTYPING: see the free Arduino booklet!
  
  
• OPTICAL MOUSE: interface to an optical mouse
  
  
• OPTOISOLATORS: interface Freeduino/Arduino to an ipod using optoisolators
  
  
• OSCILLOSCOPE: An Arduino-based scope! (In Spanish)
• OSCILLOSCOPE: the poor man's ocscilloscope, made using Arduino & Processing
  

P

• PARTICLE DISPLAY: blog post on making particle displays with leds
  
  
• PCM AUDIO: do 80hz-8Khz PCM audio on Arduino or Freeduino
  
  
• PD: to interface to PD, see the Playground page.
  

• PDUINO: Arduino code for easy interface to PD... get it here

• PEAK: code to find a peak value over time
  

• PERL: interface from Perl to an Arduino driving an LCD
• PERL: script to talk to Arduino from LINUX
  
  
• PERFBOARD: Build your own Arduino/Freeduino on a perfboard
  

• PERSISTENCE OF VISION: how-to blog post
• PERSISTENCE OF VISION: Another blog discussing a POV project
• PERSISTENCE OF VISION: ... And another blog post on a POV Project, with code and pictures
• PERSISTENCE OF VISION: Wireless POV! In Spanish. (and part 2 of the same article.)
  
  
• PHIDGETS: shield for use with Phidget sensors
  
  
• PHOTOCELL:  forum post on connecting 3-pin type photocell to Arduino/Freeduino
  
  
• PHOTOGRAPHY: ultra-cool page on how to build an multi-purpose intervalometer/remote trigger gizmo.
  
  
• PHP: controlling Arduino over USB via PHP. Whew, that was a lot of acronyms.
• PHP: how to connect Arduino/Freeduino and XPORT using PHP
• PHP: connect to Arduion via the PHP Plushie Message Framework. Seriously.
• PHP: Arduino forum post on using PHP with Arduino
  
  
• PHYSICAL PIXEL CONTROL: code to control leds from MAX
  
  
• PING: tutorial on using the PING ultrasonic distance sensor
• PONG: do something useful with your Arduino. (sorry, we couldn't resist putting these two together)
  ;
  
• PIEZO: read a piezo knock sensor tutorial
• PIEZO: play melodies through a piezo speaker
  
  
• PLAY: tones from a keyboard through the serial port to Arduino tutorial
• PLAY: tones through a piezo speaker
  
  
• PLAYGROUND: the Arduino user's wiki
  
  
• PONG: do something useful with your Arduino.
  
  
• POTENTIOMETER: tutorial on how to read a potentiomenter
• POTENTIOMETER: tutorial on how to control a digital potentiometer using SPI
  
  
• POTENTIOSTAT: open-source, inexpensive galvanostat/potentiostat module for Arduino
  
  
• PRESSURE SENSORS: tutorialon using conductive foam as a sensor
• PRESSURE SENSORS: a nice blog post on connecting Freescale pressure sensors
  
  
• PROCESSING: to interface Arduino to Processing, check the Playground page
• PROCESSING: Arduino meets Processing web site
• PROCESSING: blog post on using Arduino and light sensor to control Processsing
• PROCESSING: an open-source image creation/control software
  
  
• PROGRAMMERS: using an external programmer to burn sketches
  
  
• PROGRAMMING ENVIRONMENT: intro to the Arduino Programming Environment
  
  
• PROTO-DAC: a DAC(digital to analog) shield
  
  
• PROTOTYPING BOARDS: Ptoroshield by PCB Europe, see this page
• PROTOTYPING BAORDS: Eagle files for making your own Protoshield
  
  
• PROXIMITY (human) SENSOR: code for using the Paralla* or HVWTec* IR motion sensor
  
  
• PURE DATA: to interface to PD, see the Playground page.
  
  
• PWM: see this link to add up to 16 PWM outputs to Arduino
• PWM: PWM all the digital pins in a sinewave pattern
• PWM: run PWM on all pins. Seat belt not included.
  
  
• PWM AUDIO: UCHobby blog post about PWM audio for Arduino/ Freeduino
  
  
• PUSHBUTTON: read a button push tutorial
• PUSHBUTTON: read a button push, and send this data to a PC: tutorial
• PUSHBUTTON: read a button push, and treat as on/off signal tutorial
  
  
• PYTHON: talk to Arduino with Python
• PYTHON: 2B protocol
• PYTHON: Use Python and an Arduino to control four servos

Q

• QTPROX: code for using the QTProx401 touch sensor

R

• R/C INTERFACE: a nice blog post with some pretty pictures showing how to RCduino.
• R/C SERVO MOTOR LIBRARY, EXPERIMENTAL:  servo
• R/C SERVO MOTOR LIBRARY, EXPERIMENTAL: servo on pins 9 & 10 only
• R/C SERVO MOTOR LIBRARY, FROM WIRING: servo     (*  may require modifications for use with Arduino *)
  
  
• R/C SERVO MOTOR: code
  
  
• R/C TRANSMITTER: interface Arduino/Freeduino to an R/C stick-type transmitter. With code!
  
  
• READ a button push, and send this data to a PC: tutorial
  
  
• REAL-TIME CLOCK: Wulfden.org's cool RTC module
• REAL-TIME CLOCK: derive the real time from a DCF77 radio clock
• REAL-TIME CLOCK: It was about time that someone wrote a blog post on using the DS1306 SPI real-time clock with Arduino
• REAL-TIME CLOCK: and a little later, someone wrote this poast about using the DS1307!
  
  
• REDUCE: Arduino 0007 sketch size hack
  
  
• RELAYS: drive a simple DC relay: schematic
  
  
• REMOTE CONTROL (IR): IR Remote code for Arduino or Freeduino
  
  
• RFID: read data from the Paralla* RFID reader module: tutorial
• RFID: code and a great article on how to interface Freeduino/Arduino to the Innovations ID-12 RFID
  
  
• RHINO CAD: Script to connect Rhino CAD to Arduino/Freeduino, and another post here
  
  
• RIBBON SENSOR( TOUCH): DIY Article on how to make a ribbon sensor suitable for Arduino
  
  
• ROBODUINO: The best open-source Arduino/Freeduino-based robotics platform, derivd from the original Arduino/Freediuino files.
  
  
• ROTARY ENCODERS: tutorial
  
  
• RUBY: to interface Arduino to ruby, see the Playground Page
• RUBY: "RAD", Ruby on Rails development software for Arduino.

S

• SCALING: Not about fish. this post shows you how to scale floating-point numbers.
• SCALING: Also not about fish. How to scale integers.
  
  
• SD CARD: a blog post on SD interfacing, wth a whole lot of other acronyms like MMC and AVRLIB.
• SD CARD: more, more more on SD card reading and writing
• SD CARD: another blog post on making a "top drawer SD reader"
  

• SECOND LIFE: to interface to Second Life, see the Playground page
  
• SENSING 12V: forum thread
  
  
• SENSING DIRECTION:  forum post on using the HMC6532 compas chip

• SENSORS: a general ist of sensors in the Sensor Wiki

• SENSOR, ACCELERATION: tutorial on using the Memsic 2125 accelerometer with Arduino
• SENSOR, ACCELERATION: article on using the LIS3LV02DQ triple axis accelerometer with Arduino
  

• SENSOR, DISTANCE: tutorial on interfacing a PING ultrasonic distance sensor
• SENSOR, DISTANCE: tutorial on using a Devantec ultrasonic ranger module
• SENSOR, DISTANCE: tutorial on using the Devantec SRF04 and SRF05 modules
• SENSOR, DISTANCE: tutorial on using the Sharp GP2D120 infrared ranging sensor
  

• SENSOR, GAS: sense ammonia, hydrogen sulfide, and toluene
  
  
• SENSOR, GESTURE: video showing how an accelerometer can be used to sense human gesture
  
  
• SENSOR, HUMIDITY: Blog post and code on how to conenct an SHT-15 to Arduino/Freeduino
  
  
• SENSOR, KNOCK: Arduino tutorial on sending a knock.
  
  
• SENSOR, LIGHT: forum post on connecting 3-pin photocell modules
• SENSOR, LIGHT: forum post on how to connect multiple photocells to the Arduino
• SENSOR, LIGHT: French forum post on how to use an LED as a light sensor; english version
  
• SENSOR, LIGHT: blog post on using Arduino and light sensor to control Processsing
• SENSOR, LIGHT: how to use a 2V solar panel as a light sensor

• SENSOR, MOTION: code for using the Paralla* or HVWTec* IR motion sensor
  
  
• SENSOR, POSITION:  tutorial on using rotary encoders
  
  
• SENSOR, PRESSURE: tutorialon using conductive foam as a sensor
• SENSOR, PRESSURE: the infamous "IV bag" sensor video
• SENSORS, PRESSURE: a nice blog post on connecting Freescale pressure sensors
  
  
  
• SENSOR, PROXIMITY: code for using the Paralla* or HVWTec* IR motion sensor
  
  
• SENSOR, ROTATION: tutorial on using rotary encoders
  
  
• SENSOR, SOUND TRIGGER: Article on how to build a "sharp" sound trigger that can be easily interfaced to Freeduino or Arduino
  
  
• SENSOR, SPEED: Chekc out the optical tachometer Instructable here.
  
  
• SENSOR, TEMPERATURE: forum post interfacing to a Dallas 1-wire temp sensor; code
• SENSOR, TEMPERATURE: Tutorial on using an NTC thermistor with Arduino and processing
• SENSOR, TEMPERATURE: forum post on using the LM34 temperature sensors with Arduino
• SENSOR, TEMPERATURE: excellent blog post on how to connect the LM35
  
• SENSOR, TEMPERATURE: tutorial and code for interfacing with the 18B20 temp sensor
• SENSOR, TEMPERATURE: more code for interfacing with the DALLAS 18B20 temp sensor
• SENSOR, TEMPERATURE: code for doing thermistor conversions
  
  
• SENSOR, TOUCH: DIY Article on how to make a ribbon sensor suitable for Arduino
• SENSOR, TOUCH: code for using the QTProx401 touch sensor
  
  
• SENSOR, VELOCITY: see SENSOR, SPEED (look up five centimeteres, or 2 inches in the US)
  
  
• SERIAL EEPROM: tutorial on interfacing with a serial EEPROM using SPI
• SERIAL EEPROM: Wulfden.org's cool RTC module with on-board serial eeprom
  
  
• SERIAL LCD: tutorial on using a serial LCD with the Arduino
  
  
• SERVO MOTOR LIBRARY, EXPERIMENTAL:  servo
• SERVO MOTOR LIBRARY, EXPERIMENTAL: servo on pins 9 & 10 only
  
• SERVO MOTOR LIBRARY, FROM WIRING: servo     (*  may require modifications for use with Arduino *)
  

• SERVO MOTOR: code
• SERVO MOTOR: code and instructions for creating 16 PWM/Servo motor outputs, using a TLC5940
• SERVO MOTOR: the UCLA SenseLab takes a shot at a function for RC servo's
• SERVO MOTOR: blog post including code for the HItec brand of servo.
• SERVO MOTOR: use Python and an Arduino to control four servos
  
  
• SEVERINO: the single-sided DIY Arduino

• SHIELDS: see "Arduino SHIELDS" above
  
  
• SHIFT REGISTER: tutorial on multiplying digital outputs using a 74HC595 shift register
  
  
• SIMPLE MESSAGE SYSTEM: firmware for improved serial communication between Arduino and a host PC

• SLEEP MODE: Arduino needs rest sometimes. Here's how to give it some time in sleep mode
  
  
• SMS: Cell phone SMS Library for Arduino/Freeduino
  
  
• SOFTWARE COMMAND REFERENCE: this page
  
  
• SOFTWARE SERIAL: see the SoftwareSerial library, or the older tutorial
  
  
• SOLENOIDS: a tutorial on driving solenoids
• SOLENOIDS: use a transistor to drive a solenoid from an Arduino pin: schematic
  
  
• SMOOTHING DATA: from a sensor, for example.
  
  
• SONAR: code for the Maxbotix ultrasonic distance sensor (sonar), from a forum post
  
  
• SOUND: control an ipod with optoisolators
• SOUND: serial code for remote control of an IPOD by Arduino
• SOUND: blog posting and Eagle files for building a intervalometer/sound trigger for a camera
  
  
• SPEECH: Midi Speech for Arduino using the SPO256-AL2 chip
• SPEECH:aother blog post on Midi Speech for Arduino using the SPO256-AL2 chip and Ableton Live

• SPI: tutorial on interfacing with a serial EEPROM using SPI (with intorduction to SPI)
• SPI: tutorial on how to control a digital potentiometer using SPI
• SPI: blog post on using the DS1306 SPI real-time clock with Arduino
  

• STEPPER MOTORS: tutorial on driving a unipolar stepper motor with the Arduino
  
  
• STRINGS: todbot explains how to do big strings in Arduino. (That's "strings" in the metaphorical sense.)
  
  
• SUPERCOLLIDER: to interface to Supercollider, see the Playground page
  
  
• SWITCH:read a button push, and send this data to a PC: tutorial
  
  
• SYNTHESIZER:play melodies through a piezo speaker connected to Arduino
• SYNTHESIZER: play musical algorithms through a speaker connected to Arduino
• SYNTHESIZER: Narbotic's Arduino syntheiszer
• SYNTHESIZER: forum discussion on how to generate control voltages for synths
• SYNTHESIZER: the amazing Ardrumo: code and software for a drum kit!
• SYNTHESIZER: Barebones-based hardware/software synthesizer
• SYNTHESIZER: diagram and video describing an Arduino Punk Console
• SYNTHESIZER: Control the AD9851 DDS chip with Arduino/Freeduino

T

• TACHOMETER, OPTICAL: check out the instructable here
  
  
• TEMPERATURE SENSOR: forum post interfacing to a Dallas 1-wire temp sensor; code
• TEMPERATURE SENSOR: Tutorial on using an NTC thermistor with Arduino and processing
• TEMPERATURE SENSOR: forum post on using the LM34 temperature sensors with Arduino
• TEMPERATURE SENSOR: excellent blog post on how to connect the LM35
  
• TEMPERATURE SENSOR: tutorial and code for interfacing with the 18B20 temp sensor
• TEMPERATURE SENSOR: more code for interfacing with the DALLAS 18B20 temp sensor
• TEMPERATURE SENSOR: code for doing thermistor conversions
  
  
• TEXTILES: electronic textiles kit and designs based on Arduino
  
  
• THEREMIN: forum post on using Freeduino or Arduino as a Theremin
• THEREMIN: blog post on making a Theremin with Arduino
  
  
• TILT SENSOR: tutorial
  
  
• TIME: derive the real time from a DCF77 radio clock
• TIME: It was about time that someone wrote a blog post on using the DS1306 SPI real-time clock with Arduino
• TIME: and a little later, someone wrote this poast about using the DS1307!
  
  
• TOUCH SENSING: code for using the QTProx401 touch sensor
• TOUCH SENSING:forum post on using two Arduino pins for capacitive touch sensing
  
  
• TRANSISTOR: use to drive more than one LED from an Arduino pin: schematic
• TRANSISTOR: use to drive a relay from an Arduino pin: schematic
• TRANSISTOR: use to drive a solenoid from an Arduino pin: schematic
  

• TROUBLESHOOTING: troubleshooting section of the Arduino Guide
  
  
• TUTORIALS: see the Arduino main site and Playground.
  
  
• TUTORIAL SHIELD: see the 'Danger' tutorial shield
  
  
• TWI: hack the TWI (two-wire interface) of a Wii "nunchuck" to use with Arduino.