My plan is to attach the supplied MSP430FR4133 LaunchpadMSP430FR4133 Launchpad to my tricopter using spacers that were kindly provided by Würth Elektronik (can be seen on the bottom photo). Everything will be powered off from the main battery - that's a 2200mAh 3S (10.5-12.6V) LiPo battery.

Three different supply voltage levels are required.

MSP430FR4133MSP430FR4133 µC should be powered with 1V8-3V6 supply, LED strip requires 5-7V supply and TPS92512TPS92512 requires at least 12V input.

My tricopter already includes 5V supply but I don't want to put that supply to too much stress since it is being used to power the flight controller board so I'm leaving this supply dedicated to flying.

I decided to design a BoosterPack that includes 3V3 and 5V regulators as well as all the necessary power connectors. It also contains the I2C sensor headers for up to three I2C devices and provides the pull-up resistors pads. Additionally, there's a simple voltage divider for the main battery voltage level sensing. To accommodate the LED strip, 1X3 header is provided too. As you can see, I started with the BYOB template from TI but then I decided that I want to use single row headers.

The BoosterPack PCB was etched using dry photoresist film so I had to make it single layer. My laser printer doesn't print nicely on this semi-transparent paper (ghosting issue that can be seen on the right side of the paper) so I had to use a fine tip pen to properly cover all the dark areas by hand.

I managed to etch the board. It doesn't look so good as it would with some nice solder mask but it's much faster than waiting for professional fabricator to deliver one: