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What uses a fire extinguisher, a bike pump, and provides hours of probation, community service, and possibly jail time? If you said an automatic graffiti writer you’re correct! [Olivier van Herpt] calls this little job the Time Writer. We call it defacing property… but tomato, tomahto. Details are a bit scarce, but you get a [...]

Tags:  writer graffiti time olivier-van-herpt graffiti-writer time-writer fire-extinguisher arduino hacks  

[David] has always wanted use UV LEDs to write on a phosphorescent surface ever since saw an article about it on Make. He accidentally purchased UV LEDs when he meant to buy purple ones, so he figured that his mistake was all the reason he needed to give UV light writing a try. He built [...]

Tags:  spinning writer leds david light-writer writer-david uv-light led hacks