Graffiti is a controversial topic, and whether you consider it art or vandalism often depends on where and how you encountered it. From stickers scrawled on the walls of houses to highly intricate murals, they often have one thing in common: a political statement, a gesture of appreciation, or a simple “I was here.” [Sagarrabanana] has a statement of his own, but has opted for a less permanent way of expressing himself through graffiti.
Dissatisfied with the lack of dedicated bike lanes in his area, he built a self-contained, Arduino-controlled bike water trailer to write his message on every street he passed. The assembly is documented in one video and shown in action in another – both in Spanish (and also embedded after a break), but a picture is worth a thousand words in any language.
Inspired by Persistence of Vision (POV), where moving LEDs flash in sync to create the illusion of a static image, [Sagarrabanana] translated this concept into water on the road using a series of solenoids connected to a water tank. Each solenoid is controlled by a relay, and a predefined font determines when each relay switches—much like a pixel on a display turns on or off, except for a small jet of water while the bike is in motion. The message itself is received via the bluetooth serial module and can be easily changed from a phone, for example. To adjust water distribution based on speed, the entire system is synchronized with a magnetic switch mounted on one of the trailer’s wheels, so theoretically you can take it with you on a run.
Time will tell if [Sagarrabanana's] mission is as successful as he hopes, but there’s no doubt the trailer will grab attention wherever it goes. Well, let’s hope he gets his message across without changing the writing medium too radically. Though we’ve seen graffiti robots use chalk spray in the past, so there’s definitely room for a less permanent upgrade if needed.
Cool, but hard to read, not to mention the language barriers. I just hope the people he’s trying to contact follow him with drones too.
The wide trailer will certainly help motorists see it, and hopefully it won’t be a distraction.
cool. It would be great if cycling was safe and easy so that people don’t have to travel that far.
All it takes is a few parking spaces, flower pots or a concrete slab off the main road. and thousands of filter bollards and speed signs throughout the city (including suburbs) to improve access to areas (residential and commercial). The second creates areas with low car traffic, keeping everyone accessible but preventing cars from passing through the traffic.
London is building 115 LATNs, 60 school streets and 36 bike lanes for just £22m. It only takes a dozen poles to transform a neighborhood (including the suburbs). Paris also underwent dramatic changes last month. Check out the old Mini Holland layout in London for images.
The overall NL cycling network (not just the main routes) makes up 80% of the LATN network. Most trips in many countries are local trips (<5km), even in the dreaded suburbs of Auckland, and LATN will allow people to do a lot of that (especially very local trips) – for commuting, bikes work wonders. LATNs are great offshoots when you add bike lanes. Many people in the Netherlands can be opened/crossed by emergency services and public transport. A dozen transit barriers – a special type of modal filter – will transform public and active traffic in your center. Oxford is about to install them: https://twitter.com/OxLivSts/status/1266386140493471744
You know what some cheap LATS will do next to the train station, with a small parking lot? How many bike lanes is a bonus? The catchment will explode up to 3 times the radius. Electric bike 5 times. That’s at least *nine* times the number of people who can use it. The integration of cycling and PE is often completely ignored. In the Netherlands, 50% of people start their train journey by bike. Utrecht has 12,500 parking spaces at the Central Station out of 33,000 parking spaces. A few LATN and PT nodes can do wonders for long distance travel.
LATN is very powerful. They can get thousands of kids to bike to school because schools are often very localized. Go to local shops on weekends and weekdays. work locally. Create a community. Encourage local business. As an offshoot of the bike path, without you, the bike path would run into a lot of junk residential streets with irregular traffic. They can start a cycling culture cheaply.
My city of Auckland will be doing something similar in our downtown starting next month. They call it access for everyone. They will also reduce the speed from June 30, 2020. I was going to CC on my e-bike on the train, can’t wait for the right community for 50,000 people 
Often this means a significant increase in restrictions on cars. This is unacceptable. Cycling is primarily a male sport, not a means of transportation. So it is unacceptable to obstruct real vehicles or rob real estate reserved for cars.
I think I saw something similar here some time ago, only there was chalk instead of water.
Just realized that his tank design doesn’t give him any driving advantage. When it empties a little, water splashes from one end to the other. If he gets two or three hits with the right bike on each side, he can get close and throw him off the bike. Definitely makes driving downhill very “fun”.
You must have fought this desire with every fiber of your being. Whatever it takes, I’ll give up too.
Yes, this is what I want to fix in the next version. But now that I don’t have a studio, and since I do all this in my living room… I’m a bit afraid to solder at home, so I decided to use PCV.
Partitions might be a solution for rtkwe mentioned in the post above. To do this with PVC pipe, cut PVC discs with notched edges and secure them in place with the same adhesive as the pipe before installing the end caps. Alternatively, they can be folded and nutted onto stainless steel, brass or nylon threaded rods. –|–|–|–|– In this case, they should not be made of PVC, but of a material that does not deteriorate in water. The end of the threaded rod must be flanged with a nut, or the nut must be welded or epoxy bonded to the washer so that the end of the rod does not pass through the end cap.
(This type of tubular tank has been considered in the past as a possible easy way to make small tanks for small teardrop shaped camping trailers. Large diameter pipes can be hidden behind the kitchen area or hung under the trailer from side to side. So I’m just a reminder to anyone thinking about this use to make sure whatever is used to make the baffle, epoxy, baffle material, etc. is compatible with the use of potable water.)
The concept is similar to my sand printer https://hackaday.com/2017/09/03/poetry-in-motion-with-a-sand-dispensing-dot-matrix-printer/
These types of devices have quite a long history and it’s hard to recognize what inspired them >
GraffitiWriter and StreetWriter (1998) > https://we-make-money-not-art.com/interview_with_18/ Chalkbot by Nike > http://blog.nearfuturelaboratory.com/2009/07/07/ chalkbot – with a graffiti writer /
This was my inspiration, a long time ago. This much more sophisticated one – mine – is just an excuse to learn PIC programming. https://hackaday.com/2008/05/24/pic-control-spray-paint/
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Post time: Jan-23-2023