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<p class='vspace'></p><h2>Keywords</h2>
<p>Keywords are constants, variables and function names that are defined as part of the Arduino language. Avoid using keywords for variable names.
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<table width='90%' border='0' cellpadding='5' cellspacing='0'><tr><td width='33%' valign='top'>
<pre>
# Constants
HIGH
LOW
INPUT
OUTPUT
SERIAL
DISPLAY
PI
HALF_PI
TWO_PI
LSBFIRST
MSBFIRST
CHANGE
FALLING
RISING
false
true
null
# Port Variables & Constants
DDRB
PINB
PORTB
PB0
PB1
PB2
PB3
PB4
PB5
PB6
PB7
DDRC
PINC
PORTC
PC0
PC1
PC2
PC3
PC4
PC5
PC6
PC7
DDRD
PIND
PORTD
PD0
PD1
PD2
PD3
PD4
PD5
PD6
PD7
# Datatypes
boolean
byte
char
class
default
do
double
int
long
</pre></td><td width='33%' valign='top'>
<pre>
private
protected
public
return
short
signed
static
switch
throw
try
unsigned
void
# Other
abs
acos
+=
+
[]
asin
=
atan
atan2
&
|
boolean
byte
case
ceil
char
char
class
,
//
?:
constrain
cos
{}
--
default
delay
delayMicroseconds
/
/**
.
else
==
exp
false
float
float
floor
for
<
<=
HALF_PI
if
++
!=
int
<<
<
<=
log
&&
!
||
</pre>
<p class='vspace'></p></td><td width='33%' valign='top'>
<p class='vspace'></p><pre>
loop
max
millis
min
-
%
/*
*
new
null
()
PI
return
>>
;
Serial
Setup
sin
sq
sqrt
-=
switch
tan
this
true
TWO_PI
void
while
Serial
begin
read
print
write
println
available
digitalWrite
digitalRead
pinMode
analogRead
analogWrite
attachInterrupts
detachInterrupts
beginSerial
serialWrite
serialRead
serialAvailable
printString
printInteger
printByte
printHex
printOctal
printBinary
printNewline
pulseIn
shiftOut
</pre></td></tr></table>
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