Structure

• void setup()

• arduino.cc/en/Reference/HomePage

• void loop?()

Control Structures

• if
• if...else?
• for?
• switch case?
• while?
• do... while?
• break
• continue?
• return?
• goto?

Further Syntax

• ;? (semicolon)
• {}? (curly braces)
• //? (single line comment)
• /* */? (multi-line comment)

Arithmetic Operators

• = (assignment)
• + (addition)?
• - (subtraction)?
• * (multiplication)?
• / (division)?
• % (modulo)

Comparison Operators

• == (equal to)
• != (not equal to)
• < (less than)
• > (greater than)
• <= (less than or equal to)
• >= (greater than or equal to)

Boolean Operators

• &&? (and)
• ||? (or)
• !? (not)

Compound Operators

• ++? (increment)
• --? (decrement)
• +=? (compound addition)
• -=? (compound subtraction)
• *=? (compound multiplication)
• /=? (compound division)

Variables

Variables are expressions that you can use in programs to store values, such as a sensor reading from an analog pin.

Constants

Constants are particular values with specific meanings.

• HIGH? | LOW?
• INPUT? | OUTPUT?
• true? | false?

• Integer Constants?

Data Types

Variables can have various types, which are described below.

• boolean?
• char?
• byte?
• int?
• unsigned int?
• long?
• unsigned long?
• float?
• double?
• string?
• array?
• void?

Reference

• ASCII chart?

Functions

Digital I/O

• pinMode?(pin, mode)
• digitalWrite?(pin, value)
• int digitalRead?(pin)

Analog I/O

• int analogRead?(pin)
• analogWrite?(pin, value) - PWM

Advanced I/O

• shiftOut?(dataPin, clockPin, bitOrder, value)
• unsigned long pulseIn(pin, value)

Time

• unsigned long millis?()
• delay?(ms)
• delayMicroseconds?(us)

Math

• min?(x, y)
• max(x, y)
• abs?(x)
• constrain?(x, a, b)
• map?(value, fromLow, fromHigh, toLow, toHigh)
• pow?(base, exponent)
• sq?(x)
• sqrt?(x)

Trigonometry

• sin?(rad)
• cos?(rad)
• tan?(rad)

Random Numbers

• randomSeed?(seed)
• long random?(max)
• long random?(min, max)

Serial Communication

Used for communication between the Arduino board and a computer or other devices. This communication happens via the Arduino board's serial or USB connection and on digital pins 0 (RX) and 1 (TX). Thus, if you use these functions, you cannot also use pins 0 and 1 for digital i/o.

• Serial.begin(speed)
• int Serial.available()
• int Serial.read()
• Serial.flush()
• Serial.print?(data)
• Serial.println?(data)

Didn't find something? Check the extended reference? or the libraries?.