DFRduino Robot Workshop

// Declare the variables we'll use in the sketch
// Definitions of variables come in the form:
// [type] [name] = [value];
// int stands for integer (a whole number, not a decimal)
int delayTimeInMiliSeconds = 500;
// LEDs are a type of light
// A pin is a port on the arduino in which we can plug wires into and control
// things
int ledPin = 13;

// setup() runs only once
void setup() {
    // Set the ledPin (13) to be an output
    pinMode(ledPin, OUTPUT);
}

// Loop runs continuously, when it's finished, it reruns itself
void loop() {
    // Here we run the 'flash()' function over and over again
    flash();
}

// This is the 'flash()' function definition
// Function definitions look like this:
// [type] [name]() {
//      [code]
// }
// 'type' is the type of value returned if you use any 'return' statments in
// your function. E.g. 'void' if you don't return anything.
// 'name' is the name you use to run the code, e.g. 'flash'
// 'code' is the code that your function will run when you call it. 'call'ing a
// function is achieved by writing 'name()'
//
// The curly braces: '{' and '}' enclose the code that runs when
// 'flash()' is run.
void flash() {
    // digitalWrite allows us to control a pin (in this case, pin 13) and change
    // it's value.
    digitalWrite(ledPin, HIGH);
    // delay for the amount of time we declared at the start of the sketch
    delay(delayTimeInMiliSeconds);
    // output a LOW (0V) signal on the ledPin
    // this turns the LED off, as it will no longer have a current flowing
    // through it
    digitalWrite(ledPin, LOW);
    // Again, delay like last time
    delay(delayTimeInMiliSeconds);
}