Difference between revisions of "Userspace Arduino:BlinkUserspace"
(Created page with "framed|Connecting an LED to the Beaglebone Black") |
(Expand the page) |
||
Line 1: | Line 1: | ||
− | [[File:Blink bb.png| | + | == 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|Connecting an LED to the Beaglebone Black]] <br> | ||
+ | |||
+ | == 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> |
Revision as of 12:13, 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.
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 }