Built-in Examples are sketches included in the Arduino Software (IDE), to open them click on the toolbar menu: File > Examples. These simple programs demonstrate all basic Arduino commands.
1. Basics
- Analog Read Serial: Read a potentiometer, print its state out to the Arduino Serial Monitor.- Bare Minimum: The bare minimum of code needed to start an Arduino sketch.
- Blink: Turn an LED on and off.
- Digital Read Serial: Read a switch, print the state out to the Arduino Serial Monitor.
- Fade: Demonstrates the use of analog output to fade an LED.
- Read Analog Voltage: Reads an analog input and prints the voltage to the Serial Monitor.
- Button: Use a pushbutton to control an LED.
- Debounce: Read a pushbutton, filtering noise.
- Digital Input Pullup: Demonstrates the use of INPUT_PULLUP with pinMode().
- State Change Detection: Count the number of button pushes.
- Tone Keyboard: A three-key musical keyboard using force sensors and a piezo speaker.
- Tone Melody: Play a melody with a Piezo speaker.
- Tone Multiple: Play tones on multiple speakers sequentially using the tone() command.
- Tone Pitch Follower: Play a pitch on a piezo speaker depending on an analog input.
3. Analog
- Analog In Out Serial: Read an analog input pin, map the result, and then use that data to dim or brighten an LED.- Analog Input: Use a potentiometer to control the blinking of an LED.
- Analog Write Mega: Fade 12 LEDs on and off, one by one, using an Arduino Mega board.
- Calibration: Define a maximum and minimum for expected analog sensor values.
- Fading: Use an analog output (PWM pin) to fade an LED.
- Smoothing: Smooth multiple readings of an analog input.
4. Communication
These examples include code that allows the Arduino to talk to Processing sketches running on the computer. For more information or to download Processing, see processing.org. There are also Max/MSP patches that can communicate with each Arduino sketch as well. For more on Max/MSP see Cycling 74.
- Dimmer: Move the mouse to change the brightness of an LED.
- Graph: Send data to the computer and graph it in Processing.
- Midi: Send MIDI note messages serially.
- Multi Serial Mega: Use two of the serial ports available on the Arduino Mega.
- Physical Pixel: Turn a LED on and off by sending data to your Arduino from Processing or Max/MSP.
- Read ASCII String: Parse a comma-separated string of integers to fade an LED.
- Serial Call Response: Send multiple variables using a call-and-response (handshaking) method.
- Serial Call Response ASCII: Send multiple variables using a call-and-response (handshaking) method, and ASCII-encode the values before sending.
- Serial Event: Demonstrates the use of SerialEvent().
- Virtual Color Mixer: Send multiple variables from Arduino to your computer and read them in Processing or Max/MSP.
5. Control Structures
- For Loop Iteration: Control multiple LEDs with a for loop.
- If Statement Conditional: Use an ‘if statement’ to change the output conditions based on changing the input conditions.
- Switch Case: How to choose between a discrete number of values.
- Switch Case 2: A second switch-case example, showing how to take different actions based on the characters received in the serial port.
- While Statement Conditional: How to use a while loop to calibrate a sensor while a button is being read.
6. Sensors
- ADXL3xx: Read an ADXL3xx accelerometer.
- Knock: Detect knocks with a piezo element.
- Memsic2125: Two-axis accelerometer.
- Ping: Detect objects with an ultrasonic range finder.
- Bar Graph: Make an LED bar graph.
- RowColumnScanning: Control an 8x8 matrix of LEDs.
- String Addition Operator: Add strings together in a variety of ways.
- String Append Operator: Use the += operator and the concat() method to append things to Strings.
- String Case Changes: Change the case of a string.
- String Characters: Get/set the value of a specific character in a string.
- String Comparison Operators: Compare strings alphabetically.
- String Constructors: Initialize string objects.
- String Index Of: Look for the first/last instance of a character in a string.
- String Length & String Length Trim: Get and trim the length of a string.
- String Replace: Replace individual characters in a string.
- String Start With Ends With: Check which characters/substrings a given string starts or ends with.
- String Substring: Look for "phrases" within a given string.
- String To Int: Allows you to convert a String to an integer number.
- Keyboard Logout: Logs out the current user with key commands.
- Keyboard Message: Sends a text string when a button is pressed.
- Keyboard Reprogram: Opens a new window in the Arduino IDE and reprograms the Leonardo with a simple blink program.
- Keyboard Serial: Reads a byte from the serial port, and sends back a keystroke.
- Keyboard Mouse Control: Demonstrates the Mouse and Keyboard commands in one program.
pushbuttons.
- Joystick Mouse Control: Controls a computer's cursor movement with a Joystick when a button is pressed.
- Knock: Detect knocks with a piezo element.
- Memsic2125: Two-axis accelerometer.
- Ping: Detect objects with an ultrasonic range finder.
7. Display
- Bar Graph: Make an LED bar graph.- RowColumnScanning: Control an 8x8 matrix of LEDs.
8. Strings
- Character Analysis: Use the operators to recognise the type of character we are dealing with.- String Addition Operator: Add strings together in a variety of ways.
- String Append Operator: Use the += operator and the concat() method to append things to Strings.
- String Case Changes: Change the case of a string.
- String Characters: Get/set the value of a specific character in a string.
- String Comparison Operators: Compare strings alphabetically.
- String Constructors: Initialize string objects.
- String Index Of: Look for the first/last instance of a character in a string.
- String Length & String Length Trim: Get and trim the length of a string.
- String Replace: Replace individual characters in a string.
- String Start With Ends With: Check which characters/substrings a given string starts or ends with.
- String Substring: Look for "phrases" within a given string.
- String To Int: Allows you to convert a String to an integer number.
9. USB
The Keyboard and Mouse examples are unique to the Leonardo, Micro and Due. They demonstrate the use of libraries that are unique to the board.KEYBOARD
- Keyboard Logout: Logs out the current user with key commands.
- Keyboard Message: Sends a text string when a button is pressed.
- Keyboard Reprogram: Opens a new window in the Arduino IDE and reprograms the Leonardo with a simple blink program.
- Keyboard Serial: Reads a byte from the serial port, and sends back a keystroke.
- Keyboard Mouse Control: Demonstrates the Mouse and Keyboard commands in one program.
MOUSE
- Button Mouse Control: Control cursor movement with 5pushbuttons.
- Joystick Mouse Control: Controls a computer's cursor movement with a Joystick when a button is pressed.
