Structure

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

Data

Primitive

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

Composite

array
Vector
String

Constant Types

UCharTable
Constant
CharTable
ByteTable
UIntTable
DoubleTable
FloatTable
ConstantString
ULongTable
IntTable
LongTable

Conversion

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

Bit, byte and word handling

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

Character classification

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

Qualifiers

volatile
static
const

Pointer Operators

* (dereference operator)
& (reference operator)

Utilities

sizeof()

Control

Relational Operators

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

Iteration

for()
while()

Conditionals

switch()
case
default
if()
else
break

Logical Operators

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

Input/Output

Pin digital Input/Output

digitalRead()
digitalWrite()
pinMode()

Pin digital Input pullup

pullup()
noPullup()

Port digital Input/Output

portRead()
portMode()
portWrite()

Pin Bit Shifting

shiftIn()
shiftOut()

Pin analog Input

analogReference()
analogRead()

Pin PWM (analog) Output

analogWrite()
noAnalogWrite()

Pin PWM Advanced Settings

setPWMResolution()
setPWMPrescale()

Time

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

Pulse Input (polled)

pulseIn()

Interrupts

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

Tone output generation

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

Serial Communication

Serial

Power Management

disablePower()
enablePower()

Advanced Power Management

noSleep()
sleepMode()
sleep()

Math

Operators

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

Bitwise Operators

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

Calculation

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

Trigonometry

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

Random

random()
randomSeed()

Operator

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

Constants

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