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Rapid Pulse LED Program

Hi there! I have successfully been making some LED hula-hoops but my ultimate challenge lies before me: I want to program colour-changing LEDs so that they pulse ultra-fast and appear 'white' when at standstill but leave rainbow trails when they move. I believe it to be an optical illusion caused by the pulsing... I assume this requires a PIC program but I have no idea where to start or even if I am on the right track - does anyone out there know how I might achieve this? thanking you in advance, Amelia

Picture of Rapid Pulse LED Program
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any picture of this LED hula-hoops,I'd like to see it many thanks
funkylamb (author)  ght-LEDdisplay7 years ago
Here it is in action! :)
funkylamb (author)  funkylamb7 years ago
Hmmm...not sure why that's not showing up...
hey man this is what you are looking for...except i made over 30 modes and you can speed up and slow down the frequency...they will be available to buy soon http://www.youtube.com/watch?v=73msoGYatPA http://www.youtube.com/watch?v=gScuyumkQy8&feature=related http://www.youtube.com/watch?v=RyEY_xHC6ao&feature=related http://www.youtube.com/watch?v=73msoGYatPA&feature=related
øPossum7 years ago
Here is a simple circuit using a PIC10F200. This is a low cost chip (38 cents / qty 100) that can be programmed with the PicKit 2 ($35).

The on time can be easily changed from 1 to 255 milliseconds by editing line 43 of the source code.

Schematic (Can't attach image to this comment!)

Source code
funkylamb (author)  Ã¸Possum7 years ago
Golly, I'm so touched by how helpful this community is! Thank-you oPossum.

Is this what you mean by a PicKit2?
http://au.farnell.com/jsp/search/productdetail.jsp?sku=9945350&_requestid=58613

Would one need separate red, green and blue leds for your schematic to work or indeed for the effect to work? I was planning on using an all-in-one rgb led...

I'm so excited that this might work!
That is a kit with the PicKit 2. The PicKit2 alone is here for a little less.

Are you in AU? The price is much higher than in the US

A single RGB LED can be used if it is common cathode. The circuit and firmware could easily be modified for common anode if needed.

You could also try a color changing RGB LED. It is too slow to appear white, by may look good in motion.
guyfrom7up7 years ago
You could use a PIC (I'm an AVR man, myself), or you could just steer clear of the whole situation and use 3 555 (or similar chip, or use the quad 555 chip, the 558) to drive a few transistors to drive the whole thing. Or, take a look at goodhart's forum about his led scanner thing, if he got that working, that would be a discrete way of doing it.
funkylamb (author)  guyfrom7up7 years ago
Thanks for your reply, I should probably have mentioned that I am a complete ignoramus when it comes to electronics. I taught myself to solder and read wiring diagrams just to make the basic LED hoop. :) Would it work do you think to speed up a colour-changing LED so that it pulses so fast that it appears white? You sound like you know what you're talking about (particularly with your correct use of 'discrete')! I will seek out goodhart's scanner thing...thanks
I can create you a schematic of something that should work soon, probably tomorow... I'm studying for finals right now (that's right, we still have school while everyone else got out like a week ago, snow days seemed like a good thing at the time...), but tomorow is our last day of school, so after that I'll draw one up for you. Basically I'll make it so that you can adjust the speed in which the different colors flash
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