Compact, lightweight, low-power, high-reliability **free-flight model aircraft timer, flight controller, and telemetry system** powered by a single **1S LiPo battery**. The system is based on: * **Nordic nRF52840 QFN48** — main MCU, flight timing, BLE, servo control and system management * **TI BQ25120A** — 1S LiPo charging, power-path management, battery monitoring and regulated electronics supply * **ST LSM6DSO32X** — IMU for launch detection, motion sensing and flight-state detection * **Bosch BMP390** — barometric altitude and vertical-speed measurement * **u-blox MAX-M10S** — GNSS using UART and TIMEPULSE/PPS * **HopeRF RFM95W** — LoRa telemetry using SPI * Up to **5 CHASERVO LV06 servos**, powered directly from the raw 1S LiPo rail * Optional SPI flash for flight-data logging The system shall provide deterministic flight-event timing, five servo-control outputs, BLE configuration, GNSS positioning, LoRa telemetry, motion/flight-state detection, barometric altitude measurement and battery supervision. Primary design priorities are: **Reliability → low weight → small PCB size → deterministic timing → low power consumption → power integrity → sensor accuracy → RF/GNSS performance → manufacturability.** High-current servo power must be kept electrically separate from the sensitive regulated electronics rail while maintaining a common ground. Servo-current transients must not reset or disturb the MCU, sensors, GNSS or radios. The design shall be developed and reviewed as separate functional blocks: **Power → MCU/BLE → Sensors → GNSS → LoRa → Servos → Optional Storage/Expansion → Final Integration** Always **consider the complete system, but implement only the currently requested functional block**. Use `SYSTEM_SPEC.md` for the complete technical requirements and architecture. Use `RESOURCE_BUDGET.md` as the authoritative source for GPIO, bus, peripheral and interface reservations. Manufacturer datasheets and reference designs take precedence over AI assumptions. Flag uncertainties or conflicts for review rather than guessing or silently changing the architecture.

A rechargeable wrist-worn push-to-talk interface for a cloud-hosted AI assistant, with Wi-Fi, microphone, speaker, simple status feedback, and optional direct Bluetooth-earbud audio.

Production four-channel 200 kg load-cell ADC board using dedicated HX711 converters and a Raspberry Pi 40-pin GPIO interface, optimized for low analog noise and enclosure mounting.

Compact redesign of the SIM7000 Shield v5 cellular modem PCB, preserving RF, power, SIM, antenna, and essential interface requirements.

Battery-powered CH592-family BLE electronic shelf label with a 2.13-inch SSD1680 E-Ink interface and sleep-disabled 15 V refresh rail.

General-purpose AD5933 impedance analyzer with protected external 5 V input, regulated 3.3 V rail, host I2C interface, selectable 10 kΩ/100 kΩ/1 MΩ feedback ranges, and DUT connection for measurements up to 100 kHz.

Dual OV5640-class DVP camera to USB 2.0 High-Speed UVC interface using a Gowin GW1NR-9 FPGA and USB3320 ULPI PHY.

USB-C 5 V powered controller generating protected 3.3 V and 8 V television rails plus a piezo tap-detector interface for an external ESP32-C3 module.

3.3 V ESP32-S3 rocket payload OBC with I2C sensors, GPS UART, CAN payload interface, and buzzer control.

Black Magick Heavy Industries KYB1 programmable wireless keyboard, model BLKMGK-KYB1-BASIC, featuring a 69-key layout, XIAO ESP32-C5 controller, Seeed Studio Wio-SX1262 LoRa/Wi-Fi module, configurable RGB backlighting, microSD storage, dual USB-C interface

Dual-ESP32-S3 three-port USB HID passthrough and input-modification bridge with CH343 PC2 command interface, clean-room MAKCU public-protocol compatibility, protected dual-source power, and 4-layer USB-controlled-impedance requirement.

Modern SMD recreation of the Nuova Elettronica LX750 analog curve tracer, with analog X/Y acquisition for RP2040 processing and a 4-inch SPI TFT display interface.

An aes3 usb Interface.

KiCad schematic reconstruction for YachtWave Rev B: ESP32-S3 controller with power input, USB-C, SD card, CAN bus interface, indicators, and protection circuitry.

Portable Linux cyberdeck based on RK3588S2 with LPDDR4x memory, LTE/GNSS M.2, LoRa, USB-C, USB-A 3.0, HDMI, display/keyboard interface, speaker, and battery power.

BLE smart espresso scale with USB-C power, single-cell Li-ion battery charging, load-cell measurement, local data logging, and an integrated segment/display interface.

Battery-powered smart espresso scale with BLE/WiFi-capable MCU, load-cell measurement, OLED interface, USB-C charging, and debug/programming access.

4S1P Li-ion/LiPo battery interface board with XT60 high-current output, JST-XH 5-pin balance connector, exposed weld/contact pads, and 4 oz 2-layer high-current copper pours for 60 A nominal / 100 A pulse operation.

ESP32-S3 carrier board with USB-C 5V power, BNO085 IMU support, GPS module interface, temperature sensing, and a single brushed DC motor driver carrier interface.

Arduino Nano-based DCS-BIOS RS-485 interface module using a MAX487CPA+ transceiver and two RJ45 sockets for bus daisy-chaining.

Raspberry Pi 4 based cyberdeck MIDI controller with a rugged portable interface, tactile controls, display support, USB MIDI, and optional standalone power/interface expansion.

Vibe-wared 5 V 10×10 monochrome LED matrix with 10 mm pitch, cascaded constant-current serial drivers, multiplexed row switching, and an external controller interface.

Battery-powered ESP32-S3 LoRa ePaper sensor board with SHT41 environmental sensing, LiPo charging/fuel gauge, 5V input detection, and a 4.2 inch 300x400 b&w ePaper interface in an 85 x 60 mm low-profile PCB.

Universal PWM Interface Module: 12 V automotive-input board for configurable ECU PWM input conditioning and open-collector fan-module output, with TVS/reverse-polarity/PTC protection, 5 V buck, 3.3 V LDO, selectable pull-up rails, inversion jumper, status LEDs, test pads, mounting holes, and DT13-08PA connector placeholder.

8-channel USB Audio Class 2.0 line-input interface using AK5558 ADC and XMOS XU208 USB bridge