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Color Sweeper


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#1 andersborg

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Posted 12 February 2011 - 01:51 PM

My very first project on the Netduino: Software for controlling an RGB LED for color effects. You'll find more information here: http://abiro.com/w/2...of-abstraction/

I'm in the process of asking around whether this would make commercial sense, e.g. for art exhibitions, window displays etc. Netduino would most likely be too expensive for that.

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#2 Chris Walker

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Posted 12 February 2011 - 01:57 PM

Very cool. BTW, I've heard that there are a lot of people using Arduino/Netduino in art exhibitions, displays, etc. $35 and some artistic creativity :) Chris

#3 Nevyn

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Posted 12 February 2011 - 06:18 PM

My very first project on the Netduino: Software for controlling an RGB LED for color effects.

Funny that you should post this today - I've been playing around with a similar project this afternoon :) .

Regards,
Mark

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#4 stacyh3

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Posted 13 February 2011 - 03:28 AM

Funny that you should post this today - I've been playing around with a similar project this afternoon :) .

Regards,
Mark


Okay. Crazy coincidence! I've been playing with RGB LEDs today too! I found out that there are at least two types: common cathode and common anode. Does anyone have pros/cons for using the different types? Any tips?

Thanks,
Stacy

#5 Chris Walker

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Posted 13 February 2011 - 05:11 AM

Okay. Crazy coincidence! I've been playing with RGB LEDs today too! I found out that there are at least two types: common cathode and common anode. Does anyone have pros/cons for using the different types? Any tips?

Thanks,
Stacy


With common cathode, you'll drive power to each of the colors using OutputPorts or PWM. With common anode, you'd pull current through the LEDs by doing the opposite (i.e. writing 'false' to OutputPort would turn the LED off).

I prefer common cathode because it's straight-forward, but common anode may be more popular. Also--how much current do you need to drive?

Chris

#6 stacyh3

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Posted 15 February 2011 - 07:32 AM

With common cathode, you'll drive power to each of the colors using OutputPorts or PWM. With common anode, you'd pull current through the LEDs by doing the opposite (i.e. writing 'false' to OutputPort would turn the LED off).

I prefer common cathode because it's straight-forward, but common anode may be more popular. Also--how much current do you need to drive?

Chris


I see what you mean about common cathode being more straigh-forward. For now, the project is just a single RGB LED, so not much current draw. It's one that I picked up from Radio Shack. I think I might want to go bigger/brighter at some point, but I'm not sure yet. I may also attach an LCD display.

Stacy

#7 stacyh3

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Posted 22 February 2011 - 01:38 AM

For those who have played with either the MinM - Miniature BlinkM or the ShiftBrite, how's the color mixing? The RGB LED that I got from Radio Shack is okay, but the color mixing is pretty lousy. I've tried various diffusers, etc., but still can't get decent mixing. Making "yellow" for example, always shows red and green as well.

Thanks,
Stacy




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