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1  Community / Exhibition / Gallery / Simple software defined radio on: October 13, 2013, 06:00:34 pm
http://codinglab.blogspot.be/2013/10/software-defined-fm-radio-transmitter.html

Enjoy!
2  Community / Exhibition / Gallery / Re: XOscillo shows your heartbeat wave (ECG) on: July 14, 2013, 09:35:47 am
Thanks!
3  Community / Exhibition / Gallery / Re: Arduino Micro Incorporated in Guitar Amp PCB on: July 07, 2013, 06:58:06 am
Why do you need the Arduino?
4  Community / Exhibition / Gallery / XOscillo shows your heartbeat wave (ECG) on: July 05, 2013, 06:16:14 am
I used xoscillo (A software that turns your arduino into a simple oscilloscope) with some extra components and turned it into an ECG (Electro cardiogram) machine

ECG:
 http://codinglab.blogspot.be/2013/07/my-heartbeat.html

Xoscillo:
 https://code.google.com/p/xoscillo/

Enjoy!
5  Community / Exhibition / Gallery / Virtual hard disk for an old school computer on: January 17, 2013, 12:17:46 pm
All the details are here, I hope you like it!

http://codinglab.blogspot.be/2013/01/virtual-msx-disk-drive.html
6  Forum 2005-2010 (read only) / Interfacing / reading nunchuck in a way that I havent seen bfore on: October 04, 2009, 03:17:03 pm
Hi,

I am treating the nunchuck as if it was a I2C serial eeprom, I am reading from the device 0xa4 and from the address 0x0000, and it just works!

What I noticed is that reading the data this way is:

- Data is not encrypted,
- no need to send a zero to get more data,
        just keep reading chunks of 8 bytes and you'll get new readings
- no need to put any delays anywhere

So what is the deal here? Documentation and samples say a whole different thing

this is my code:

void PrintNunchuck()
{
      char temp[6];
      SetEpromAddress16( 0xa4, 0x0000 );
      ReadFromEprom( 6, (unsigned char*)&temp);
      for (char i=0;i<6;i++)
      {
            PrintHex8( temp );
      }
}

Any idea what is going on?
thanks!!
xchip
7  Forum 2005-2010 (read only) / Interfacing / Re: Sheilds on: October 05, 2009, 05:18:15 am
I agree with Fjornir, there is no excuse for not having googled "arduino shields" :-)

8  Forum 2005-2010 (read only) / Interfacing / Re: Has anyone used the WiFly Serial Module? on: October 04, 2009, 05:05:06 pm
check out my blog, I am using an NDS to control stepper motors , use an optical mouse as a low red camera... etc

http://codinglab.blogspot.com/2008_04_01_archive.html

I have an old nds, no camera, as soon as I get one I will add an extension to my LUA interpreter

xchip
9  Forum 2005-2010 (read only) / Interfacing / Re: Has anyone used the WiFly Serial Module? on: October 04, 2009, 03:46:22 pm

If you are reaching a point where you need to use wifi, why don't you switch to a different platform more suitable for those purposes?

I use a NintendoDS for the wifi, I have a nice touch screen, I can play audio, and then I connect it to a silly 8051 to do the I/O, PWM and other things....  

I dont need to compile my code because all is done in LUA, a light scripting language, and I update the code though a webserver I have in the nintendo...

my 2cents
xchip
10  Forum 2005-2010 (read only) / Exhibition / Re: arduino oscilloscope, a nice one :-) on: October 13, 2010, 06:04:47 am
new and pretty version available!

Just in case you missed it smiley

link https://code.google.com/p/xoscillo/
11  Forum 2005-2010 (read only) / Exhibition / Re: arduino oscilloscope, a nice one :-) on: October 12, 2010, 07:18:54 pm
BTW I updated the source code with the latest improvements to get higher sample rates.

I'd be nice if someone could test them to double check. If all goes well I'll update the release.

Thanks!
12  Forum 2005-2010 (read only) / Exhibition / Re: arduino oscilloscope, a nice one :-) on: October 12, 2010, 07:16:12 pm
Hey the command for reading teh serial is very fast and it doesn't cause a big delay, but anyway please feel free to try your approach and see what happens though! :-)

13  Forum 2005-2010 (read only) / Exhibition / Re: arduino oscilloscope, a nice one :-) on: October 10, 2010, 06:19:19 am
Hey I am a bit busy right now with real life but I'll be back soon :-)

Feel free to change the arduino code in the way you think it will work best and if so well add your changes to the xoscillo codebase.

Sending data only when it changes is a good idea, the problem is that data is changing all the time, the interrupt would be triggered continuously and this would be a big slowdown... what you mention would be good if the signal was to change slowly or remain constant for long periods of time, which is not the typical case.

14  Forum 2005-2010 (read only) / Exhibition / Re: arduino oscilloscope, a nice one :-) on: October 02, 2010, 01:43:03 pm
Ok, I got the arduino to send data at 10,000,000 bauds/sec that means it will be able to sample higher frequencies.. So far the theoretical maximum is 28Khz, although in the practice we could say it's 10Khz since you need a few samples per wavelength.

Credits! I am getting such a speed up thanks to Kiril's post
http://www.arduino.cc/cgi-bin/yabb2/YaBB.pl?num=1242466935/0

It requires replacing the slowly arduino serial files by his, which are way better!

I still need to check if I can get the ADC to work faster since I think this is what limiting the throughput...


Ok, it's sat night, and its party time! Stay tuned for the release! ;-)
15  Forum 2005-2010 (read only) / Exhibition / Re: arduino oscilloscope, a nice one :-) on: October 02, 2010, 11:14:51 am
Awesome! At least is usable, now its time to polish it then.

As for the faceting:

 The arduino samples 7000 bytes per second so if you are scoping a 4Khz signal is normal that the wave looks faceted and that the FFT becomes somehow confused because of that.

 BTW I am looking at how can I get higher bitrates on the arduino... has anyone tried this? I know on mac it seems to work out of the box, what is the gotcha on windows?

 As for generating functions I suggest using SoundArb
   http://slatecreekengineering.com/SoundArb.htm

 Thanks guys for the support!
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