Peggy2 x2, with video

posted Dec 19th 2009 11:31am by Caleb Kraft
filed under: arduino hacks, led hacks

Being avid fanatics of flashing lights, we always love to see the peggy2 in action. The video above shows another improvement, which is two peggy2 units working together as one. [iservice2000] chained the two together and wrote new code for the display. Using an Arduino to drive it all, he has gotten them to act as one. While video on the peggy2 isn’t new, this is the first time we’ve seen two of them chained together. The end result is going to be a scrolling sign that can be updated via the web, or that can display tweets. We did notice a bit of tearing, is that from the camera or the software?

[via littlebirdceo]

Comments [10]

tagged: arduino, peggy, sign, tweet

10 Responses to Peggy2 x2, with video

NatureTM says:

December 19, 2009 at 12:34 pm

Pretty sure the tearing is from the camera. I tried pausing a couple of frames and some appears to tear across individual LEDs. It also seems to be more pronounced when the camera moves.

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Trey says:

December 19, 2009 at 12:35 pm

I’m guessing they used persistence of vision to flash the LED’s at a high rate, which would probably make them appear to be constantly on to a human eye. The camera is just seeing the flashing because of the low amount of time that the “shutter” is open for each frame to be taken. If it was open longer it would appear constantly on.

Also, that’s pretty cool.

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Trey says:

December 19, 2009 at 12:38 pm

@NatureTM

It appears to be tearing across individual LEDs because those LEDs either turned on or off between the time the camera “shutter” opened to take that picture and the time it closed. I say “shutter” because it’s not actually a physical shutter, but it behaves like one.

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NatureTM says:

December 19, 2009 at 1:21 pm

Well yeah, I meant what both of you are saying. Whether its how the leds refresh or a CRT scans the artifacts are caused by the camera sampling a display that otherwise looks normal to the eye due to POV. I’m just saying the display wouldn’t look like that if you saw it, which I think is what was meant. The display/camera create the artifacts together, but I’d still summarize and say, “it’s the camera, the display works fine.” (afaik)

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frollard says:

December 19, 2009 at 7:24 pm

What you can do to make the tearing better on a camera is up the exposure time – if this isnt possible manually, you can trick the auto mode by putting a tinted lens in front of the camera (sunglasses work) so it thinks its darker; and thus takes longer exposures.

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Dog says:

December 20, 2009 at 12:29 am

Yes another Aurdino blinking LEDs. When will it ever end… About the useless toy to date.

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Jeff says:

December 20, 2009 at 1:52 am

0:31 you can see tearing is from the camera.

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wdfowty says:

December 20, 2009 at 4:31 pm

Am I the only one that can’t see the picture?

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D_Z says:

December 21, 2009 at 10:13 pm

Searching ” “Using an Arduino” site:hackaday.com” on google returns 275 results. Searching ‘Arduino’ alone with ‘site:hackaday.com’ returns 7,840 results. Anyone else sick of the Arduino?