The ChalkJET: An Ink Jet Printer For The Streets

Chalk Jet

Need to do some guerrilla street advertising? What you need is the ChalkJET 9000, an ink jet printer on wheels.

Using two Arduino Duemilanoves for the brains, this little cart features eight cans of spray chalk which can be individually actuated. Small solenoids pull down on levers in order to spray the cans. Encoders on the wheels of the cart keep track of the spacing in between each pixel as the cart gets dragged along.

A small LCD mounted on the handle allows you to select which text you would like to print, but it doesn’t look like manual entry of new words is possible — You’ll need to load up a library while connected to a computer before hitting the streets!

This was the final project for four UC Berkeley mechanical engineering students back in 2009. Can you imagine throwing a larger version of this onto a car?

[via HackedGadgets]


  1. Andrew says:

    2009? What is this? Hack-a-decade?

    Fail for using two Ardunii, and fail for no free text entry.

  2. medix says:

    Something similar was featured back in 2004/2005!

    Sure it’s a novel idea, but it really never gets old..

  3. t-bone says:

    What’s most pleasing about it is the simple idea. A tiny flash of inspiration and the design just spills out from it.

  4. F says:

    Nike Chalkbot, 2009 Tour de France

    Yeah a sneaker company schools the hackers

  5. cb88 says:

    Epic.. would have been if it used regular sidewalk chalk. Still pretty cool though…

  6. TDJ says:

    And if he wanted to create more hi-def images, he should put the cans closer to the surface, and put a second row of cans to use, offset in the middle between first row, so he would get double resolution. Inkjet heads work the same way.

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