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61  Using Arduino / Networking, Protocols, and Devices / Re: How to control LED's on arduino thru Wifi Shield connected to iphone hotspot? on: August 15, 2013, 05:43:51 pm
I'd ditch ( sell to another unsuspecting newbie that just has to have a WiFi shield) the WiFi shield, use an Ethernet Shield and use ArdOSC in combination with TouchOSC. I've done this using a Teensy++2 with a WIZ812mj Ethernet module ( has the same Ethernet W5100 chip that the Ethernet Shield uses) connected to ta little TP-Link WN703n or 702 pocket WiFi router

I am currently moving over to the Teensy3 in conjunction with the WIZ820io and away from ArdOSC to the OSC library from CNMAT

The beauty of this is that you can use a lot of the libraries that were written to work with the Ethernet shield and still get full WiFi functionality. Actually you get much better functionality as a commercially sold WiFi router is easy to set up through the web interface ( the 703 interface is Chinese, the 702 is in English).
62  Using Arduino / Networking, Protocols, and Devices / Re: A working alternative Wifi to RN131C from Sparkfun on: August 11, 2013, 07:55:34 am
Many WiFi shields suffer from the same problem that is proper software support.
I'd suggest to use a "standard" Arduino Ethernet Shield and connect it to a WiFi pocket router like the TP- Link WR704n, WR702n or MR3020.
These routers have a web interface for configuration, and run in AP or Brige/Client mode and you'll have them set up quickly. On the Arduino side you can use the mature Ethernet library and all the code samples without having to mess around with another WiFi shields API
63  Using Arduino / Networking, Protocols, and Devices / Re: dont know where to start with... on: August 09, 2013, 06:07:49 am
I think zoomcat's suggestion is the best option for a "WiFi" solution. Tried and proven.
Using an Ethernet shield, has the advantage that you can use the mature Ethernet library and there are a lot of libraries that rely on the Ethernet library.
If you need higher speed then you could use an Embedded Ethernet Module with the W5200 ethernet chip like th WIZ820io, which is much faster than the W5100 on the Ethernet Shield. It requires a slightly modified Ethernet library, however.
If you want it to be small then instead of the Due you could use a Teensy3 combined with a WIZ820io on an adapter board
64  Using Arduino / Networking, Protocols, and Devices / Re: I2C communications on: August 03, 2013, 08:17:56 pm
Please add code tags to you post so the code is easier to read.
65  Using Arduino / LEDs and Multiplexing / Re: Increasing Brightness Linearly on: July 30, 2013, 06:57:00 pm
The logarithmic curve is only a relatively coarse approximation. More accurate is the CIE LAB correction:

This post on the forum explains how to calculate a lookup table:,147810.0.html

You may want to check out "progmem":
66  Using Arduino / LEDs and Multiplexing / Re: hooking up a couple rgb's on: July 19, 2013, 07:56:59 pm
The link you provide also hosts the spec sheet for the driver. These are essential to understand what you can do with a driver. Driver spec sheets often show several examples of schematics as does the one in you link. Sometimes there are even more specific application  notes for demo boards for these drivers. That will tell you what components are needed.
As crossroads has already stated, for a first project a ball grid component is not advisable whatsoever. go find yourself a suitable driver, perhaps in nothing smaller than a TSSOP package as that can still be bad soldered - although that takes some skill. Try to understand the data sheet, google for terminology in the data sheet that you don't understand and then come back if you have questions. There is am awesome world of information out there particularly for LED technology and it's right at your finger tips ;-)
67  Topics / Device Hacking / Re: ArudinoPhone, A touch screen phone make with Arduino. on: July 18, 2013, 05:54:07 am
Very cool project!
68  Using Arduino / Networking, Protocols, and Devices / Re: controlling arduino by ios device wirelessly on: July 18, 2013, 05:41:51 am
There is a lot of confusing language in your last post!

For wanting to make a commercial device you need to proceed from having an mere idea to having a working concept that defines the mechanical, electrical  and software interfaces between these main parts.

The Arduino TFT shield, for example communicates with an Arduino through the SPI. That is an entirely different thing than HDMI.

How would eliminating the WiFi, or Bluetooth shield and replacing that with an Android device more worthy ?

69  Using Arduino / Networking, Protocols, and Devices / Re: controlling arduino by ios device wirelessly on: July 17, 2013, 05:41:31 am
You don't need a WiFi shield to do WiFi with an Arduino.
A working set-up is for example an Ardino UNO equipped with an official Ethernet shield ( more specifically with a W5100 Ethernet chip) and a little pocket route connected to the Ethenrnet shield.

I've used this and similar set-ups in several projects. The above is the standard that works to of the box with Aruino.

I am using a Teensy++2 with a WIZ812MJ in one project and recently designed what I jokingly call a Frankenduino that combines a Teensy3 with a WIZ820io ( with a W5200).

Not only is this less expensive overall compared to the original Arduino WiFi shield but also much faster to get to work. A commercial pocket router like the TP-Link TL WR702n router comes with a self explanatory web interface that allows you to configure the router quickly either as an AP or in client mode and you can do that from your iPhone without having to open and program Arduino code.
AFAIK No WiFi shield offers that!
70  Development / Other Software Development / Arduino Eclipse plugin - New Version on: July 13, 2013, 04:16:29 pm
Jantje has released a new version of the Arduino Eclipse Plugin that works with the Arduino 1.5.2 beta IDE and supports the Arduino Due, as well as the Teensy, Teensy++ and Arm Cortex M4 32bit based Teensy3 microcontroller boards.

I have written some Installation instructions for Mac OSX, but other than file/folder locations and perhaps OS specific differences in the Eclipse UI there are no Mac specific things in these instructions so they should work for Linux and Windows users as well. Look here in the "Teensy, Arduino etc." section :
71  Using Arduino / Interfacing w/ Software on the Computer / Re: Importing Arduino sketches to Eclipse (C/C++) on: July 13, 2013, 04:05:43 pm
Or in fact much better yet, use the Arduino Eclipse plugin. Newest version is
Installation instructions are here under "Teensy, Arduino, Etc." :
72  Using Arduino / LEDs and Multiplexing / Re: How to drive high power LEDs on: July 13, 2013, 03:49:36 pm
What exactly would be wrong with the external MOSFETs ?

I mean aside from the fact that I believe designing a proper board seems may be a skill the OP yet has to acquire. OTOH that is not soooo difficult. Many of the spec sheets for LED driver chips provide very good application examples and sometimes there are additional App notes with designs for demo boards.
73  Using Arduino / LEDs and Multiplexing / Re: How to drive high power LEDs on: July 10, 2013, 09:50:43 pm
You need to control these with a switched constant current power supply.
The very low resistor value you calculated is based on a fixed forward voltage. As the LED heats up that forward voltage is going to change and you would need quite a different resistor. Other wise due to the changed forward voltage a higher forward current would flow.
As you can see in the spec sheet at higher forward currents, higher forward voltages result. And so on....

As fungus has already indicated, you will need a very substantial heat sink. There are online calculators that will help you with calculations and define what heatsink will be required.

Perhaps provide more details as to what you are trying to achieve. These LEDs you linked to are monsters and I am wondering if that lumen output is really needed.
74  Using Arduino / Microcontrollers / Re: Arduino Due - issue on: July 07, 2013, 09:21:13 pm
You may want to update to the latest ( V2.1.0.4 released last week) version of the Arduino Eclipse plugin. That may remedy some problems.
75  Using Arduino / Interfacing w/ Software on the Computer / Re: arduino Eclipse MAC and Windows on: July 07, 2013, 09:17:33 pm
I am not exactly sure what you are trying to do but...

If you want to run Eclipse to compile Arduino code then there is no better way of doing that than the newest V2.1.0.4 version of the Arduino Eclipse plugin:

I've written some installation instructions:
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