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At the current moment, the SX1281 (RF IC) and ESP8285 (central MCU) are built into an off-the-shelf package called the ELRS Micro Receiver from BetaFPV. In order to reduce size and weight of the fixed-wing aircraft, we want to integrate the buck converter/LDO regulator onto a single board with the MCU and RF IC. We also want 1 more PWM output (versus the Micro Receiver’s 5) for an additional point of control for the fixed-wing plane. We also want to allow for the possibility of connecting 2 motors, so the battery input will be directly split to 2 output XT60s.

This buck converter will also be missing the reverse polarity protection from the Meghan’s board, as it was deemed not required for this project.

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This makes R equal to 130 ohms. We can find and place the appropriate resistor into the design.

Schematic Design Review

Net Naming Guidelines - Making sure each power net in the design has an appropriate label. Crucial for PCB layout time.

Electrical Terminology - A sort of review for terminology in EE

https://drive.google.com/file/d/1S0Mzs7YdFf1vUP41wHp3JbctDb-8adoG/view - Simulating the input filter to make sure the capacitor configuration is working harmoniously

Clean up schematic styling - following industry/WARG standards for a clean and readable final schematic

Next, can let EFS team know of the design and to review that the PWM outputs from the ESP8285’s pins are possible and appropriate. Once that is complete, an EE lead can do a final review, and PCB layout can begin.

PCB Layout

Buck Converter

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