Command line

stty

Binary

byte b = B10010; byte b = byte(3);

Data Direction Registers

DDRD=0b00111111; // sets 7+6 to input, sets 5-0 to output DDRB=0b110111 // sets pin 13-8 to output, except 11 to input

serial

Serial.begin(9600);   //in setup, 9600 bits per second
Serial.println(val);  //prints variable val

Return Length of Serial data read

Serial.available();

Serial.read()

Serial.write() // binary

Serial.print() // prints without linebreak

pin mode

pinMode(pin, mode)

mode: [INPUT, OUTPUT, INPUT_PULLOUT]

Pin Levels

pinMode == INPUT && readWith == digitalRead && volts > 3v then HIGH

Reference

int[] = {0,1};

#define LED 13

replaced by compiler before code is translated into executable

pinMode(13, OUTPUT);

digitalWrite(13, HIGH);

delay(1000); //delay 1 second

toggle = 1 - toggle;  
//switches between 1 and 0 everytime its called

val = digitalRead(BUTTON)

val = analogRead(9);

map(x, 0, 1023, 0, 7);