Learn How to Program Arduino Boards Today With These Commands – MakeUseOf

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Here are all the commands you need to know to start programming Arduino boards right now.

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Learning to code embedded hardware usually takes years of formal education. Alongside a good understanding of the electronics involved, programming microcontrollers requires a high level of coding knowledge.

Luckily, Arduino boards make the whole process much easier. A range of boards are available, all programmable using the Arduino IDE and Arduino coding library.

This cheat sheet should help you with some of the basic commands you’ll need to start programming Arduino boards.

FREE DOWNLOAD: This cheat sheet is available as a downloadable PDF from our distribution partner, TradePub. You will have to complete a short form to access it for the first time only. Download the Essential Arduino Commands Cheat Sheet.

Basic Arduino Commands

Arduino IDE Toolbar
Verify Scans your code and reports any errors
Upload Compiles your code and uploads it to the Arduino board via USB
New Opens a blank Arduino sketch
Open Opens a list of your saved sketches in the file browser
Save Saves your current sketch
Serial Monitor Opens the serial monitor in a new window
Arduino Program Structure
void setup() { } Runs once at startup
void loop() { } Runs continually
Built in Arduino Functions
Pin setup
pinMode(PIN_NUMBER, INPUT/OUTPUT) Sets the pin at the location PIN_NUMBER to be either an INPUT or an OUTPUT
pinMode(PIN_NUMBER, INPUT_PULLUP) Sets the pin at the location PIN_NUMBER to be an input using the Arduino board’s built-in pull-up resistor
digitalRead(PIN_NUMBER) Reads the input at PIN_NUMBER and returns a 1 or 0 (HIGH or LOW)
digitalWrite(PIN_NUMBER, VALUE) Writes a value of 1 or 0 (HIGH or LOW) to digital pin PIN_NUMBER
analogRead(PIN_NUMBER) Reads the analog pin PIN_NUMBER and returns an integer between 0 and 1023
analogWrite(PIN_NUMBER, VALUE) Emulates analog output VALUE using PWM on PIN_NUMBER (note: only available on pins 3, 5, 6, 9, 10, and 11)
analogReference(DEFAULT) Use the default reference voltage (5V or 3.3V depending on board voltage)
analogReference(INTERNAL) Use an internal reference voltage (1.1v for ATmega168/328p, 2.56 for ATmega 32U4/8)
analogReference(EXTERNAL) Use a voltage applied to the AREF pin as voltage reference (note: 0-5V only)
Time functions
millis() Returns the time in milliseconds since the Arduino sketch began running as an unsigned long integer
micros() Returns the time in microseconds since the Arduino sketch began running as an unsigned long integer
delay(INTEGER) Delays program execution for INTEGER milliseconds
delayMicroseconds(INTEGER) Delays program execution for INTEGER microseconds
Mathematical Functions
min(i, j) Returns the lowest of the two values i and j
max(i,j) Returns the highest of the two values i and j
abs(i) Returns the absolute value of i
sin(angle) Returns the sine of an angle in radians
cos(angle) Returns the cosine of an angle in radians
tan(angle) Returns the tangent of an angle in radians
sqrt(i) Returns the square root of i
pow(base, exponent) Raises the number base to the number exponent (e.g pow (2 , 3) ==8)
constrain(i, minval, maxval) Contrains the value i between minval and maxval
map(val, fromL, fromH, toL, toH) Remaps val from one range to another
random(i) Returns a random long integer smaller than i
random(i, j) Returns a random long integer between i and j
randomSeed(k) Uses the value k to seed the random() function
Casting
(type)variable Casts the value of variable to a new type
Serial Communication
Serial.begin(speed) Start serial communication at a specified speed
Serial.end() Close serial communication
Serial.print(DATA) Prints DATA to the serial port. DATA can be characters, strings, integers and floating point numbers
Serial.available() Return the number of characters available to read in the serial buffer
Serial.read() Read the first character in the serial buffer (returns -1 if no data is available)
Serial.write(DATA) Write DATA to the serial buffer. DATA can be a character, integer, or array
Serial.flush() Clears the serial buffer once outgoing communication is complete
Servo (#include the Servo.h tag)
Servo myServo Creates the variable myServo of type Servo
myServo.attach(PIN_NUMBER) Associated myServo with the pin at location PIN_NUMBER
myServo.write(angle) Writes an angle between 0 and 180 to the servo atached to myServo
myServo.writeMicroseconds(uS) Writes a value in microseconds to the servo attached to myServo (typically between 1000 and 2000 with 1500 as the midpoint)
myServo.read() Returns an integer containing the current angle of the servo between 0 – 180
myServo.attached() Returns true if the servo is attached to a pin
myServo.detach() Dissasociates myServo with an attached pin
myServo.detach() Dissasociates myServo with an attached pin

Create More With Arduino

If you are a beginner, code can seem quite overwhelming, but these commands are enough to get started with most Arduino beginner projects.

So what are you waiting for? Choose an Arduino board and start learning to create your own embedded hardware!



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About The Author

Ian Buckley
(204 Articles Published)

Ian Buckley is a freelance journalist, musician, performer and video producer living in Berlin, Germany. When he’s not writing or on stage, he’s tinkering with DIY electronics or code in the hope of becoming a mad scientist.

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