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ATMega168 ATMega328 ATmega1280

Structure

Arduino Cheat Sheet V.02c

Flash (2k for

void setup() void loop()

boobtloader)

16kB

32kB

128kB

Mostly taken from the extended reference:

SRAM

1kB

2kB

8kB

EEPROM

512B

1kB

4kB

Control Structures

Gavin Smith – Robots and Dinosaurs, The Sydney Hackspace

if (x<5){ } else { }

Duemilanove/

Nano/ Pro/

switch (myvar) {

ProMini

Mega

case 1:

14 + 6 analog

External Interrupts

Constants

Qualifiers

break;

# of IO

(Nano has 14+8)

54 + 16 analog

attachInterrupt(interrupt, function,

HIGH | LOW

static // persists between calls

0 - RX1 1 - TX1

case 2:

[LOW,CHANGE,RISING,FALLING])

19 - RX2 18 - TX2

INPUT | OUTPUT

volatile

// use RAM (nice for ISR)

break;

0 - RX

17 - RX3 16 - TX3

detachInterrupt(interrupt)

true | false

const // make read-only

Serial Pins

1 - TX

15 - RX4 14 - TX4

default:

interrupts()

143 // Decimal number

PROGMEM // use flash

2 - (Int 0)

2,3,21,20,19,18

}

noInterrupts()

0173 // Octal number

Ext Interrupts

3 - (Int 1)

(IRQ0- IRQ5)

for (int i=0; i <= 255; i++){ }

5,6 - Timer 0

0b11011111 //Binary

Digital I/O

Libraries:

while (x<5){ }

9,10 - Timer 1

0x7B // Hex number

PWM pins

3,11 - Timer 2

0-13

pinMode(pin, [INPUT,OUTPUT])

do { } while (x<5);

Serial.

10 - SS

53 - SS

7U // Force unsigned

digitalWrite(pin, value)

continue; //Go to next in do/for/while loop

11 - MOSI

51 - MOSI

begin([300, 1200, 2400, 4800, 9600,

10L // Force long

int digitalRead(pin)

12 - MISO

50 - MISO

return x; // Or ‘return;’ for voids.

14400, 19200, 28800, 38400, 57600,

SPI

13 - SCK

52 - SCK

15UL // Force long unsigned

//Write High to inputs to use pull-up res

goto

// considered harmful :-)

Analog4 - SDA

20 - SDA

115200])

10.0 // Forces floating point

I2C

Analog5 - SCK

21 - SCL

end()

2.4e5 // 240000

Analog I/O

int available()

Further Syntax

analogReference([DEFAULT,INTERNA

int read()

// (single line comment)

Data Types

L,EXTERNAL])

flush()

/* (multi-line comment) */

void

int analogRead(pin) //Call twice if

print()

#define DOZEN 12 //Not baker’s!

boolean

(0, 1, false, true)

switching pins from high Z source.

println()

#include <avr/pgmspace.h>

analogWrite(pin, value) // PWM

char (e.g. ‘a’ -128 to 127)

write()

unsigned char (0 to 255)

byte (0 to 255)

EEPROM (#include <EEPROM.h>)

Advanced I/O

General Operators

int

(-32,768 to 32,767)

byte read(intAddr)

tone(pin, freqhz)

= (assignment operator)

unsigned int (0 to 65535)

write(intAddr,myByte)

tone(pin, freqhz ,duration_ms)

+ (addition)

- (subtraction)

word (0 to 65535)

noTone(pin)

Servo (#include <Servo.h>)

* (multiplication) / (division)

long

(-2,147,483,648 to

shiftOut(dataPin, clockPin,

attach(pin , [min_uS, max_uS])

% (modulo)

2,147,483,647)

[MSBFIRST,LSBFIRST], value)

write(angle) // 0-180

== (equal to)

!= (not equal to)

unsigned long (0 to 4,294,967,295)

unsigned long pulseIn(pin, [HIGH,LOW])

writeMicroseconds(uS) //1000-2000,

< (less than)

> (greater than)

(-3.4028235E+38 to

float

1500 is midpoint

<= (less than or equal to)

3.4028235E+38)

Time

read() // 0-180

>= (greater than or equal to)

double (currently same as float)

unsigned long millis() // 50 days overflow.

attached() //Returns boolean

&& (and)

|| (or)

! (not)

sizeof(myint) // returns 2 bytes

unsigned long micros() // 70 min overflow

detach()

delay(ms)

From

Arduino.CC

SoftwareSerial(RxPin,TxPin)

Pointer Access

delayMicroseconds(us)

Strings

& reference operator

// #include<SoftwareSerial.h>

char S1[15];

* dereference operator

begin(longSpeed) // up to 9600

Math

char S2[8]={'a','r','d','u','i','n','o'};

char read() // blocks till data

min(x, y)

max(x, y)

abs(x)

char S3[8]={'a','r','d','u','i','n','o','\0'};

print(myData) or println(myData)

constrain(x, minval, maxval )

//Included \0 null termination

Bitwise Operators

char S4[ ] = "arduino";

map(val, fromL, fromH, toL, toH)

Wire (#include <Wire.h>) // For I2C

& (bitwise and) | (bitwise or)

pow(base, exponent) sqrt(x)

char S5[8] = "arduino";

begin()

// Join as master

^ (bitwise xor) ~ (bitwise not)

char S6[15] = "arduino";

sin(rad)

cos(rad)

tan(rad)

begin(addr) // Join as slave @ addr

<< (bitshift left) >> (bitshift right)

requestFrom(address, count)

Random Numbers

Arrays

beginTransmission(addr) // Step 1

randomSeed(seed) // Long or int

int myInts[6];

send(mybyte)

// Step 2

Compound Operators

long random(max)

int myPins[] = {2, 4, 8, 3, 6};

++ (increment)

-- (decrement)

send(char * mystring)

long random(min, max)

int mySensVals[6] = {2, 4, -8, 3, 2};

+= (compound addition)

send(byte * data, size)

-= (compound subtraction)

endTransmission()

// Step 3

Bits and Bytes

*= (compound multiplication)

byte available() // Num of bytes

Conversion

lowByte()

highByte()

/= (compound division)

byte receive() //Return next byte

char()

byte()

bitRead(x,bitn) bitWrite(x,bitn,bit)

&= (compound bitwise and)

onReceive(handler)

int()

word()

bitSet(x,bitn)

bitClear(x,bitn)

Pics from under C.C. license

|= (compound bitwise or)

onRequest(handler)

long()

float()

bit(bitn) //bitn: 0-LSB 7-MSB

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