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121  Using Arduino / Networking, Protocols, and Devices / Re: Arduino - Wifi - iPhone on: February 19, 2013, 07:56:41 pm
Perhaps because you cannot connect an iPhone to an Ethernet cable, unless ther is some form of an adapter that I am not aware of.

I agree with Pauls, however, that using a WiFi shield is not nearly as trouble free as an Ethenet shield.
However there is a solution that is almost as trouble free alas at a little added expense.
You can connect a little pocket router Tp- Link WR703n etc, to the Ethenet shield and voila, you're in WiFi business.
122  Using Arduino / Networking, Protocols, and Devices / Re: Wifi connection???????? on: February 19, 2013, 05:02:43 am
The Wireless SD shield is not a WiFi shield. WiFi is not the same as Wireless.
The Ardino Wirless SD shield needs to be equipped with an XBee wireless module. You did not mention what module is installed only the shield.
Whatever you do have installed however I'd believe makes no difference. The library you are referencing is meant for the specific wifi hardware on the Arduino WiFi shield and will not work with the Wireless SD shield.

Please put your code in code tags when posting!
123  Using Arduino / Networking, Protocols, and Devices / Re: pass caps for the nRF24L01 on: February 18, 2013, 10:04:51 pm
To answer one of your question, the smaller cap needs to sit closer to the radio. These capacitors are needed to filter out noise on the power supply side and have not much to do with the 2.4GHz side as Docedison mentioned.

That does not need to be on a spec sheet as adding decoupling caps is very common practice ( as Docedison also mentioned) and one of the very first things I learned ( the hard way :-) when I started with electronics 20+ years ago. That is not specific to these transceivers!
124  Using Arduino / Networking, Protocols, and Devices / Re: Wifi connection???????? on: February 18, 2013, 09:55:36 pm
When asking for help, please consider to provide as much information as you can with the minimum being:

- Links to the exact hardware specs that you are using
- the code/ sketch that you intend on running on your Arduino

And please put the code in code tags so its actually readable. Without that minimum we cannot really provide much help!
125  Using Arduino / LEDs and Multiplexing / Re: Hardware Help - Automotive LEDs on: February 16, 2013, 12:20:56 pm
It would probably help you if you scan through the many posts in the LED section of this forum.
The first thing you'll learn is that running LEDs in a parallel configuration is not good practice as LEDs are constant current devices. that also means that you need tight current control, and not voltage control.

Automotive applications can be challenging as the voltage/and current levels are quite varying and most automotive LED chips are buck/boost LED drivers for that very reason.  Also, you may want to check what laws apply in your country of residence. You may get away with tinkering around with these things in the USA, however, in Germany the police woud remove you vehicle from the streets immediately and you'd be heavily fined for tinkering around with elements on tha car that are considered safety relevant.

I am not suggesting not do it, however, I think for a first Arduino project you may have bitten off a little more that you can chew. Perhaps you want to start with something less complex that will have a better chance of success and keeping you motivated for the more challenging project you have in mind.
126  Using Arduino / Programming Questions / Re: Using other IDEs to develop on: February 13, 2013, 07:49:26 pm
If you're familiar with Eclipse your can try to use the Arduino Eclipse plugin:

There a a few lengthy threads about it here on the forum. I've started using a beta version with my Teensy++2 board and it works nicely for me.
127  Using Arduino / Networking, Protocols, and Devices / Re: serial to osc on: February 04, 2013, 07:03:53 pm
If this is the most convenient way I cannot answer, however, you can sent OSC directly from an Arduino Board to a PC via ArdOSC.

You need to equip your Arduino with an Ethernet card as OSC uses the UDP protocol.
You can also do this per WiFi by connecting a little pocket router o the Ethernet Shield. ive done this in two set- ups. While you may be tempted to use a WiFi shield, don't do it!
I believe the only WiFi shield this may work with is the WiFly from Sparkfun.
128  Using Arduino / Networking, Protocols, and Devices / Re: Is I2C the best way to mix different speeds and voltages ? on: February 02, 2013, 08:30:02 am
If I remember correctly your can have 119 devices on the I2C bus. Some suggest its 128 but a good number of the addresses are reserved. Then of course not every I2C device allows to freely set its address. In case of address conflicts you may need to use a multiplexer.

Nick Gammons website is a very good resource for I2C " stuff" ( amongst many other things).
129  Using Arduino / Networking, Protocols, and Devices / Re: Diamondback with official Arduino WiFi Shield Library on: February 01, 2013, 05:44:19 pm
I seriously doubt that as the two shields use Ethernet modules from different manufacturers. The Diamondback uses a Microchip Ethernet module and the official Arduino WiFi shield uses the HDG104 from H&D wireless and has an on board processor.
130  Topics / Interactive Art / Re: Stage Design application on: January 31, 2013, 08:31:00 pm
Very well executed! Outstanding!
I really like it when these projects have a finished look and are not just cobbled together.
131  Using Arduino / Project Guidance / Re: arduino wifi shield on: January 31, 2013, 07:50:36 pm
This one is pretty nice and available. It shares a "feature" with several other WiFi shields - it's expensive ;-)
132  Using Arduino / Project Guidance / Re: Help! AMBX RGB LED light extension project! on: January 30, 2013, 07:14:26 am
This should actually be pretty simple.  You only need to sense voltage on the AMBX LED circuits and drive the appropriate "extension" LEDS.  In fact, it could be pretty easily done without any sort of microcontroller (arduino or otherwise), if you only want to match color for color.  Handle the power with a v-reg/voltage divider circuit (with current limiting resistors) and use some transistors to drive the new LEDs.  I'm no EE but I think that should work smiley.  Someone please correct me if I'm missing something. 

You want to power this whole thing from the AMBX board?  My main concern with that would be having enough available current.  If you are willing to use an external power supply things get much more simple since you can just buy one that gives you the output you want. 
Sensing the voltage drop across an LED serves relatively little purpose. LEDs are constant curt devices with a voltage drop ( called forward Voltage Vf) varying with changing junction temperature. You would need to measure the current through the LEDs. Or actually much better the duty cycle of the PWM signal controlling the brightness of the LEDs. Even that is not soo interesting. Finding out what the little chip does that sits on the PCB would be the real key to reverse engineer this circuit and will likely provide you with access what the software does that controls these lights.
133  Using Arduino / Project Guidance / Re: Advice on Arduino High Output LED Driver Shield on: January 29, 2013, 06:46:03 am
To address the thermal issues, looking at the data sheet it looks to me that the chip has a thermal pad underneath that will have to be reflow solders to the PCB to help dissipate heat. It is relatively common for high power LED drivers. The LT3496 we are using on our LED shield requires the same. In order to spread the heat over a bigger surface you need to likely place thermal vias in that area under the chip as well. If that still is not enough you may want to look at a PCP with 2oz copper thickness.
However, given the abilities of the chip you are using I'd assume you are looking more for a low cost solution, thus I'd suggest staying away from 2oz PCBs as these a rather expensive and not available from the usual low volume PCB houses e.g. batch PCP or OSH Park.

I am also wondering why you are looking at such high PWM frequencies. While the chip you are using has a low dimming ratio already ( 1% duty cycle resolution or 100:1), using such high PWM frequencies is not going to help that at all, unless the aim is to use as small as possible components, but in that case there is plenty of room on a Arduino shield ;-)
134  Using Arduino / Project Guidance / Re: RGB LED Matrix spread over 400 square feet (43 square meters) on: January 29, 2013, 06:18:51 am
What would be the viewing distance and viewing angle or in other words would the LED panel be installed vertically ?
What are the viewing environment be dark and indoors or outside in bright daylight ?

The above at a minimum will determine what output your light sources will need to generate.

Given the size of the project one could easily assume that you won't get away with small 20mA LEDs but need something that has more light output. Of course your project is technically feasible. That is really not the question!

The question really is what are your time and budget constraints ?
135  Using Arduino / LEDs and Multiplexing / Re: RGB SMT LED Cube, resistors, drivers, and shift registers. on: January 27, 2013, 08:34:49 am
For decoupling you usually need one larger cap, for example 47uH, and smaller caps for each chip involved with usual values ranging from 0.1uF to 0.01uF. The latter ones are for the high frequelncy noise and should be located as close as practically possible to the ICs.

Here's an excellent tutorial on it:

I order most of my components from places like Mouser, Digikey and Newark and they ship rapidly. Of course it depends on ones particular location but my things usually arrive within 3-4 days.
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