Throughout this project of creating a technical object, I was able to realize how complex the process of creation is, because indeed:
- Many parameters are considered (of the Order of the physics;
- Some parameters are closely correlated (while others are independent);
- Some parameters are a personal choice or a preconceived idea, others are simply physical laws (NB: Sometimes it is not easier to lift an obstacle linked to a preconceived idea than another one linked to a physical law).
It is not a linear, but cyclical or rather spiral approach. We go through phases of information retrieval, design, research of the right material. Then come the phases of construction and experimentation. When we do not achieve the expected result, we return to the phases of research, design, construction and again experimentation. Sometimes, after several cycles, we achieve the intended goal, and we are happy! When you do not succeed, you are less… We are then led to question certain starting choices, some parameters. And then the cycle starts again…
Today, accompanied by Elisabeth Dounon, I visited the training center of the apprentices of the industry in Dijon (CFAI 21-71). For me who loves technology, it was a pleasure to discover their equipment, especially the room dedicated to robotics. Then we considered how the apprentices could be associated with the process of creating the solar bike.
I had already seen this French humanoid robot, Nao, at events around digital education.
Obviously, in the lobby, this sign has taken my attention.
Pilot testing of a step-by-step motor programming on Arduino: Driving an engine… By Stephane-suntrip2017 driving tests of a servo motor
Today, the FabLab Kelle Fabrik organizes a workshop to learn how to program an Arduino module. I was enthusiastic about it. What relationship with the construction of a solar bike, will you object? Well, I had seen that some participants in Suntrip 2013/2015 optimised the recovery of solar energy by orienting their solar panels. So the idea germinated to automate this process and I began to dream that, while pedaling, my panels would orient themselves in a dynamic way according to the Sun. Let us hear well: they would orient themselves along a single axis, that of the trajectory of the bike. And of course, I would activate this automatism only in the absence of wind (I was able to realize that with wind, even weak, the panels had to remain well horizontal).
Two days before this workshop, I had installed the free and free blender software on my personal computer. By discovering the complexity of the interface, I quickly abandoned the exploration, discouraged. And tonight, after 2 hours of discovery guided by the animator of Kelle Fabrik, I almost manage to finalize my project! I can't believe it. It's great, sharing, collaboration… Thanks to the FabLab to exist!
It must be recognized that there is a special, exciting and almost magical atmosphere here.
Today, I met Philippe Heinrich, the director of a Dijon company specializing in 3 D printing and software training: I was able to discover the different materials for printing parts with mechanical properties Specific.
Of all the motorised modes of transport, the electrically assisted bicycle is one of the most economical: it is estimated to be able to travel on average over 1000 km for €1 of electricity *. * At the current rate of €0.09 per kwh.
How will I go about making my solar bike? I do not have an electrically assisted bicycle, I know very little about capturing solar energy … Suddenly, the questions flow in all directions:
- for electrically assisted bikes: what type of motor? Hub motor or bottom bracket? Motor on the bike or on the wheel of a trailer that pushes the bike?
- what power for the battery?
- how can the uneven power of the sun charge the battery? How is it regulated?
- For solar panels: how much? What power? What dimensions? Where to install them? On the bike, on a trailer, on both? How to fix them?
To sort out all these ideas, I make a mind map: https://app.wfor resources on the internet, there is no shortage of them. Of course, I come across "THE" precursor: From France to Japan by solar bike
I have the project to keep traces of this adventure, in the form of writings, drawings and images. Pictures of course, but I would also like to report films of this SunTrip 2017! Fix on the "film" The Landscapes that parade, the inhabitants of the villages crossed, and the soundscapes also. However, if I regularly practice the photo, the animated image is somewhat unfamiliar to me. So when I meet Sasha and Perrine, both film professionals, I take the opportunity to ask them for advice. How could a neophyte like me exploit a camera in an adventure such as the Sun Trip? Both are lavish in recommendations and advise me before any economy, sobriety, efficiency… I tell myself that they aimed just, me who too often have a taste for glut! Perrine recommends the film by Thierry Frémaux on the Lumière brothers. Passing through Lyon two weeks later, I run to the institute Lumière to obtain the DVD. I have watched it several times already, there is so much to learn… Thanks to you, Perrine and Sacha, I hope that I will live up to my task in July!
Today I met Jean-Claude who is a physics teacher in Dijon. I asked him all the questions that had come to my mind on the previous days:
- How to calculate the energy consumed by the bike to determine the required surface of solar panels?
- How is solar energy regulated by nature so fluctuating?
He enthusiastically embarked on clever calculations and brilliant demonstrations, which I sometimes only partially understood, but it was so reassuring to meet someone who knows! Someone who dissipates the fog around us! I will leave with answers and full of new questions, particularly on the practical aspects of the implementation of these basic principles. Before leaving, Jean-Claude tries my electric-assisted bike. For the photo, he poses near the sign bearing the name of his street: "Path of the solar", I'm on the right track!
According to Wikipedia, an electric power-assisted bicycle (V.A.E.) is a bicycle equipped with an auxiliary electric motor and a rechargeable battery. Legal definition of a V.A.E. In France, a bicycle with electric assistance must conform to the European Directive EC2002/24 and the French standard NF R30-020 laying down the following general principles:
- The rated power of the engine shall not exceed 250 watts,
- The assistance works up to the speed of 25 km/h, not beyond,
- The support is provided only when the user is pedaling.
A vehicle will be considered a moped if one of the following conditions is fulfilled:
- The rated engine power is greater than 250 watts,
- The assistance operates at a speed of more than 25 km/h,
- The support works when the user does not pedal, for example using a joystick.
In France, such a vehicle must be insured like any moped and requires the wearing of a suitable helmet. Moreover, it is not allowed to take the bike paths.
This afternoon it was my "first time", my first try with an electric-assisted bike loaned by the gable-on-street cycle shop. It was a very informative outing for a novice like me, my impressions were contrasting: on the one hand, a great satisfaction to climb the coast of vises at an unusual speed, but on the other hand, what frustration on flat ground when The assistance leaves me as soon as I exceed 25 km/h, the high weight of the bike is then felt! I'll have to get used to it… But on reflection, in recent years, when I randonnais bike with my saddlebags (tent, sleeping bag, clothes, food etc…), my average speed has always been less than 25 km/h. This will still be the case this summer, especially since the course in the Alps will have a difference! Under these conditions, the lack of assistance beyond 25 km/h will be more rarely felt.
In 2013, the first SunTrip had made me dream so much: 30 adventurers who had to join Kazakhstan by solar bike, it seemed so incredible, so exciting! Then there was the 2015 edition just as rich in adventures and lessons.
The 2017 version of the SunTrip will be a “Tour” on a course certainly less oriental than the previous ones but whatever, the departure in July will finally allow me to participate!
At the time of registration, I dream of travel and adventure., I think of all those who had the chance, the privilege to participate in previous editions …
From the first days, I realize that the adventure begins already!
With a lot of questions, unknowns, constraints, research, ideas …
How am I going to build a solar bike? h3>