ARDUINO CHEAT SHEET
For more information visit: http://arduino.cc/en/Reference/
LilyPad ProtoSnap Simple:
RedBoard:
Structure
/* Each Arduino sketch must contain the
following two functions. */
void setup()
{
/* this code runs once at the beginning of
the code execution. */
}
void loop()
{
/* this code runs repeatedly over and over
as long as the board is powered. */
}
Comments
// this is a single line
/* this is
a multiline */
Setup
pinMode(pin, [INPUT \ OUTPUT \ INPUT_PUL-
LUP]);
/* Sets the mode of the digital I/O pin.
It can be set as an input, output, or an
input with an internal pull-up resistor.
*/
Control Structures
if(condition)
{
// if condition is TRUE, do something here
}
else
{
// otherwise, do this
}
for(initialization; condition; increment)
{
// do this
}
/* The ‘for’ statement is used to repeat
a block of statements enclosed in curly
braces. An increment counter is usually
used to increment and terminate the loop.
*/
Digital I/O
digitalWrite(pin, val);
/* val = HIGH or LOW write a HIGH or a LOW
value to a digital pin. */
int var = digitalRead(pin);
/* Reads the value from a specified digital
pin, either HIGH or LOW. */
Analog I/O
analogWrite(pin, val);
/* Writes an analog value to a pin.
val = integer value from 0 to 255 */
int var = analogRead(pin);
/* Reads the value from the specified
analog pin. */
Advanced I/O
tone(pin, freq);
/* Generates a square wave of the specified
frequency to a pin. Pin must be one of the
PWM (~) pins. */
tone(pin, freq, duration);
/* Generates a square wave of the specified
frequency to a pin for a duration in
milliseconds. Pin must be one of the PWM (~)
pins. */
noTone(pin);
// Turns off the tone on the pin.
Time
delay(time_ms);
/* Pauses the program for the amount of time
(in milliseconds). */
delayMicroseconds(time_us);
/* Pauses the program for the amount of time
(in microseconds). */
millis();
/* Returns the number of milliseconds since
the board began running the current program.
max: 4,294,967,295 */
micros();
/* Returns the number of microseconds since
the board began running the current program.
max: 4,294,967,295 */
Data Types
void
// nothing is returned
boolean
// 0, 1, false, true
char
// 8 bits: ASCII character
byte
// 8 bits: 0 to 255, unsigned
int
// 16 bits: 32,768 to 32,767, signed
long
/* 32 bits: 2,147,483,648
to 2,147,483,647, signed */
float
// 32 bits, signed decimal
Constants
HIGH \ LOW
INPUT \ OUTPUT
true \ false
Mathematical Operators
=
// assignment
+
// addition
-
// subtraction
*
// multiplication
/
// division
%
// modulus
Logical Operators
==
// boolean equal to
!=
// not equal to
<
// less than
>
// greater than
<=
// less than or equal to
>=
// greater than or equal to
&&
// Boolean AND
||
// Boolean OR
!
// Boolean NOT
Bitwise Operators
&
// bitwise AND
|
// bitwise OR
^
// bitwise XOR
~
// bitwise INVERT
var << n
// bitwise shift left by n bits
var >> n
// bitwise shift right by n bits
Libraries
#include <libraryname.h>
/* this provides access to special
additional functions for things such as
servo motors, SD card, wifi, or bluetooth.
*/
ATmega328
Microcontroller
Temperature
Sensor
Button Vibe Motor
RGB LED
Switch
Light
Sensor
Buzzer/
Speaker
LEDs
(Light Emitting Diodes)
Power In
Power
5V / 3.3 / GND
USB to Computer
Reset
Analog
Inputs
SCL/SDA
(I2C Bus)
ATmega328
Microcontroller
Digital I/O
PWM(3,5,6,9,10,11)
