Hardware
A 4-layer development board built around the ESP32-S3-MINI module — a dual-core MCU with onboard WiFi and Bluetooth — designed end-to-end in Altium. Dual USB-C ports feed power and data through a jumper-selected source, while an FT231X USB-to-UART bridge with SS8050 transistor auto-reset enables one-click flashing without manual button presses. USB is routed as an impedance-controlled differential pair over a continuous ground plane, with onboard 5V-to-3.3V regulation, ESD/TVS protection on both ports, and GPIO breakout headers along the board edges for prototyping wireless projects.
- Dual USB-C inputs with a power-selection jumper to choose the active source.
- FT231X USB-to-UART bridge with SS8050 transistor auto-reset for one-click flashing.
- 4-layer stackup with ground/power planes and USB routed as an impedance-controlled differential pair.
