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Archive for January, 2008

Back on the Road Again

24 January 2008 Leave a comment

I’m back on the road again doing TruePosition Enhanced 911 stuffs. Since early ’04 I’ve been a field test engineer setting up 911 network overlays for Cingular and T-Mobile in South Florida (Miami), Orlando-Tampa, Minnesota, Kentucky, Tennessee, Alabama, Mississippi, Oregon, and Washington. Read more…

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Categories: Tech, Work

Arduino Oddity — Pulse Width Modulation (PWM) on Only Certain Ports

9 January 2008 Leave a comment

UPDATE II: Edited links to Makezine’s protoshield and TodBot’s candle light code.


UPDATE: I’m an idiot. Once I removed the protoshield, I saw that the board has clearly marked these pins as PWM! D’oh!  I guess I got too comfortable using the shield and never bothered to actually look at the Diecimila itself.


Hmmm… I was modifying Todbot’s candlelight effect code to use multiple LEDs, but it seems that only certain ports on the Arduino allow such (3, 5, 6, 9, 10, and 11); the others merely flash on/off. The whole point of the code is to illuminate the LED in varying brightness such that it looks like a flickering candle.

I’m using this particular prototyping shield (others can be found here, here, here, or here) and ran the tests again on the bare Arduino, but found nothing wrong with the shield. I need to research this to find out why. I’ll update this post when I discover the reason.