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196  Using Arduino / Networking, Protocols, and Devices / Re: Copperhead v2 wifi shield. Basic help request! on: December 08, 2012, 11:16:18 pm
What "WiFi" library exactly are you using ?
The LinkSprite CuHead is a clone/copy of the WiShield from AsyncLabs. AsyncLabs closed their doors but the library can still be loaded down from their site.
197  Using Arduino / LEDs and Multiplexing / Re: A Low Cost Approach to Graphical Waterfall on: November 22, 2012, 09:06:53 pm
Very interesting project!

I'd agree with the assessment that the long thin hoses right at the outlet of the solenoid valves absolutely kill the whole idea. What you are trying to achieve with the hopefully very fast solenoid valves is essentially a pulse width modulated signal. The hoses work like a capacitor of sorts, filtering your nice clean signal edges.

Once you've done that it may still not work as you may need more height than a door to form a pattern.

Also a dark background and some back lighting ore better strong side lighting (perhaps recessed in the door frames) would make these water lines more visible.
198  Using Arduino / Networking, Protocols, and Devices / Re: Xbee Wifi iPhone on: November 15, 2012, 06:33:55 pm
You'd have to share far more information about your project if you expect any appreciable help.

Of course that sounds entirely possible, but the devil is often in the details. So more details are called for  smiley-wink
199  Using Arduino / Networking, Protocols, and Devices / Re: Camera + WiFi on: November 15, 2012, 06:30:49 pm
Having 20 years of experience in semi and fully automated factory automation systems I'd have to agree with pylon. Image processing, especially with these requirements is far to resource demanding to be done on an Arduino.
200  Using Arduino / Networking, Protocols, and Devices / Re: Need notification sent from arduino to phone on: November 14, 2012, 08:23:09 pm
You're welcome. BTW I can guarantee you that I know how it feels to finally have an idea for a solution.

My LED lighting system ( was min dire need of a remote control solution. I hade something working with a WiShield and Ardumote but ran against several obstacles that prevented me from developing the solution any further.
Then the Arduino WiFi shield was announced but did not happen for over a A year. It took half a year for to come across a video on YouTube showcasing exactly this router solution and I slapped myself of the forehead having missed this obvious solution. My system now is remotely controlled using TouchOSC from my iPhone. Smooth!
201  Using Arduino / Networking, Protocols, and Devices / Re: Need notification sent from arduino to phone on: November 14, 2012, 07:49:10 pm
If you get this to work with the " standard" Ethernet shield, then you can simply connect a little pocket router like this

To the Ethernet shield. That way you can use UDP through the Ethernet shield and use Ardumote on the iPhone. You can connect to the little router with your iPhone directly by running the router in AP mode.
202  Using Arduino / Networking, Protocols, and Devices / Re: I2C protocol problem on: November 13, 2012, 06:18:05 am
A link to the sensors data sheet would help ;-)
203  Using Arduino / Networking, Protocols, and Devices / Re: Simultaneous SPI and I2C communication on: November 11, 2012, 09:36:56 am
Please post you complete code and not just snippets. Also, please use the code tags
code tag

This will very much improve the codes readability on the forum.
204  Using Arduino / LEDs and Multiplexing / Re: Power Leds 101 for begineers on: November 08, 2012, 08:03:58 pm
Most high power LEDs are first reflow soldered to a mcpcb ( metal core printed circuit board ). That mcpcb while itself being a form of a heat sink, is usually too small to dissipate the heat of a 700mA LED. Thus, that mcpcb with the LED then is mounted to a bigger heat sink either with thermal epoxy, thermal tape or thermal paste and screws.

Reflow soldering this LED " in the raw" to an mcpcb takes some form of equipment that most beginners don't have on hand, or experience with.

If you are interested in that specific LED, perhaps look for a supplier that has this mounted already on a mcpcb.

Here for example:
205  Using Arduino / Networking, Protocols, and Devices / Re: pull-up resistors for the I2C connection on: November 01, 2012, 03:34:40 pm
@ oric_dan

Thanks for that bit of information. Thsi has never crossed my mind and may actually explain a problem I had in one of my projects!
206  Using Arduino / Networking, Protocols, and Devices / Re: pull-up resistors for the I2C connection on: November 01, 2012, 11:13:21 am
This is a very interesting articel of the effects of these pull-up resistors on the I2C signal.
207  Using Arduino / LEDs and Multiplexing / Re: Best high Power RGB Led on: October 27, 2012, 07:28:19 pm
Aside from the impossibility of displaying the EXACT color as another device/ screen, how would you specify " not too expensive" and particularly " Arduino compatible" ?
208  Using Arduino / LEDs and Multiplexing / Re: RGB effects/patterns, help needed with switch cases on: October 20, 2012, 01:37:02 pm
Judging by your code I guess your are trying to fade all LEDs in the LED strip at once ?

A very efficient method to change all three colors at the same time ( well...mor or less) is to implement a 3D bresenham algorithm. Think of it as drawing a line trough a rasterized 3D space with the three coordinates not being x, y and z but red, green and blue.

With that being your base algorithm, you can simply fade between any given color mix. You define two points and the algorithm draws the line resulting in smooth fading between the two ( color)points.

If that's what you a looking for, I've implemented it in my LED lighting systems and I'd be glad to share. It's still quite work in progress but works nicely as is already.
209  Using Arduino / Networking, Protocols, and Devices / Re: serial over ethernet? on: October 17, 2012, 07:59:35 pm
The reason your sketch generates such a large binary is simply that the protocols you are using are quite "fat. If you just want to read a stream of sensor data then raw UDP is a much better and faster way to do it.

Perhaps a more detailed explanation would provide more guidance of help. I agree that "secure" as in encrypted is rather out of the question on say an Uno or a Leonaro.

Tere have been several Arduino compatible 32 bit ARM Cortex boards released lately that may be able to do that. The Teensy 3 might be a candidate or the Galago.
210  Using Arduino / Networking, Protocols, and Devices / Re: WiFi Shield with Phone Application on: October 15, 2012, 04:28:00 pm
No, WiFi is not hard to do. If you use a little router connected to the Ethernet shield, for example a TP-Link TN Wr702n it is very simple. This is a little travel router that comes configured as an AP ( Access Point, or Hotspot). You can integrate it also into an existing network if you so desire.

You should be able to use any WiFi enabled phone to connect to it. I can verify that it works with an iPhone and iPad.

Once connected, or should be able to run any of the sample scripts that come with the Ethernet library and they should run without problems. The WiFi connection is transparent to the Ethernet shield.
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