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1  Using Arduino / Networking, Protocols, and Devices / Control an RGB LED Wirelessly with Bluetooth Low Energy on: December 24, 2012, 02:02:00 am
I used a RedBearLab BLE Shield to wirelessly control an RGB LED with Bluetooth Low Energy (BT4.0)

2  Using Arduino / Programming Questions / Re: Strange Compile Error on: June 26, 2011, 11:22:22 pm
d'oh! I should have known that! Thanks!
3  Using Arduino / Programming Questions / Re: Strange Compile Error on: June 26, 2011, 07:40:06 pm
@PaulS, The numbers I'm using for the pins are fake.  I just couldn't remember which real pins I was using when I started typing this code.

@Bubulindo, Yes, I'm instantiating a LiquidCrystal inside a class definition.  This is valid C++ code, and shouldn't cause an error, especially the strange message that I'm getting.

Thanks for you all your feedback so far.
4  Using Arduino / Programming Questions / Strange Compile Error on: June 26, 2011, 06:12:38 pm
Here's a small fragment of code that causes a weird error:

#include <LiquidCrystal.h>
class obd {
  LiquidCrystal lcd(1,2,3,4,5,6);
  obd() {}

sketch_jun26a:3: error: expected identifier before numeric constant
sketch_jun26a:3: error: expected ',' or '...' before numeric constant

Now, if I move the

LiquidCrystal lcd(1,2,3,4,5,6);

line out of the class definition like this:

#include <LiquidCrystal.h>
  LiquidCrystal lcd(1,2,3,4,5,6);
class obd {
  obd() {}

Then it compiles fine.  Does anyone know how to fix this?
Thanks in advance!!
5  Community / Exhibition / Gallery / Re: Lampduino - an 8x8 RGB LED Floor Lamp on: March 23, 2011, 01:50:39 pm
I finished building the Lampduino.  You can read about it here:

6  Using Arduino / Interfacing w/ Software on the Computer / Re: Serial latency on: March 20, 2011, 01:57:10 pm
Actually, the problem is just that the default setting on the FTDI driver is for 16ms latency.  In Win32, you can tune it down to 1ms.  I wrote an article on my blog on how to do that:

Reducing Arduino/FTDI FT232R Serial Latency:
7  Community / Exhibition / Gallery / Lampduino - an 8x8 RGB LED Matrix Floor Lamp on: March 17, 2011, 07:29:32 pm
I'm building a free-standing 8x8 RGB LED matrix.  Unlike the coffee-table style builds, this one will stand vertically, with light coming out both sides.  I just finished wiring up the matrix and doing initial testing.

I'm using a Colorduino ( from ITead Studio.  If you're interested in following the build, I'm documenting it as I go.

8x8 RGB LED Matrix Construction: Step 1 - Cutting Foam Board:
8x8 RGB LED Matrix Construction: Step 2 - Wiring:
8  Using Arduino / LEDs and Multiplexing / Re: Tri-state Multiplexing on: March 09, 2011, 09:54:07 pm
But if you're lighting the LED's w/ a 50% duty cycle, they're on only half the time, so aren't you getting just half the brightness?
Or does the nonlinearity of the eye make it appear brighter than 50%?
9  Using Arduino / LEDs and Multiplexing / Re: Will this work? Run 2x as many LEDs with same current, using tri-state logic. on: March 09, 2011, 12:31:42 pm
You have 15 LEDs total, right?
You could use a different approach ... wire them up as a 5x3 matrix, and then multiplex them in software.
Just get rid of 2 of the rows in my 5x5 matrix detailed here:
All you need is 5 resistors.
10  Using Arduino / LEDs and Multiplexing / Re: Rainbowduino issues on: March 09, 2011, 12:08:37 pm
I'm not sure if this will help, since I don't have a mega, but did you try uploading an empty sketch to the mega?

void setup() {}
void loop() {}

This is supposed to help on the 328-based boards.  Personally, I just run my Duemilanove with the ATmega removed.
11  Using Arduino / LEDs and Multiplexing / Colorduino Library V1.0 Released on: March 04, 2011, 02:50:42 pm
I wrote an interface library for ITead Studio's Colorduino and Arduino RGB LED Matrix driver shield.
You can download it here:

If you haven't seen the Colorduino before, I wrote a preview of it here:
12  Community / Exhibition / Gallery / Another Daft Punk Display on: February 19, 2011, 02:48:32 pm
I built a Daft Punk display using 5x5 warm white LED's and a Duemilanove clone.

My Instructable is a finalist in the SparkFun Microcontroller Challenge
13  Development / Other Software Development / Burning Sketches with External Programmers on: February 17, 2011, 11:55:53 am
I found the description here a bit confusing,
so I wrote a new how-to for using your arduino IDE to burn sketches with a hardware programmer
such as the USBtinyISP here:
In the writeup, I show how to set up your IDE so that you can still burn sketches with a programmer.
Hope someone finds it useful.

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