![]() ![]() The code determines whether each valve is in an area considered light or dark: If dark, the valve spurts water. ![]() (Damen comments in the video that you can also choose the font, but “only one font works.”) The message is then converted to an image, analyzed, and then divided into segments based on the number of valves on the truck. Damen created a website on the device, on which you can type the message you want and choose the speed of the print job. ![]() Meanwhile, the hoses split the water flow from a central point (a pump and a bucket full of water) to each valve.Ĭontrolling the setup is the Raspberry Pi, which is connected to each valve through a relay and the solenoids. The solenoids control the valves-when 12V current is applied to them, they open. A plywood and a trailer hitch form the frame of the rig, with solenoids, valves, and hoses then mounted to the wood to serve as printer parts. In the video, Damen explains how the idea came to be (watching trucks paint markers on the road), as well as the process of constructing the “printer” and the materials used. ![]()
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