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61  Community / Exhibition / Gallery / Re: Autonomous Robot with sensor ultrasonic on: March 18, 2013, 05:51:09 am
Nice job, well done.
62  Community / Exhibition / Gallery / Re: LED POV project, with a spin on: March 13, 2013, 07:32:26 pm
Very nicely done. 
Do you have any pictures of the actual setup as to how you wired it all up?
63  Community / Bar Sport / Water & Sound & 24 Hz sine wave on: March 13, 2013, 07:29:32 pm
Anyone seen this video?
64  Community / Bar Sport / Art of Jim Campbell on: February 26, 2013, 09:44:58 pm
Anyone ever see this guys work before?
I had the good fortune to see his piece Exploded View Birds in a gallery recently .

Basically he takes a lot of LEDS (it hard to estimate how many LEDs, maybe 300?) and makes low resolution "video" with it.

From a distance it really did look like birds flying at a low resolution.
If one wanted to think about copying this, what would be the best way to go about being able to control that many LEDs?
65  Using Arduino / Project Guidance / Re: Help with guiding a tractor on: January 31, 2013, 09:58:48 am
Check out this robotic combine harvester.
He was able to get 1.5 inch accuracy.
66  Using Arduino / Project Guidance / Re: Cheap brackets and hardware? on: January 21, 2013, 07:12:10 pm
Try  or
67  Using Arduino / Project Guidance / Re: Sending Float values to Pachube from Arduino on: January 21, 2013, 07:02:10 pm
Nice project Terry.
I have a similar one with added rainfall and wind. You can see my feed here  I also recently got an Air Space Egg which feeds data to COSM as well.   This has NO2 and CO sensors as well as temp & humidity. See more about them at
68  Using Arduino / Project Guidance / Re: toneAC - Twice the volume, higher quality and frequency Arduino tone library on: January 12, 2013, 09:42:48 am
Thanks, nice job.  This could come in handy.
69  Using Arduino / Project Guidance / Re: stand alone on: January 04, 2013, 04:40:16 pm
You need a stand alone Arduino.

I have made several.
70  Community / Bar Sport / Re: Sourcing parts on: December 21, 2012, 05:57:23 pm
Just stocked up.  Something like 190 parts for under $8 including shipping for $1.40!
How can they afford this?  Government subsidy? Robots that don't need to eat, have breaks or insurance?
71  Community / Bar Sport / Re: Sourcing parts on: December 20, 2012, 08:00:28 pm
Thanks everyone.  Jack found the one I was originally looking for, but the prices at Tayda are crazy cheap.
I do like the the panel mount one from Tayda.
Think I see some of both in my future.  I never ordered from Tayda before, how long does shipping from Thailand to the US generally take?
72  Community / Bar Sport / Sourcing parts on: December 19, 2012, 06:29:18 pm
Just received an order from Jameco.  In it was a DC barrel jack.  I was trying to find a cheaper version of the one from Adafruit.  The one I got was only 45 cents versus 95 cents from Adafruit.  However the one I got is not breadboard or through hole friendly.
I need to solder this onto a perf board and while I can probably file this one until it fits, I will need more in the future.

Anyone know a good source for a barrel jack that is a breadboard or through hole part (that is cheaper than Adafruit)?

73  Using Arduino / Programming Questions / Re: RTCLib parsing on: December 09, 2012, 02:33:00 pm
If your question is how to use the last character in the array:

char last = buffer[strlen(buffer)-1];

Thanks PaulS - that was what I was looking for.
74  Using Arduino / Programming Questions / Re: RTCLib parsing on: December 09, 2012, 10:08:20 am
Thanks Nick.  So I've used sprintf, but am unclear how to get the last character.
This is what I have so far.  How do I get the last character out ?

int parseMinutes()
 DateTime now =;
  char buffer [10];
  int n;
  int a =now.minute();
  n =sprintf (buffer, "%d", a);
  Serial.print("Buffer = ");
  int len = strlen(buffer);
  Serial.print(" length = ");

Results for say 9:15 are -
Buffer = 15 length = 2
75  Using Arduino / Programming Questions / RTCLib parsing on: December 08, 2012, 03:55:46 pm
I'm trying to get the minutes from an RTC using RTCLib to use with a 7 segment display.  Everything else is already working, I just need the minutes  I've got the 10 spot working using a long handed version, but need the ones spot.
// Minutes
  matrix.writeDigitNum(3, 1);
  matrix.writeDigitNum(3, 2);
  matrix.writeDigitNum(3, 3);
  matrix.writeDigitNum(3, 4);
  matrix.writeDigitNum(3, 5);
  matrix.writeDigitNum(3, 0);
For the ones spot, this method would be far too long.
What I've got for the ones spot so far is:
for(int x;x<=59;x++)
   if(now.minute() ==x)
     matrix.writeDigitNum(4, x);
Obviously this only works in some cases.  Is there an easy way to parse out the one spot minutes.  For example, how do I get the 2 out of 11:52?
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