[bouLED] Drawing the main board’s schematics

Today, I started drawing the main board’s schematics. It’s not finished yet: the decoupling capacitors have yet to be chosen and I’m not done with the STM32H7 (pins like VBAT, VREF, BOOT0, etc.). As a teaser, here’s the power supply:

It takes a 14.80V input (from a 4S LiPo) and steps it down to 3.3V. That’s not the right buck converter (it should be a LT1765-3.3), but the pinout is the same, so when it’s done I’ll only have to change U1. The SDHDN_n pin is left floating on purpose, according to the datasheet.

Here’s a sneak peek at the unfinished parts of the schematic:

[bouLED] Triangles’ circuit diagrams

The electrical design of the faces is almost done. The triangles were first thought to be the equivalent of the LED strips:

78 APA102C

But then we chose to put one 14.8 to 5V regulator on each face:

The buck regulator

Add a few connectors and that’s all there is to these PCBs.

In addition to not being decided about the internal structure of bouLed, we also need to choose the enclosing transparent sphere. This constitutes an important size constraint, and we might have to reduce bouLED’s size by a few millimeters to fit it. More on that soon.