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In the video, Damen explains how the idea came about (watch the trucks draw signs on the road), as well as the process of building the “printer” and the materials used. A sheet of plywood and a hitch form the frame of the machine, to which solenoids, valves, and hoses are then attached, serving as parts for the printer. The solenoids control the valves, which open when a 12-volt power supply is used. Meanwhile, hoses divide the flow of water from a central point (a pump and a bucket full of water) to each valve.
The system is controlled by a Raspberry Pi, which is connected to each valve via a relay and solenoid valves. Damen has built a website on the device where you can type in the message you want and choose the speed of the print job. (Damen notes in the video that you can also choose the font, but “only one font will work”). The message is then converted into an image, analyzed and then divided into segments based on the number of fuses in the truck. The code determines whether each valve is in an area considered light or dark: if it is dark, the valve will spray water. When the light is low, the valve remains closed.
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In the video, Damen recounts the ups and downs of making the project a reality, as well as troubleshooting at every stage of the process (when it seemed like the first relay used killed the Raspberry Pi, I actually felt pity — as Damen notes, the Raspberry Pi is hard to get , and it will be difficult to replace it). It’s an interesting journey to follow, especially after years of dealing with dot matrix printers.
If you’ve ever wanted to build your own off-road truck, this is it
This letter is the German translation of the English language
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