Hackaday links: June 13, 2010

Painting with light

[Jo0ngle] wanted a fun toy and an easy conversation piece. He painted a square on the back of his door with some glow-in-the-dark paint. Now he can draw on it using a blu-ray laser or a UV flashlight. Either way, the effect is quite pleasing. [Thanks Justin]

Resistor decoder rings

This resistor reference card allows you to spin a wheel and dial in the resistor color code for easy reading. We know, you have the simple act of reading resistor code down cold by now. This is still a fun idea that you might use if you’re ever helping someone get into electronics. [Thanks Osgeld]

Resistor bending template

Speaking of resistors, [Jerome] helped us out by designing a resistor bending template. He’s actually marketing himself at the same time. His bending template is folded from one of his business cards, which he came up with after being inspired by some of the unique business cards we’ve covered in the past.

Fake stained glass using old PCBs

[Agg] floated some old PCBs to his friend [Dan] the mason. [Dan] proceeded to turn out an amazing looking stained glass window unit using the colorful leftovers. The picture above doesn’t do it justice, you have to click through to see the real art.

Monovelo monowheel

[Ernst] asked if we’d heard of the Monovelo monowheel. Well we hadn’t. It’s a human-powered vehicle where you sit inside of one large wheel. We don’t see ourselves building one or riding one, but we enjoyed watching someone else do so. We’d like to catch somebody commuting to work with one of these. Seeing this in the bike lane will brighten up anyone’s day.

Comments

  1. SlurmMcKenzie says:

    mhh, nobody complaining about that blu-ray laser pointer ? ;-)
    saftey glasses, protect the eyes, reflections etc ?

  2. Sergio says:

    If you want to see what a real genius can do whith motherboards and electronic components, go check:

    http://tassou.deviantart.com

    Might be worth a dedicated hackaday article, don’t you think?

  3. cpmike says:

    Proudly still have my radio shack resistor color card hanging on the workbench :)

  4. Elias says:

    I’m getting a 404 on http://hackadaycom.files.wordpress.com/ so I can’t see any linked images on the articles.

    Anyone else have the same issue?

  5. localroger says:

    Weren’t there a bunch of those monowheel things in the opening pageant for the Beijing Olympics?

  6. Elias says:

    Ah, now I see the images normally.

    Nevermind :)

  7. wbeaty — January 22, 2007 — Got glow-in-dark paint? UV keychain flashlight? Combine the two.


    I’d also like to say that the UV LEDs are in fact dangerous. Most of the emission is not viewable by people so it’s brighter than it looks. Be careful.

    You could use a blue LED instead of a UV one. That will excite most glow in the dark stuff too.

  8. Tachikoma says:

    that monowheel – it’s not the Southpark variety, is it?

  9. JoOngle says:

    wbeaty – Don’t worry. The commercially available UV-Leds are totally safe! I know this, because I’ve tested them. In fact – I’ve been hunting the so-called dangerous ones to use them for erasing UV-Eproms. Unfortunately (and fortunately for people in general) UV-Leds are as safe as normal UV-Disco lights, the same kind you use for checking upon false bills etc.

    I also have UV-measuring equipment, and my tester says 0,01 uv on the UV-leds, and 4-5 uv on direct sunlight. So the sun is more damaging than a single UV led – hence – totally harmless.

  10. tc says:

    monowheel-“it beats dealing with the airline companies”

  11. zool says:

    finally, now i can cruse like general grievous

  12. MrX says:

    @ SlurmMcKenzie

    Yup. That blu-ray laser is way too powerful. We can see that door surface is good enough to reflect some of the laser back. Not good for the eyes..

  13. Brock_Lee says:

    Worth a mention that there is a bunch of iPhone/Android apps that have resistor reference along with tons of other useful reference and conversion functions.

  14. Garbage says:

    uh… that last link just makes me think of mr. garrison’s vehicular invention… without all the bells and whistles, of course.

  15. Osgeld says:

    the resistor bending card is pretty cool, been thinking about making one out of a old AAA card or something to accommodate other hole jump spacing (not like that hasnt been done a dozen times already)

    right now I just use the “heel” of my thumb to bend the leads right at the entry point, which gives you the hole spacing of whatever sized resistor your using, but not always convenient when using perfboard prototyping

  16. >I also have UV-measuring equipment, and my tester says 0,01 uv on the UV-leds, and 4-5 uv on direct sunlight.

    You are measuring both wavelength and intensity? What units of measurement are you using?

    Unlike “black light” UV tubes that have a broad range of wavelengths, UV LEDs have a narrow notch of emissions. You may not be measuring peek output.

    Just because that one UV wavelength does a crappy job at erasing your eprom does not mean it won’t fry your rods and cones over-easy.

  17. bloodb0ne says:

    now it would be cool to attach the uv or blu-ray pen with 2 servo motors and make a huge “onwall” oscilloscope.

  18. Mikey says:

    The stained glass window is satan with a guitar on the left, but what’s the image on the right? Just a winged angel in the sun?

  19. JoOngle says:

    The wavelenght is 400-407nm
    it peaks around 404nm.

  20. SlurmMcKenzie says:

    @JoOngle
    Ok, so you’ve got about 404nm of wavelength.
    But a normal bluray laser diode has 100mW of Power.
    It’s a class 3B laser !! (read the safety instuctions for that)
    A laser is safe up to 40 µW of power.
    1 mW is safe for about 0.25 seconds.
    a 100mW direct hit into the eye is damaging the eye permanently and instantly.
    and now think about reflections, the laser is 10000 times more powerfull than the safe class 1 laser. that means, a 10% reflection of that would still be a class 2 laser, and by that, still be harmfull when exposed longer than 0.25 seconds.

  21. SlurmMcKenzie says:

    edit: got my numbers a little wrong.
    1% of 100mW is 1mW not 10% ;-).
    so a 1% reflection could still be harmfull (or two 10% reflections)

  22. blue carbuncle says:

    I love resistor value cards! I collected them for a short while.
    A sad and somewhat embarrassing fact: resistance bands were one of the last things I learned (memorized) in electronics. I guess not having EE exams and a card in my pocket made me lazy, OR it pushed other memorized info out finally lol.
    Who DOESN’T cringe when you bump the resistor container. That multi-colored spaghetti is gonna take some time to get back to normal lol.

  23. >The wavelenght is 400-407nm

    If I’m not mistaken, EPROMS like to be erased by UV-C or the smaller end of UV-B. The ones you have are at the top of the UV band. Safer, but be careful. Don’t let the kiddies have them unsupervised.

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