A-Teachers-Guide-to-the-Intel-Galileo-Final

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19 | Beginning with ArduinoCoding InstructionsFrom the Arduino IDE, go to File > Examples > 01.Basics > Blink and open the example code./*BlinkTurns on an LED on for one second, then off for one second, repeatedly.*/// Pin 13 has an LED connected on most Arduino boards.int led = 13; // this assigns an integer type variable named led to pin 13// the setup routine runs once when you press reset:void setup() {// initialize the digital pin as an output.pinMode(led, OUTPUT);}// the loop routine runs over and over again forever:void loop() {digitalWrite(led, HIGH); // turn the LED on (HIGH is the voltage level)delay(1000);// wait for a seconddigitalWrite(led, LOW); // turn the LED off by making the voltage LOWdelay(1000);// wait for a second}
A TEACHER’S GUIDE TO THE INTEL® GALILEO | 20Explanation of the Arduino CodeIn Arduino programs, there are always two functions: setup and loop.The setup() function runs once when you load a new program or press the reset button. It isrepresented by the code:void setup() {….}The loop() function runs after the setup function and runs over and over again forever. It isrepresented by the code:void loop() {….}The digital pins on the Arduino, (0 – 13) located next to the USB slot can be set to be eitheroutput or input pins using the command, pinMode(). The pinMode function expects two inputsinside the parentheses: the first input is the number of the Arduino pin while the second input iseither OUTPUT or INPUT.In order to set an output on the Arduino we use the command digitalWrite. It also takes twoinputs: the first input is the number of the Arduino pin to write to and the second input iswhether to write HIGH or LOW.The delay command makes the program wait for a certain number of milliseconds beforemoving onto the next command. Thus:delay(1000);instructs the code to wait for 1 second.A note on commentsComments are lines of script inside an Arduino sketch that provide notes to yourself or otherusers. These can be about the program’s functionality, any issues with the code, or anything elseyou would like a user to understand about your program. Comments are ignored by the ArduinoIDE and are not uploaded to the Intel Galileo hardware. Comments are often signified with thesymbols “//” or “/* */” and can be written as follows:// This is a single line comment. Anything after the slashes is a comment// to the end of the line/* this is a multiline comment- use it to comment out whole blocks of code*/Visual Programming with ArdublockWhat is ArduBlock?ArduBlock is an optional add-on to the Arduino IDE that uses a visual programming language togenerate code for Arduino hardware.Using an interface similar to other visual programming languages such as Scratch, Blockly, andHopscotch, ArduBlock can make programming Arduino hardware more accessible for youngerstudents or provide a quick solution to testing new programs. After creating a program inArduBlock, students can export the code as C/C++ for use within the Arduino IDE, allow them totransition to text-based coding.
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