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16  Using Arduino / General Electronics / Re: EL Escudo on: July 05, 2011, 11:11:34 am
Link: EL Escudo

I seem to recall in a similar configuration as you describe a ground connection needed to be made.

Have you read the comments on the product page? A number of people described what worked for them.

17  Using Arduino / Microcontrollers / Re: Android on: June 29, 2011, 11:12:13 am
Is it possible to communicate with arduino over an android tablet?

I've had success with an Android 2.3.4 phone (the Nexus One) using the USB Host Shield library as mentioned (and created!) by @felis.

I created the Handbag project as a way to get started more easily. It allows you to do all the "work" on your Arduino and just display the user interface (created on the Ardiuno) using a pre-made Android application.

So you could use your Arduino to read the RFID tag, update the display and then move the motors when an item is selected on the display.

18  General Category / General Discussion / Re: Android and Arduino on: June 29, 2011, 11:05:27 am
2) do i have to write a firmware for the arduino board. I guess I can run arduino demo program and see what happened.

If you're looking for an easy way to get started you might like to take a look at my post on the Handbag project which is an easy way to create Android USB accessories without needing to write Android code.

19  Community / Exhibition / Gallery / Dual-screen Nexus One phone Android accessory on: June 29, 2011, 11:01:10 am
Always running out of space on your Nexus One phone's display?

Wish you could see who was texting you or know the current time when you're playing full-screen games?

You need a dual-screen Nexus One:

The project hardware includes an Arduino, USB Host Shield, LCD display and a Nexus One phone running Android 2.3.4.

The LCD display accessory is implemented using the Android Open Accessory Protocol (like the ADK): an invisible background service is started automatically when you connect the accessory. The service displays a notification of the accessory found, listens for new text messages and starts sending the current time to the accessory for display. You can use your phone as normal while the service is running in the background.

More details, source and photos on my Labradoc project log.


P.S. If you want to get started with creating Android accessories but don't know how to write Android code check out my post on Handbag it's the easy way to get started without writing Android code.
20  Topics / Device Hacking / Create Arduino Android accessories without writing Android code with Handbag... on: June 29, 2011, 10:32:25 am

If you're interested in creating accessories for Android and the Open Accessory Protocol but don't have experience with developing Android apps then Handbag is for you:

If you can write a sketch for your Arduino, you can accessorize your Android with Handbag:

    Handbag.addLabel("Hello, World!", 20);
    Handbag.addButton("LED on/off", buttonCallback);

Handbag consists of an Arduino library and an app installed on your compatible Android device. (Requires Android 2.3.4 or 3.1 and the USB Host Shield.)

The library comes with a number of examples to help you get started including a "multimeter" demo:

Try it out and let me know what you think!


21  Using Arduino / Microcontrollers / Re: ChipKit (UNO32) shield compatibility matrix on: May 23, 2011, 10:05:25 pm
With an external 8Mhz crystal you can run it 40Mhz, 64Mhz, 80Mhz and some more speeds in between
How many clock cycles per instruction?
22  General Category / General Discussion / Re: Chaos Communication Camp on: May 17, 2011, 11:13:16 am
I went to CCC a couple of years ago and really enjoyed it. I'd like to find my way back again sometime. smiley

When I was there, there seemed to be a reasonable amount of interest in hardware--quadrocopters were just starting to get big at the time.

In terms of hands-on geekery it seemed a lot more round-the-clock than an event like DEFCON in the US. I've been to both and DEFCON seems to be a lot more about the parties in the evenings. I'd suggest you look at the schedule and videos and see what appeals.

I didn't know anyone at CCC when I arrived and didn't speak German but volunteered to help setup the day before opening and meet some nice people who helped take care of the visitor from the other side of the world. smiley It's probably fun if you find friends to go with too. I'm not sure if your age would be an issue or not for getting admittance.

Another option you might want to consider is the Chaos Communication Camp that's scheduled for this year as well--but you'd have much less time to save:
23  Forum 2005-2010 (read only) / Troubleshooting / Re: Establishing Serial Connection with LCD Smarti on: March 26, 2008, 03:41:30 am
LOL, I was going to suggest this article but I see you've already been there. :-)

24  Forum 2005-2010 (read only) / Troubleshooting / Re: Fixed the problem of compiling UsbKeyboard in 0018 on: December 22, 2010, 08:05:12 am
I'm having some trouble getting UsbKeyboard to work (Device not recognized).
Have you tried it on a different USB port, different operating system and/or computer?

I'm using version 5 of the library with Arduino IDE 21. I'm using the schematic from .  But I'm guessing this schematic may be out of date?
No, that schematic should be okay.

And all of the documentation constantly links this site, which is down -

Yeah. smiley-sad

25  Forum 2005-2010 (read only) / Troubleshooting / Re: Fixed the problem of compiling UsbKeyboard in 0018 on: October 18, 2010, 07:09:32 am
For people who are still following this I have finally updated the library to (a) fix the bug mentioned above and (b) work with the ATmega328.

The library also now has a new home with a public source repository and downloads available:
26  Forum 2005-2010 (read only) / Troubleshooting / Re: Serial Port Already in Use - MacOSX leopard on: March 12, 2009, 07:16:24 am
follower, when i type those in terminal, says i need a password...?
Yes, it will ask you for your administrator password. You should only run the commands above with administrator rights if you trust me or independently verify what the commands do to your satisfaction.

27  Forum 2005-2010 (read only) / Troubleshooting / Re: Serial Port Already in Use - MacOSX leopard on: March 10, 2009, 10:01:49 am
I can confirm that for arduinio-0013 after I downloaded & installed an rxtx alternative library I needed to do the following in the terminal to get it to work:

$ sudo mkdir /var/lock
$ sudo chmod 777 /var/lock

I cannot comment on the security implications of doing so.


P.S. This still doesn't explain why the original library seems to work with 0012 but not 0013.
28  Forum 2005-2010 (read only) / Troubleshooting / Re: Need help getting Arduino to send email on: February 27, 2009, 07:51:02 am
The arduino cannot do TLS or SSL.  Those are too much to expect from an 8 bit microcontroller.  (Of course as soon as I say that, follower will find an example of someone who has already done it. :-) )
Is that going to be your new game? :-)

The closest I've discovered in my wanderings are the SHA-1 and HMAC-SHA-1 implementations I linked to from my Arduino and IRC page.

29  Forum 2005-2010 (read only) / Troubleshooting / Re: Need help getting Arduino to send email on: February 26, 2009, 05:21:32 am
You need to work out how to keep reading characters sent from the server until it stops sending them.

30  Forum 2005-2010 (read only) / Troubleshooting / Re: Need help getting Arduino to send email on: February 25, 2009, 02:31:34 am
Protocols like this are text based, so--for example--when you have a web client connect it sends some text to make a request for a URL and receives a text response which it must then read and interpret.

You want to find out to which port you need to connect to make a SMTP connection and then what text you need to send and receive in order to send your email.

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