Comments on: Arduino Pulse Width Modulation http://principialabs.com/arduino-pulse-width-modulation/ design, build, test, iterate. Mon, 19 Sep 2011 18:50:49 +0000 hourly 1 http://wordpress.org/?v=3.3.1 By: Alex http://principialabs.com/arduino-pulse-width-modulation/#comment-256 Alex Fri, 24 Sep 2010 23:42:38 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-256 <p>Nice tutorial....Thanks</p> Nice tutorial….Thanks

]]> By: Jason http://principialabs.com/arduino-pulse-width-modulation/#comment-248 Jason Thu, 26 Aug 2010 21:30:40 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-248 <p>How would I pulse modulate something higher than the arduino can run directly? IE 24V?</p> How would I pulse modulate something higher than the arduino can run directly? IE 24V?

]]> By: Brian http://principialabs.com/arduino-pulse-width-modulation/#comment-247 Brian Tue, 24 Aug 2010 13:36:18 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-247 <p>@Ray: Thanks for stopping by. I'm not sure I'm qualified to answer your question. If I were you, I'd contact the sensor manufacturer and explain your setup. If all else fails, the <a href="http://forums.adafruit.com/" rel="nofollow">Adafruit Forums</a> are a good place to ask Arduino project questions.</p> @Ray: Thanks for stopping by. I’m not sure I’m qualified to answer your question. If I were you, I’d contact the sensor manufacturer and explain your setup. If all else fails, the Adafruit Forums are a good place to ask Arduino project questions.

]]> By: Ray http://principialabs.com/arduino-pulse-width-modulation/#comment-246 Ray Tue, 24 Aug 2010 13:21:08 +0000 http://principialabs.com/arduino-pulse-width-modulation/#comment-246 <p>Hi brian,</p> <p>I chanced upon your website. I'm currently trying to work on a CO gas sensor with the Arduino Mega. For the MQ7 CO Gas sensor (<a href="http://www.sgbotic.com/products/datasheets/sensors/MQ-7.pdf" rel="nofollow">data sheet</a>) to work, it requires a pulse of 1.4V for 60 seconds and 5V for 90 seconds.</p> <p>So, if i read your article properly and did my calculation correctly, the pulsewidth should be 255 for 90secs and and 71.4 for 60 seconds.Am I right?</p> <p>Thanks for the great article. I hope you reply soon.</p> Hi brian,

I chanced upon your website. I’m currently trying to work on a CO gas sensor with the Arduino Mega. For the MQ7 CO Gas sensor (data sheet) to work, it requires a pulse of 1.4V for 60 seconds and 5V for 90 seconds.

So, if i read your article properly and did my calculation correctly, the pulsewidth should be 255 for 90secs and and 71.4 for 60 seconds.Am I right?

Thanks for the great article. I hope you reply soon.

]]> By: Brian 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!

]]> By: Scott 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?

]]> By: Chris 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… :)

]]> By: Brian 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.

]]> By: Pinsky 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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