Structure

; (semicolon)
[] (array access)
true
setup()
, (comma)
loop()
delete
// (comment)
new
{} (curly braces)
() (parentheses)
. (dot)
= (assign)
void
/* */ (multiline comment)
false
return
#include
null

Data

Primitive

unsigned int
byte
boolean
double
unsigned char
char
int
unsigned long
float
long

Composite

array
Vector
String

Conversion

char()
boolean()
float()
int()
long()
byte()
splitString()

Bit, byte and word handling

makeWord()
bitRead()
bitWrite()
highByte()
bit()
lowByte()

Control

Relational Operators

>= (greater than or equal to)
!= (inequality)
<= (less than or equal to)
== (equality)
< (less than)
> (greater than)

Iteration

for()
while()

Conditionals

case
else
switch()
break
default
if()

Logical Operators

! (logical NOT)
&& (logical AND)
|| (logical OR)

Input/Output

Pin digital Input/Output

pinMode()
digitalRead()
shiftOut()
digitalWrite()

Port digital Input/Output

portWrite()
portRead()
portMode()

Pin analog Input

analogRead()

Pin PWM (analog) Output

analogWrite()

Time

millis()
delayMicroseconds()
delay()

Pulse Input (polled)

pulseIn()

Pulse output generation

pulseStop()
pulseRunning()
pulseOut()

Interrupts

noInterrupts()
detachInterrupt()
interrupts()
attachInterrupt()
interruptMode()

Math

Operators

-= (subtract assign)
+= (add assign)

Bitwise Operators

& (bitwise AND)
|= (bitwise OR and assign)
<< (bitwise bit shift left)
| (bitwise OR)
&= (bitwise AND and assign)
^ (bitwise XOR)
˜ (bitwise ones complement)
>> (bitwise bit shift right)

Calculation

ceil()
constrain()
map()
round()
max()
abs()
pow()
floor()
sqrt()
min()
sq()

Trigonometry

radians()
degrees()
sin()
cos()
tan()
atan2()

Random

random()
randomSeed()

Operator

+ (addition)
% (modulo)
* (multiply)
/ (divide)
- (negation)
- (minus)
++ (increment)
-- (decrement)

Constants

LSBFIRST
TWO_PI (6.28318...)
RISING
LOW
HIGH
OUTPUT
CHANGE
PI (3.14159...)
FALLING
HALF_PI (1.57079...)
MSBFIRST
INPUT