Per-channel low-voltage controller PCB for RIL TC/HF/LeTID and PID test benches. STM32H7, 16-bit DAC setpoints, 24-bit ADC sense (4-wire), isolated digital interface to gate driver, PT100/RH conditioning, Ethernet, interlocks. Safety-critical brain board.

Jerky Robot V3 100 mm × 152 mm 2-layer control board with ESP32-S3 and Arduino Nano sockets, screw-terminal I/O, BSS138 UART level shifting, PC817 sensor isolation, optional HX711 interface, status LEDs, test points, top-side component placement, and bottom GND fill for JLCPCB fabrication.

NFC-harvested Omni-Touch wearable board with PN7160 frontend, STM32L041 host MCU, SE050 secure element, palm-grid matrix interface, fingerprint UART connector, and status LED on a flex smart-card form factor.

Slot-machine telemetry board with 5V or 12V input, removable ESP32 module interface, Ethernet connectivity, and isolated money pulse inputs.

Isolated PLC-to-LVDS interface board with one trigger output, two LVDS status return channels, DB9 field connector, selectable 5 V or 24 V trigger conditioning, and protected 24 V power input.

Production-grade 9-cell supercapacitor power module based on the locked KiCad architecture: Vishay 235 EDLC series stack with passive resistor balancing, a lower 6-cell custom bottom board plus upper board continuation, high-current copper zones, direct bus interfaces, and no potting.

ESP32-based sensor camera system with HC-SR04, NEO-6M GPS, ESP32-CAM, optional FT232RL programming interface, 5V input, and regulated 3.3V logic rail.

ESP32-S3 quadcopter flight controller with OV5640 24-pin DVP camera interface, Wi-Fi video link, BLE telemetry, onboard USB-C power/programming, IMU, barometer, ToF altitude sensing, lidar connector, and 4 ESC PWM outputs.

Industrial ESP32-C3 controller board with isolated RS-485, protected 12V-24V input, opto-isolated digital inputs, sensor interfaces, and production debug header.

Bidirectional DC-DC converter management system PCB for energy storage applications. The design targets bidirectional charge and discharge control, dynamic power regulation, energy optimization, and overload protection for storage systems. It integrates a control section with MCU-class supervision, 16-bit ADC measurement, PWM-based power-stage control, and industrial CAN/RS485 communication, while planning practical PCB partitioning for high-current power paths, mixed-signal control, and protected interfaces. Target conversion efficiency is 98% or higher, with CMOS-oriented high-integration design intent adapted into a manufacturable mixed-signal PCB implementation.

EV motorcycle instrument cluster using STM32H743IIT6 main MCU, display interface, CAN, USB, charging, and power supervision

Compact 2-layer ESP32-S3-MINI-1 piezo TX/RX board for a shared 3 MHz transducer node. Includes USB 5 V input, TP4056 single-cell LiPo charging, TLV75533 3.3 V regulation, ferrite-bead isolated 3V3_ANALOG rail, ~12 V pulsed TX boost rail, low-gate-charge NMOS transmit driver, clamp-protected RX input, 2-stage OPA836 analog receive chain, envelope detector, ADC interface, TMP117 I2C temperature sensor, and status LEDs. Layout intent: piezo centered, RX chain within 10 mm of PIEZO_NODE, boost section remote from RX, digital and analog partitioning, and AGND/DGND star connection near RX front end.

ESP32-S3 touch display development board standardized on a portrait ILI9341 TFT by default, preserving USB-C power, CP2102N USB-UART, I2C touch, PCM5102A audio, microSD, and expansion while assigning KEY1-KEY5 to BOOT, RESET, USER1, USER2, and USER3. The next design pass is driven by a portrait-oriented board resize and user-facing edge placement of the display area, touch interface, controls, and primary connector access.

Multi-layer circular BLDC motor controller for a 24 V, up to 750 W system using an ESP32-WROOM with DRV8323RS gate driver, six external MOSFETs, 2 mOhm shunt current sensing, bottom-mounted AS5600 encoder, USB-C programming/user interface, 3.3 V logic powered from the DRV8323RS buck regulator, and heavy motor phase pads sized for approximately 30 A current paths. Target layout is a circular board around 50 mm diameter, expandable if required for thermal management, power routing, and signal integrity.

Raspberry Pi-based drone control PCB focused on mission endurance for an assumed 10 km travel mission. Camera-specific circuitry and storage subsystems are removed. The Raspberry Pi remains the central processing unit and interfaces to power management, RF telemetry/control, GNSS, IMU, ESC/PWM outputs, battery monitoring, and debug interfaces. Assumption: the 10 km requirement is treated as mission travel/range rather than 10 km altitude, subject to later airframe and regulatory review.

This project is a BLE door and window sensor design that uses a U-blox BMD-330-A-R for BLE communication, a reed switch as a sensor, a multi-color LED for status display, and is powered by VBAT. There's also a programming interface and reset switch included. #WiFi #BLE #MCU #ReferenceDesign #project #referenceDesign #simple-embedded #ublox #template #reference-design

This project is a BLE door and window sensor design that uses a U-blox BMD-330-A-R for BLE communication, a reed switch as a sensor, a multi-color LED for status display, and is powered by VBAT. There's also a programming interface and reset switch included. #WiFi #BLE #MCU #ReferenceDesign #project #referenceDesign #simple-embedded #ublox #template #reference-design

Low-power USB-C 5V environmental sensor node with robust input protection, ESP32 Wi-Fi/BLE connectivity, digital temperature/humidity sensing, Bluetooth peripheral syncing, and EEG/PPG sensor interfaces for prototype biosignal acquisition.

Carte STM32F103 2 couches avec alimentation 3,3 V régulée, quartz 16 MHz, USB 2.0 Full-Speed, interface SWD et support de fabrication.

Experimental 21V/5S Li-ion DeWalt battery charger with 21V DC input, relay-switched charge path, tap monitoring, ESP32-WROOM external controller interface, test header, and 2-layer prototype PCB intent.

Raspberry Pi 5 HAT for the Tense Sapphire P.K.E. Meter with two GPIO-driven LEDs, one buzzer, and two GPIO buttons on the 40-pin HAT interface.

Handheld Xbox 360 system with integrated controller electronics, battery-managed USB-C PD power, and a separate dock that automatically switches display, Kinect, and DVD drive paths through a mezzanine docking interface.

Cow health-monitoring wearable PCB for a cow-mounted device. Rear strap electronics target 20-25 g and front sensing assembly target about 15 g. Uses an ESP32-based sensor controller, 200 mAh LiPo battery, battery charging circuitry, and interfaces for ammonia, methane, IR temperature, and saliva sensing. Design must tolerate moisture, mucus, debris, vibration, fur contact, and tongue/lick exposure while remaining compact and lightweight for wearable use.

Glove interface board using Seeed Studio XIAO ESP32S3. Manufacturing path updated for partial assembly: preserve existing glove interface circuitry (FSR inputs on J3-J7, I2C on J8, SPI on J9, pull resistors R1-R7, decoupling C1) and source U1 separately because JLCPCB stock for MPN 113991114 is unavailable. Assemble all other parts normally, leave U1 for customer-supplied/manual installation, and do not substitute U1 unless a verified XIAO-format pin-compatible replacement is explicitly approved.

FlowState Headband EVT1 — 4-Channel EEG Calibration Device Closed-loop EEG neurofeedback headband for theta/beta baseline calibration. 4-layer mixed-signal PCB, 40x30mm. Core ICs: - ADS1299-4PAG (TI) — 4-channel 24-bit EEG analog front end, SPI interface, 250 SPS - nRF5340 (Nordic) — Dual-core BLE 5.3 SoC, 128 MHz app core + 64 MHz network core Key requirements: - Separate analog and digital power domains (dual LDO: LP5907 for AVDD, AP2112 for DVDD) - Split analog/digital ground planes with single-point connection - 6 electrode inputs (4 active + 1 reference + 1 DRL) with individual TVS ESD protection on each - LIS2DH12 accelerometer (I2C) for motion artifact detection - MCP73831 USB-C battery charging (300-500 mAh LiPo) - 2.4 GHz chip antenna or PCB trace antenna at board edge with 10mm keepout - Conformal coating for sweat/moisture protection Reference designs: - Analog front-end: TI ADS1299 EVM (SBAS499) - Digital/BLE: Nordic nRF5340 DK reference schematic Critical constraint: Microvolt-level EEG signals — analog input routing and power supply filtering are the highest-priority layout concerns.