2008 Headshot

The Life Unwired

with Ben Combee

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First Three RGB LED Shields in Action
2008 Headshot
[info]unwiredben

I got my first PC board back from Seeed Studios on Saturday; they arrived mid-week, but since they shipped from China, I had to go to the Post Office to retrieve them and sign the customs form. The box had a variety of parts including a big bag of tiny switches, and it had the five PC boards. I put my own board together that afternoon and tested it, but the real fun was earlier tonight when we got three more of the boards populated and flashing lights. Eric Moore got his waves test pattern running in a spiral configuration, and it looks really nice, especially bounced off a dark ceiling or wall.

There's more pictures at Flickr, and I should soon have the website at http://combee.net/rgbshield populated with part lists and assembly instructions. I've got a few tweaks to make for a version 1.2 of the shield based on our experiences putting these together, but nothing that should be too difficult to setup.

Any more pics or videos of the boards in action? We want more board pron!


I'm working on a video. Flashing LEDs are hard to capture on a video camera, as the light from them doesn't capture well with the CCD sensors. I did get some footage on Sunday night that might work, but I need to edit it a little before uploading it.

Is it the total light from the LEDs or the speed at which the LEDs flicker? If it's the latter, can you just slow down your programs then speed up the video keystone-kops style?

Maybe I just have fast-frame animation on my mind. I was wondering last night while fast forwarding through DVR commercials why someone hasn't put an area of their commercials at the usual fast-forward speeds to have mini-commercials for folks zipping through them. Or maybe it's been tried before and I've just missed it.


It's a bit of both. The LEDs are driven by a PWM chip which is rapidly turning them on and off to get the desired brightness. I can't really slow that down.

In some of the footage, you get a shadow image of the LEDs about half a frame below. I'll probably just go ahead and put that stuff up, though.