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Introduction to Arduino. A very basic intro to Arduino, the IDE and the Servos class. The Arduino Board. The Arduino Board. Pins 0-13 can be used for input or output 3 Ground Ports 1 5V Port 1 3.3V Port Some ports support PWM (Pulse Wave Modulation): Ports 3,5,6,10,11

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Introduction to Arduino

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Introduction to Arduino

A very basic intro to Arduino, the IDE and the Servos class


The Arduino Board


The Arduino Board

  • Pins 0-13 can be used for input or output

  • 3 Ground Ports

  • 1 5V Port

  • 1 3.3V Port

  • Some ports support PWM (Pulse Wave Modulation): Ports 3,5,6,10,11

  • Ports 0/1 are RX (Receiving), and TX (Sending) – Typically used for Bluetooth Modules/Shields


The IDE

  • IDE stands for “Integrated Development Environment” – This helps us rapidly develop and deploy programs to our Arduino

  • Arduino provides a Windows Install File to help us install the IDE and the necessary drivers for communicating with our Arduino


The IDE


The IDE

  • The previous slide shows the basic layout when you open the Arduino IDE

  • Typically, Arduino is coded in C++ -- the compiler/assembler will do the rest

  • Two methods: setup() and loop() – you may add your own classes for inclusion as well as writing your own methods to be called

  • Setup() is only called once and is typically used to setup ports on your Arduino among other things

  • Loop() is where you put code that you want run until you turn off your Arduino


The IDE


The IDE


The IDE


The IDE

  • As you can see, the IDE is fairly powerful and complete. However, for this tutorial, we are only going to be concerning ourselves with “File” and “Sketch”


Basics of Arduino Programming

  • Pretty much the same as any other Programming Languages.

  • Sample Code to turn LEDs on and off on the next page


Sample Code

  • Int LED0 = 2;intdelay_time = 100;void setup() {pinMode(LED0, OUTPUT);}void loop() {digitalWrite(LED0,HIGH);delay(delay_time);digitalWrite(LED0,LOW);}


Sample Code Breakdown

  • We declare and initialize a variable “LED0” with our Port number (In this instance, it is 2 but if you had your cable plugged into 13, it would be 13)

  • We declare and initialize a variable “delay_time.” This sets the time between turning the LED on/off.

  • Setup() is called and we use pinModeto set LED0 as an Output port on the Arduino. Ports are bi-directional. They can be used as Input or Output.


Sample Code Breakdown

  • After setup() has finished running, the Arduino then calls loop()

  • In the loop, we have 2 items: digitalWrite and delay

  • digitalWrite(LED0,HIGH) turns the LED on

  • digitalWrite(LED0,LOW) turns the LED off

  • Delay(delay_time) sets how long it is waiting before the next instruction is run on the Arduino.


Servos

  • Let’s switch to something a little bit more advanced than LEDs.

  • Arduino provides a class to power and control Servo motors

    • See: http://arduino.cc/en/reference/servo

  • All you do is put #include <Servo.h> before anything else and off you go.

  • My example will be slightly different


Servo Code

  • #include <ContinuousRotationServo.h>ContinuousRotationServo Servo;ContinuousRotationServoServoTwo;int timer = 3;void setup() {Servo.begin(13);Servo.begin(12);}void loop() {Servo.rotateLeft(100);ServoTwo.rotateRight(100);delay(timer);}


Servos Code Breakdown

  • We create objects of our ContinuousRotationServo class.

  • In setup, it is effectively doing the same thing as what we were doing earlier in our LED example.

  • In loop, we are having the Arduino move one Servo left and one Servo right. In this specific case, the Servos are attached to a Parallax Bo-Bot body with the Arduino and breadboard sitting on top so it is moving in a straight line.


Questions? Comments?

  • If you have any questions or comments, please register on my website and post on a comment on the Arduino page located on the Computer Science portion of my website.

  • PPT Last Updated on: 12/26/2013


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