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).