UWB Direction-Finding Flight Controller — STM32G473

Overview

A compact flight-controller-class board that measures aircraft bearing with a UWB radio array, sits inline on the pilot's control and video links to overlay warnings — with hardware fail-safe bypass.

Challenge

Design a 36×36mm 4-layer flight controller with STM32G473, 3-receiver UWB array for PDoA direction finding, CRSF inline pass-through with hardware fail-safe, and OSD warning overlay.

Our Approach

• STM32G473 (Cortex-M4, 170MHz) with DW3220 UWB array
• CRSF inline pass-through with hardware fail-safe bypass
• OSD warning overlay onto pilot video feed
• 4S LiPo input with reverse-polarity and TVS protection
• 30.5mm M3 mounting pattern, 4-layer 1oz copper

Technical Highlights

• 36×36mm, 4-layer, 1oz copper on standard M3 pattern
• 3-receiver + anchor DW3220 UWB for PDoA sensing
• Hardware fail-safe: pilot RC survives total board power loss
• 90Ω length-matched USB pair

Deliverables

• ✓Fabrication-ready EasyEDA Pro source
• ✓Netlist and BOM
• ✓Client design review documentation
• ✓All review findings closed and verified