Spark: Intro to Arduino

1_barebones.ino

void setup() {
  // This code is run once, each time the Arduino is powered on or reset
}

void loop() {
  // This code is run repeatedly, as fast as the Arduino can run it
}

2_blink_led.ino

const int LED = 13;         // Use the built-in LED on digital pin 13

void setup() {
  pinMode(LED, OUTPUT);     // set the digital GPIO to control state
}

void loop() {
  digitalWrite(LED, HIGH);  // turn the LED on
  delay(250);               // wait 1/4 second
  digitalWrite(LED, LOW);   // turn the LED off
  delay(250);               // wait another 1/4 second
}

3_reading_simple_sensor.ino

const int LED = 13;
const int BUTTON = 5;       // use a momentary switch

void setup() {
  pinMode(LED, OUTPUT);
  pinMode(BUTTON, INPUT_PULLUP);
}

void loop() {
  if (digitalRead(BUTTON) == LOW) {
    digitalWrite(LED, HIGH);
    delay(250);
    digitalWrite(LED, LOW);
    delay(250);
  }
}

4_read_analog_sensor.ino

// For this example, I'm using an FSR, but just about any simple analog sensor would work
const int SENSOR_PIN = A0;
int fsrReading = 0;

void setup() {
  Serial.begin(9600);   // fire up Serial so we can output values to the console
}

void loop() {
  // Read the state of the analog pin, and get back a value in the range 0-1024
  fsrReading = analogRead(SENSOR_PIN);
  
  // Display the value we read on the Serial console
  Serial.print("The current reading from the FSR is: ");
  Serial.println(fsrReading);
}