When Ryder set his mind to creating a massive dot matrix printer, he also decided that it would be awesome to drive it. Now he has a truck that can write on the road as it drives.
The idea here is relatively simple. A bit of water on the road creates a dark spot. If you can drop water at the right places while you drive, you can print words. For water release, he’s using pretty standard solenoids, some clever code on a raspberry pi, and a little luck.
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