Difference between revisions of "Userspace Arduino:BlinkUserspace"

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[[File:Blink bb.png|framed|Connecting an LED to the Beaglebone Black]]
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== Introduction ==
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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.
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[[File:Blink bb.png|thumb|center|Connecting an LED to the Beaglebone Black]]  
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<br style="clear:both" />
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== Hardware ==
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You need:
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* LED: any color and size. 10mm works fine
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* Resistor: > 470Ω to avoid exceeding the current limit of 4 mA per pin
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* Wire to join the stuff
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Wire the LED with the positive (longer) end to P8_19 and the other end to GND.
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== Sketch ==
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Derived from [http://arduino.cc/en/Tutorial/blink Blink]
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<pre>
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/*
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  Blink
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  Turns on an LED on for one second, then off for one second, repeatedly.
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 +
  This example code is in the public domain.
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*/
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// Pin 8_19 has an LED connected to it. It maps to 7 on the Beaglebone Black variant
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// give it a name:
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int led = 7;
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// the setup routine runs once when you press reset:
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void setup() {               
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  // initialize the digital pin as an output.
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  pinMode(led, OUTPUT);   
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}
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// the loop routine runs over and over again forever:
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void loop() {
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  digitalWrite(led, HIGH);  // turn the LED on (HIGH is the voltage level)
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  delay(1000);              // wait for a second
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  digitalWrite(led, LOW);    // turn the LED off by making the voltage LOW
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  delay(1000);              // wait for a second
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}
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</pre>

Latest revision as of 19:14, 17 September 2013

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.

Connecting an LED to the Beaglebone Black


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 Blink

/*
  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
}