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211  Using Arduino / Networking, Protocols, and Devices / Re: Arduino Wifi Shield problems on: October 05, 2012, 09:23:24 am
There is more than one way to connect a laptop to a WiFi shield.
If Ad-hoc doe not woirk, perhaps the Arduion WiFi shield can work as an Access Point (AP) and you can then connect your Laptop to the Arduino (rather than the Arduino th the Laptop).
If that does not work, then you can buy a little pocket router for ~$30 that you run in AP mode and then connect your laptop and the Arduino to.
212  Using Arduino / Networking, Protocols, and Devices / Re: Wifi and Android on: October 05, 2012, 09:18:30 am
It would help if you could provide some more information as to what software on the Android device is going to receive the data. Is it an application that already exists or areyou going to write/code one ?

From there we can determine in what format and with what protocol to send data.
What sensors are you going to connect, and how are you goin to connect the sensors to the analod inputs, digital inputs or through I2C etc.
213  Using Arduino / Networking, Protocols, and Devices / Re: Wifi and Android on: October 03, 2012, 08:37:56 pm
I initially attempted to make my own project work with a Liksprite CuHead, which is a Clone of the Asynclabs WiShield. I got it to work to some degree nut could not progress beyond a certain point, e.g using certain libraries with the CuHead.
Then I tried a Diysandbox.com Hydrogen. Nice and capable product, but in the end I came across the same problem. If you do go the WiFi shield route I'd recommend this one. I have no experience with the Arduino Wifi Shield, which I believe is certainly a very capable piece of hardware nut it will take some time until libraries for it are fully developed and debugged so the maturity of approaches that of the Ethernet Shield.

I finally decided to try using a little WiFi router ( TP-Link WR703n) connected to the Ethernet card and I can assure you that this is dead simple!

The reason is that the WiFi connection is transparent for the Arduino, so you can take advantage of the Full functionality of the Ethernet library and many other libraries that depend on the Ethernet library like DHCP/Bonjour or ArdOSC.

Further more , if someone else less technically inclined wants to reconfigure the network then they can simply reconfigure the little router through its Web interface. No need to hack around in Arduino code, no compilation and upload.
214  Using Arduino / Networking, Protocols, and Devices / Re: Who can make Cuhead wifishield work? Please share your experience on: October 03, 2012, 08:22:05 pm
If I remember it correctly the LED turns red when the shield successfully connects to a router.

As you hae allready discovered the CuHead is not the easiest shield to work with. The CuHead is a clone of the Asynclabs WiShield and the original sources and instructions are still online on the Asycnlabs site.

Perhaps posting some code would help ;-)
215  Using Arduino / Networking, Protocols, and Devices / Re: Moving from Ethernet to WiFi on: October 03, 2012, 08:10:40 pm
I second that statement. However, I'd like to point out that the 703 only comes with a Chinese web interface and there is no firmware available with a different language from the manufacturer.

You could install an OpenWrt on it though.

For sake of simplicity I'd suggest a 702 or a 3020 which in the US are sold with a English Web UI. The 3020 is similar in hardware to the 703 and also can be flashed with OpenWrt, the 702 cannot.

However, if you do get a 703 I've managed to translate the menu points necessary to reconfigure it with the help of Google translate. Not something I'd attempt for frequent reconfiguration ;-)
216  Using Arduino / Networking, Protocols, and Devices / Re: What contributes to the overall I2C Bus length? on: October 03, 2012, 11:35:35 am
Overall capacitance of the sytem, including the nodes. Each device has it's own capacitance, not only the cable.

As Nick already stated it is imortant to dimension the pull-up resistors correctly. the higher the bus speed (Clock Frequency) the more critical these things get.

here's a very nice articlke on the importance of the Pull-up resistors:
http://www.dsscircuits.com/articles/effects-of-varying-i2c-pull-up-resistors.html

Also, you can certainly experiment a lot, however, if you encounter problems, without an oscilloscope you won't really know what your problem is.

Search the forum for "I2C lenght" or "I2C distance". There's some good stuff posted.
217  Using Arduino / Networking, Protocols, and Devices / Re: Working DHCP Server Example (WIZnet/EtherMega) on: October 03, 2012, 11:25:10 am
Same her, please explain better what you want to achive. My suspicion is - given your own statement that you don't have networking experience - you are looking at this a bit backwards ;-)

The devices most commonly runnig DHCP servers are routers that sit somewhat in the middle of everything and route IP packets to their approproate destination. These destinations are usually End-devices (for lack of a better name) like an Arduino. There are libraries the implement DHCP clients on an Arduino.
218  Using Arduino / Networking, Protocols, and Devices / Re: Arduino ethernet shield w 5100 and wifi network on: October 03, 2012, 11:17:32 am
To control something as simple as Air Conditioning units you may want to use a different approach than WiFi.
Maybe X-Bee RF.
219  Using Arduino / Networking, Protocols, and Devices / Re: Arduino WiFi Shield UDP Support on: October 02, 2012, 11:29:55 am
@mamaretti

What OSC library are you going to use, or are you going to write one yourself ?
If you intend to use ArdOSC currently no WiFi shield supports this library out-of-the-box.

ArdOSC uses some low level functions of the Ethernet library that "talk" directly to teh Wiznet W5100c chip on the Arduino Ethernet card. You'd have to rewrite that portion and adaptit to the specific hardware your WiFi shield uses.

If you are interested in an alternative solution I'll PM you so we don't hijack this thread ;-)
220  Using Arduino / Networking, Protocols, and Devices / Re: W5100 ethernet shield on: October 02, 2012, 11:23:01 am
Yup, that works.

Or these:

http://www.saelig.com/BRD/ETH042.htm

http://www.saelig.com/BRD/BRD032.htm
221  Using Arduino / Networking, Protocols, and Devices / Re: Arduino ethernet shield w 5100 and wifi network on: October 02, 2012, 11:18:42 am
You could use a little WiFi router that you can cponnect directly to the Ethernet card that you already have.
Here in the US you ca get a TP-Link TL WR702n (or 702 or 3020......) viia a short Ethernet cable directly to the Ethenet card.
Then you can connect that in client (bridge) mode to the Modem-Router.

this is less expensive than buying a separate WiFi shieled and simple to set up without the need to re-write code.
222  Using Arduino / Networking, Protocols, and Devices / Re: Suggestion for a WiFi system on: September 30, 2012, 01:10:18 pm
The 703 and 702 use a standard USB wal wart, that accepts a standard USB cable. The output power is 5V, 1A.
That of course does not mean that this mini router is drawing one amp.

See this link http://wiki.openwrt.org/toh/tp-link/tl-wr703n

Looks like, in standard mode it uses around 100mA. BTW, Dude, that information took me less than a minute to find using google here from my iPad. Information at your finger tips ;-)
223  Using Arduino / Networking, Protocols, and Devices / Re: Suggestion for a WiFi system on: September 29, 2012, 01:06:18 pm
I have. That is how these routers are operated in my projects.
224  Using Arduino / Networking, Protocols, and Devices / Re: Suggestion for a WiFi system on: September 28, 2012, 09:18:30 pm
The reason I initially suggested these routers is that the are very small. Twice the thickness of an iPhone 4 but half the footprint. Also you can supply the routers power directly from the Arduino as these routers use USB power = 5V.

Also, here in the US the 702 ( not the 703) comes with an English interface. If you buy it through eBay and someone sends it from Hongkong then obviously the chances that you may have a Chinese interface on the 702 are higher.

Routers with external antennas tend to be bigger but really any router that has a bridge- like mode would work.

225  Using Arduino / Networking, Protocols, and Devices / Re: Soft I2C library compatability on: September 25, 2012, 05:51:11 am
Go get yourself a Digispark:

http://www.kickstarter.com/projects/digistump/digispark-the-tiny-arduino-enabled-usb-dev-board

http://digistump.com/#digispark

It employs a Attint85 and plugs into a USB cable.
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