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1  Community / Products and Services / LIT Halo - responsive LED headband on: May 17, 2014, 12:20:21 pm
We started messing around with Arduino and electronics in general about 2 1/2 years ago. Last week, we launched a Kickstarter project to fund our invention.

The Halo is an LED headband that responds to music. It is built around the AtMega328. We utilize an MSGEQ7 chip that discerns between different frequencies in sound picked up by an electret microphone. We also use an MCP4131, a digital potentiometer for adjusting the sensitivity of the audio amplifier circuit. The hardware also includes a USB charger for 2 lithium ion batteries and a power regulator circuit for the arduino. All or the hardware is populated on flex circuit board that we designed ourselves.

We have created a software architecture for developing responsive patterns on the 32 RGB LEDs present on the Halo. Beat detection algorithms are build into the architecture. We’ll post our code to github at the end of our kickstarter campaign.

If you are interested in this project or have any questions about how we designed it, please message me.

Link to our kickstarter campaign for more information.

2  Using Arduino / LEDs and Multiplexing / Re: Super Low Price LPD8806 RGB LED Strips - Want? on: August 30, 2013, 03:55:40 pm
bumping this thread.

i know there are more people out there looking for these things cheap. I've gotten rid of a bunch of them and have a few left.

$80 per each 5-meter reel. I would lower the price per reel if you're interested in a bulk order.

Message me or post here if interested. I accept paypal and venmo payments.
3  Using Arduino / LEDs and Multiplexing / Re: Super Low Price LPD8806 RGB LED Strips - Want? on: July 18, 2013, 10:30:48 am

Thanks for the post. I agree that it would have been better if the VCC and GND pins weren't right next to each other, but oh well.

Your project looks awesome, and I'm glad the LPD8806 strips are working out in your favor.
4  Using Arduino / LEDs and Multiplexing / Re: Super Low Price LPD8806 RGB LED Strips - Want? on: July 17, 2013, 10:10:09 am
Hey guys,

I've sent strips to a few of you. Would you mind posting feedback for others who might be interested in purchasing?

Many thanks!
5  Using Arduino / LEDs and Multiplexing / Re: Super Low Price LPD8806 RGB LED Strips - Want? on: July 03, 2013, 10:41:44 am

I'd like delivery confirmation via UPS.

Since international shipping is relatively expensive, I'd ask you to pick up the shipping, whatever it costs, from New York City.
6  Using Arduino / LEDs and Multiplexing / Re: Super Low Price LPD8806 RGB LED Strips - Want? on: July 01, 2013, 10:13:12 am

Thanks! I hope you enjoy them.
7  Using Arduino / LEDs and Multiplexing / Super Low Price LPD8806 RGB LED Strips - Want? on: June 26, 2013, 12:55:44 pm
Sorry in advance if this post is inappropriate for this forum, but I imagine many users will be thankful to have come across it, because digitally addressable LED strips are not cheap to come by on the internet. Please let me know if it is and I'll take it down.

I bought 250 meters of LED strips from China a few months ago for a big project I was working on. The project ended up changing course, and now I have over two football field lengths of LED strips sitting in my small NY apartment.

I'd really love to get rid of them, and am willing to part with them around the price that I paid for them. There are 50 x 5 meter reels. Price: $80 per reel. Free shipping.

See the specs below. If interested, reply or message me. I can provide more photos and videos of them in action. Thanks!

Digitally addressable
48 RGB LEDs/meter
no plastic casing

These work exactly like the LPD8806 strips seen on adafruit and elsewhere online. I have had zero issues with using them with the LPD8806 arduino libraries that are floating around out there. They're nice and bright, like I would have expected. I think I only ended up opening like 2 of the packages to test with, so 90%+ of them are still fresh in their packaging.
8  Using Arduino / LEDs and Multiplexing / Re: ShiftPWM support topic. Latest update: Schematics, high power LED's, LED strips on: May 01, 2013, 03:00:12 pm

I hope someone has done this before and that there is a simple fix for it.

I have a relatively complex system of about 30 or so library files that I am using for a project. One of those files is a 'master' class, allowing me to keep my actual sketch I load onto my arduino super short, like this:

// sketch
#include "Master.h"

Master myObject;

void setup(){
void loop(){

I would like to include the ShiftPWM library within this system of files. So, I created my own 'Registers.h' file, which would deal with interacting between my own LED objects in my code and the shiftPWM implementation. The top of my 'Registers.h' file looks like this (similar to how my working sketches look):

// Registers.h
const int ShiftPWM_latchPin = 2;
const int ShiftPWM_dataPin  = 4;
const int ShiftPWM_clockPin = 3;
const bool ShiftPWM_invertOutputs = true;
const bool ShiftPWM_balanceLoad = false;
#include "../ShiftPWM/ShiftPWM.h" // this syntax is required to include this library from within a separate folder

When I go to compile the code, I get the following errors:

multiple definitions of '__vector_11'
.../ShiftPWM/ShiftPWM.h:175 first defined here
multiple definitions of 'ShiftPWM'
.../ShiftPWM/ShiftPWM.h:175 first defined here

The line the errors are referring to is:

It seems, from my research, that people get these sorts of errors when two libraries are trying to use the same timer to handle interrupts. A lot of people experience issues when they try to use the Servo and Tone libraries, for instance. But, I don't think that I am defining ShiftPWM twice, and don't understand why my compiler is suggesting that 'ShiftPWM' and '__vector_11' are first defined in the ISR() macro.

I don't get this error when I run the example sketch Elco Jacobs provides with the libraries. I even crafted my own example sketch only using the ShiftPWM library and all works well.

Is there something particular I need to do to be able to #include this library into one of my own? I feel like there has to be a stupid easy fix that I am just not seeing.

Thanks in advance!

9  Using Arduino / Interfacing w/ Software on the Computer / Re: Serial Communication Produces Noise on Breadboard Power Rails on: January 07, 2013, 04:43:11 pm
thanks for the quick reply, billroy.

I added a couple 470 uF caps along the rails and it definitely lowered the amplitude of the noise. I simply attached headphones to the power rails and was able to hear a qualitative difference immediately upon doing so.

But, there is still noise on the rails, which I am guessing I won't fully be able to rid myself of. Luckily the final PCB design won't need serial communication. It's really just for testing at this stage.

So from here I will most likely take in this noise data and attempt to filter it out when I try for a clean signal.

Further suggestions on getting rid of this serial noise are welcomed and appreciated. Thanks!
10  Using Arduino / Interfacing w/ Software on the Computer / Re: Serial Communication Produces Noise on Breadboard Power Rails on: January 07, 2013, 03:48:30 pm
BTW I'm using an ATMega328.
11  Using Arduino / Interfacing w/ Software on the Computer / Serial Communication Produces Noise on Breadboard Power Rails on: January 07, 2013, 03:47:51 pm
I've got my arduino hooked up to my computer via Sparkfun's FT232RL breakout board. I'm using the Arduino IDE's serial monitor to collect audio data.

When serial monitor is not open, the voltage between my power and ground rails on my breadboard is very flat, with no fluctuations.

But, when I open serial monitor, I get noise on the power rails on the order of 400 mV peak-peak. This happens to directly feed into my audio signal, which produces a nasty hiss when I listen to it with headphones.

The 'noise' on the scope is actually a series of pulses about 9 uS apart which decay over the course of 1 uS. I assume this is directly related to the serial activity between my arduino and computer. The behavior also persists on my Arduino Uno board (not implemented on a breadboard), so I don't think it's an issue with my own wiring.

I would like this noise to not affect my audio signal. Has anyone else run into this issue and found an acceptable solution? I am alright with circuit design, although certainly not an expert. Any help would be appreciated. Thanks!
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