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16  Forum 2005-2010 (read only) / Development / Re: GPS/sensor datalogging shield w00p w00p on: July 13, 2008, 05:08:14 am
 Sweet, thanks. It would be great to use it as a short-range GPS tracking device ... could really work well to locate a crashed RC airplane.



Phil
17  Forum 2005-2010 (read only) / Development / Re: GPS/sensor datalogging shield w00p w00p on: July 11, 2008, 01:43:43 am
  Would it be possible to stack an Xbee shield on top of this and transmit the data instead of logging it?



Phil
18  Forum 2005-2010 (read only) / Development / Re: RGB LED Sign Hardware on: October 09, 2010, 03:25:31 pm
  I use google all the time. I haven't been able to find much information about this topic that I can understand.

  I was thinking maybe 16 columns and 8 rows. 30fps



Phil
19  Forum 2005-2010 (read only) / Development / RGB LED Sign Hardware on: October 08, 2010, 08:13:26 pm
  Hello all,

   I would eventually like to build a small RGB LED sign that is capable of displaying full motion video.

   I vaguely understand the basic theory of operation ... scanning rows or columns of pixils. I'm not sure how one would go about digitizing video content from say an NTSC source and outputting it to the sign.

  Anyone have experience with this kind of project? Would an Arduino Mega be capable of something like this?


Phil
20  Forum 2005-2010 (read only) / Development / Re: Servo Movement Recording (Data Logging?) on: May 05, 2008, 04:08:55 pm
very interesting stuff.



thanks,
Phil
21  Forum 2005-2010 (read only) / Development / Re: Servo Movement Recording (Data Logging?) on: May 05, 2008, 12:29:28 pm
   hmm. There aren't any libraries available for writing to flash memory. I wish there were. Maybe I should 1st try to save the data on my PC via Processing.

  I probably will end up going with a Wii nunchuck interface. Looks like I could simply strap it to top of my helmet and it would translate head movements. Still gonna need to figure out the jaw and arm pots.



thanks,
Phil
22  Forum 2005-2010 (read only) / Development / Re: Servo Movement Recording (Data Logging?) on: May 05, 2008, 10:27:57 am
  256 resolution will be sufficient. I've been searching like crazy for an example where someone saved serial data to an SD card, but can't find anything. I did find the hardware for the SD card:

http://cgi.ebay.com/SD-MMC-Card-Adapter-AVR-PIC-Microcontroller_W0QQitemZ380022650234QQihZ025QQcategoryZ4663QQcmdZViewItemQQ_trksidZp1742.m153.l1262

   I'm not sure exactly how I would build the helmet. I did think about the wii nunchuck but would like to keep it simple using some cheap pots.

  I think right now I'll worry about figuring out the data logging part.



thanks,
Phil
23  Forum 2005-2010 (read only) / Development / Re: Servo Movement Recording (Data Logging?) on: May 05, 2008, 08:40:41 am
 That would be really great if I could do it with one Arduino.

  I think I would rather save the data at the sampled rate ... less chance of losing anything. If I use a 2GB SD card ... I would think that could store a vast amount of serial data.

  I don't think I will be able to use the RC transmitter pots. I have to work some pots into a helmet that would attach to my head to track my movements.

... What would be seen at the trainer port?


thanks,
Phil
24  Forum 2005-2010 (read only) / Development / Re: Servo Movement Recording (Data Logging?) on: May 05, 2008, 07:47:49 am
  Thanks for the reply mem. I was thinking about maybe using an RC transmitter ...  but wasn't sure if I could accurately store & then reproduce that many PWM signals with the arduino.

   ... I was thinking more along the lines of using at least 2 arduinos:

Arduino # 1 duties:

1)  Receive analog input from pots (I realize there are only 6 analog input pins)
2)  Spit out serial data to a Pololu Micro Serial Servo Controller
    (http://www.trossenrobotics.com/store/p/5125-Pololu-Micro-Serial-Servo-Controller-assembled-.aspx?feed=Froogle)

Arduino # 2:

1)  "Listen" in on the serial data that arduino # 1 is spitting out
2)  Write an exact copy of this data to a memory stick
3)  Spit out the same serial data at the same rate it was received (For playback of servos at a later time).
4)  Control something like the Daisy Mp3 player by Make ... to have audio synched to the servo movement.

   The Pololu Micro Serial Servo Controller can use 2 protocols ... 1 is their own and the other is the Mini SSC II by Scott Edwards. I would prefer to use Scott's because it only requires 3 bytes of serial data opposed to Pololu's 5 or 6 byte sequence.

  This would all be used for Halloween animatronic props. I would like to be able to mirror the movements of a human skull at first. Using only 4 servos to begin with:  Jaw, Head Left & Right, Head Up & Down, Head Tilt side to side. Later on if I get all this to work, I would animate the arms and possibly the fingers. Maybe control some pneumatic cylinders, RGB LED's for the eyes ... etc.
   I don't want to have a dedicated PC running for each prop. I would much rather have a few $20 arduinos controlling the show.

  I want to make a "helmet" that I could wear that would provide the potentiometer feedback... that way when the mp3 voice file is playing I can just memorize the words and "lip sing" it all the while moving my head and arms, etc ... probably have another helper that could hit the occasional switch for LED's to light or something.

  I believe this is the way Hollywood makes their film animatronics seem so life like. Ibet it saves a ton of time doing it this way.

thanks,
Phil
25  Forum 2005-2010 (read only) / Development / Servo Movement Recording (Data Logging?) on: May 04, 2008, 10:28:28 pm
  Hello everyone!

  I was wondering if anybody has tried to record servo movents using an arduino. I imagine you would have to incorporate some type of flash memory device ... like an SD card.
  
  I would like to be able to record the movements of up to 8 servos at once... for maybe 2 minutes max.

   I was looking at RAPU by Brookshire Software .. very expensive @ $300 ... heard it's "buggy at best."

  I know this is very possible with the Arduino. I just need a little help getting started.


P.S.  This would be used for making some cool Halloween animatronics.
  

thanks,
Phil
26  Forum 2005-2010 (read only) / Development / Re: Arduino Nano on: May 15, 2008, 12:46:26 am
Very pretty. When will these be for sale?



Phil
27  Forum 2005-2010 (read only) / Interfacing / Re: Interface SRAM 23k256 to Arduino Duemilanove on: September 11, 2010, 07:08:07 pm
Anyone know if using an SPI SRAM chip would be any faster than using an I2C EEPROM chip?

   Right now I'm experimenting with an I2C EEPROM chip of the same size. It works great, but it takes 5ms to write a single byte. I know I could write it about 30 bytes at a time, but one is easier.

  I imagine this SPI SRAM chip is capable writing a single byte in less than 5ms.


thanks,
Phil
28  Forum 2005-2010 (read only) / Interfacing / Re: interfacing a 12 Bit SPI ADC on: July 08, 2008, 11:04:34 am
  I figured it out. I had to use a separate power source for the analog end of things. I connected the pot wiper (from analog source) to AGND pin.

In the end it brings the resolution down to only 11 bits instead of 12. I have my Vref set to 4.77V (from digital source) and AGND of 2.25V .... my ADC range is from 0 to 2047. Is there any way to make this range from 0 to 4095 ?


P.S.  I didn't connect the Analog ground to the digital ground.


Phil
29  Forum 2005-2010 (read only) / Interfacing / Re: interfacing a 12 Bit SPI ADC on: July 08, 2008, 09:36:48 am
  I'm back to just using this on Arduino.

I'm trying to use the AGND pin. I tried putting about 2V on it, but it just shunts down to millivolts ... since it is an analog ground. Is AGND really meant for setting a lower limit? The spec sheet doesn't really mention too much about it.

 

Phil
30  Forum 2005-2010 (read only) / Interfacing / Re: interfacing a 12 Bit SPI ADC on: July 07, 2008, 04:25:09 pm
   I've been messing around with it for the last couple hours on the correct pins ...  still the same results. I have no idea what may be the problem.



Phil
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