Hacked Gadgets Forum

March 19, 2013

Dot Matrix Wall Writer – Time Writer

at 6:06 am. Filed under DIY Hacks, Electronic Hacks, What Were They Thinking


Olivier van Herpt invented a machine called the Time Writer. It allows any graffiti artist in training to get their message out to the masses with the push of a button. An Arduino controls the action here. The Arduino pulses a number of relays which open and close paint nozzles. The paint mixture is pressurized using a re-purposed water fire extinguisher which conveniently has a valve just like a car tire. I think this would be a very effective guerrilla advertising technique if it was hidden under a car and used water soluble paint so that your message only lasts until the first rain. Β 


Dot Matrix Wall Writer - Time Writer


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10 Responses to “Dot Matrix Wall Writer – Time Writer”

  1. M'K Says:

    “Gorrilla Advertising” http://www.michaelcropper.co.uk/wp-content/uploads/2011/09/guerilla-marketing-at-its-best-in-manchester.jpg

    Funny b/c they meant it the other way, and also spelled it wrong.

    Neat project idea though.

  2. Alan Parekh Says:

    Thanks for the catch MK. πŸ™‚ Love the picture!

  3. Polytech Says:

    Pretty cool but definitely needs to sync the timing of the valves opening with the actual speed the “operator” err. “guerrilla marketer” moves the boom along the wall. Sort of like an optical mouse’s response of the X/Y movement – not that easy of course because unlike in the mouse, the distance to the wall is changing, too. Could have driven a car along that wall with the boom sticking out for a better looking output, I guess.

  4. medix Says:

    Awesome. I’ve seen this before and it never gets old. I just moved to Eindhoven, Netherlands and it turns out that this guy is about an hour’s walk from my apartment! Time for a visit! πŸ˜‰

  5. Jeffrey Delia Says:

    This is actually good but it still has a lot of potential for further improvements. I really like the idea of doing advertising using this technology. But I prefer the use of water soluble paint, that is really cool.

  6. Per Jensen Says:

    The fire extinguisher does not have a valve like a car tire, it’s been added.

  7. Alan Parekh Says:

    Hi Per,

    Many of them do, you need to look for the ones that were simply pressurized water extinguishers. I have one in my garage that I use as a high power super soaker! You simply fill it 3/4 full of water, screw on the top and then pump air using a normal car tire filler till the pressure gauge is in the green.

    You are probably thinking of the dry power type.

  8. Per Jensen Says:

    Alan, Here in Europe, the water extinguishers are filled with deionised water and nitrogen – this is to make sure that nothing in it can fuel a fire and/or cause electrical shorting. The extinguishers we have here in Denmark are approved at up to 1000 Volts, since the deionised water does not conduct electricity. If it was possible for the enduser to fill up the extinguisher himself, it would destroy the safety-assurance that it’s safe to use it on electrical equipment. As it is, it is not possible to refill them yourself, nor water or air. It’s the same with the powder extinguishers, you cannot fill them yourself.

  9. Time Writer, write dot matrix graffiti on the wall β€” Arduino Passion Says:

    […] Video: Source: olivier van herpt Β via Hacked Gadgets […]

  10. Dan Says:

    It looks like somebody has been reading “Beebo and the Fizzimen”.


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