Hichem got the MARG working last week-end, so we tested it with our simulation (see his post) and confirmed this model would suit us and go on our central PCB. With this and the voltage regulators chosen, we have almost all we need to design the PCBs. The triangular ones may be simpler to design, but before we want to know precisely the physical structure of bouLED.
For ease of conception and of battery management, it should be possible to open the icosahedron. One way to do it is to make five faces removable, as shown on this simple model.
The inner armature would support the electronics and the LiPos, ideally keeping the MARG in the center of the icosahedron. Thus the stick supporting the removable part should be moved, and probably replaced with something stronger. The faces would be connected to the central part with JST-like connectors, easy to plug and unplug.
We want to chain the triangles without using too long wires, and we want a removable part. This will dictate how we’ll position each face and how we’ll place the connectors on it, while keeping all triangular PCBs identical. The LED repartition we think we’ll use surely is even enough not to be considered when choosing the face’s orientations.