Structure

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

Data

Primitive

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

Composite

String
Vector
array

Constant Types

ByteTable
CharTable
Constant
ConstantString
DoubleTable
FloatTable
IntTable
LongTable
UCharTable
UIntTable
ULongTable

Conversion

byte()
char()
float()
int()
long()
splitString()
toAscii()
toLowerCase()
toUpperCase()

Bit, byte and word handling

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

Character classification

isAlpha()
isAlphaNumeric()
isAscii()
isControl()
isDigit()
isGraph()
isHexadecimalDigit()
isLowerCase()
isPrintable()
isPunct()
isSpace()
isUpperCase()
isWhitespace()

Qualifiers

const
static
volatile

Pointer Operators

* (dereference operator)
& (reference operator)

Utilities

sizeof()

Control

Relational Operators

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

Iteration

for()
while()

Conditionals

break
case
default
else
if()
switch()

Logical Operators

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

Input/Output

Pin digital Input/Output

digitalRead()
digitalWrite()
pinMode()

Pin digital Input pullup

noPullup()
pullup()

Port digital Input/Output

portMode()
portRead()
portWrite()

Pin Bit Shifting

shiftIn()
shiftOut()

Pin analog Input

analogRead()
analogReference()

Pin PWM (analog) Output

analogWrite()
noAnalogWrite()

Pin PWM Advanced Settings

setPWMPrescale()
setPWMResolution()

Time

delay()
delayMicroseconds()
micros()
millis()

Pulse Input (polled)

pulseIn()

Interrupts

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

Tone output generation

getTonePolyphony()
noTone()
setTonePolyphony()
tone()

Serial Communication

Serial

Power Management

disablePower()
enablePower()

Advanced Power Management

noSleep()
sleep()
sleepMode()

Math

Operators

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

Bitwise Operators

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

Calculation

abs()
ceil()
constrain()
exp()
fabs()
floor()
fma()
fmax()
fmin()
fmod()
ldexp()
log()
log10()
map()
max()
min()
pow()
round()
signbit()
sq()
sqrt()
square()
trunc()

Trigonometry

acos()
asin()
atan()
atan2()
cos()
cosh()
degrees()
hypot()
radians()
sin()
sinh()
tan()
tanh()

Random

random()
randomSeed()

Operator

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

Constants

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