View source for Userspace Arduino:BlinkUserspace

== Introduction ==


This is the most basic example for the Userspace Arduino library involving blinking an LED from a sketch. For the Beaglebone Black, the current variant has a setup as shown in the diagram.
[[File:Blink bb.png|thumb|center|Connecting an LED to the Beaglebone Black]] 
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== Hardware ==

You need:

* LED: any color and size. 10mm works fine
* Resistor: > 470Ω to avoid exceeding the current limit of 4 mA per pin
* Wire to join the stuff

Wire the LED with the positive (longer) end to P8_19 and the other end to GND.

== Sketch ==

Derived from [http://arduino.cc/en/Tutorial/blink Blink]

<pre>
/*
  Blink
  Turns on an LED on for one second, then off for one second, repeatedly.
 
  This example code is in the public domain.
 */
 
// Pin 8_19 has an LED connected to it. It maps to 7 on the Beaglebone Black variant
// give it a name:
int led = 7;

// 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 second
  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
  delay(1000);               // wait for a second
}

</pre>