http://principialabs.com/arduino-pulse-width-modulation/ design, build, test, iterate. Mon, 26 Jul 2010 13:17:52 +0000 hourly 1 http://wordpress.org/?v=3.0 http://principialabs.com/arduino-pulse-width-modulation/#comment-29 Brian Fri, 15 Aug 2008 17:24:39 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-29 <p>Scott: If you're trying to control large numbers of LEDs with Arduino, while using as few output pins as possible, you'll need to use a technique like <a href="http://www.google.com/search?q=arduino+led+charlieplexing" rel="nofollow">Charlieplexing</a>. PWM should work there as well, but I haven't tried it personally!</p> Scott: If you’re trying to control large numbers of LEDs with Arduino, while using as few output pins as possible, you’ll need to use a technique like Charlieplexing. PWM should work there as well, but I haven’t tried it personally!

]]> http://principialabs.com/arduino-pulse-width-modulation/#comment-28 Scott Fri, 15 Aug 2008 16:59:14 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-28 <p>So how would I incorporate this with a larger number of leds? Wouldn't I need a larger voltage source?</p> So how would I incorporate this with a larger number of leds? Wouldn’t I need a larger voltage source?

]]> http://principialabs.com/arduino-pulse-width-modulation/#comment-27 Chris Thu, 12 Jun 2008 02:18:07 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-27 <p>Awesome. That's cool! From a newbie perspective, I'm wondering how many LEDs a single Arduino could control at once like that, possibly adding on shift registers of some sort? Time to do some more research... :)</p> Awesome. That’s cool! From a newbie perspective, I’m wondering how many LEDs a single Arduino could control at once like that, possibly adding on shift registers of some sort? Time to do some more research… :)

]]> http://principialabs.com/arduino-pulse-width-modulation/#comment-26 Brian Sat, 08 Dec 2007 22:43:53 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-26 <p>Ooh I love the airport beacon idea! Also, if you have some of those clear tri-color LEDs, I think you can <a href="http://www.arduino.cc/en/Tutorial/DimmingLEDs" rel="nofollow">use PWM to color-fade</a> with them. No change in resistor value is required; I used plain old brown-black-red-gold 1KΩ resistors for all LEDs.</p> Ooh I love the airport beacon idea! Also, if you have some of those clear tri-color LEDs, I think you can use PWM to color-fade with them. No change in resistor value is required; I used plain old brown-black-red-gold 1KΩ resistors for all LEDs.

]]> http://principialabs.com/arduino-pulse-width-modulation/#comment-25 Pinsky Sat, 08 Dec 2007 21:20:32 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-25 <p>FAR out! Can’t wait to get home to test it out. Maybe do a light house pattern or an airport beacon. Mix it up, you know? Does using the PWM require any change in the resistance I would normally use for the LED?</p> FAR out! Can’t wait to get home to test it out. Maybe do a light house pattern or an airport beacon. Mix it up, you know? Does using the PWM require any change in the resistance I would normally use for the LED?

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