Modular DIN-rail 32-channel relay system with an IEEE 802.3at PoE+ Ethernet controller, protected 24 V field power, isolated RS-485, three bistable lighting modules, and one high-inrush relay module.

A Raspberry Pi 4 HAT that distributes a 5 V/5 A PoE-splitter supply through protected branches to the Pi, an existing Arducam PCA9685 pan-tilt controller board with two servos, and a switched 5 V laser module.

This is a Pet Tracker Reference Design based on STM32L4. Tracker connects with network by SIM800L module connected to the STM. Also MCU connected to the GPS by uart and send data to server #STM32 #GPS #G4 #G3 #LTE #IoT #Tracker #smartHomeDevices #referenceDesign #edge-computing #edgeComputing #stm #template #referenceDesign

3.3 V-powered pH and ORP probe interface using an ADS1115 module, MCP6002 through-hole buffers, and DS18B20 temperature sensing. External ESP32 connection is through one 5-pin header carrying 3V3, GND, SDA, SCL, and DQ; ADS1115 ADDR is fixed locally and ALERT is unused.

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.

Industrial 12–24 V ESP32-S3 gateway with dual isolated Modbus RS-485, native USB-C, and a W5500 module header.

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

ESP32-S3-WROOM-1 module prototype with four generic resistor placeholders.

ESP32-S3 N16R8 based IoT board using a WiFi/BLE MCU module as the main controller.

Compact USB-powered desktop CO₂ air quality monitor using an ESP32-S3 module, Sensirion NDIR CO₂ sensing, I²C OLED display, and RGB air-quality indication.

Single-subsystem 3.3 V synchronous buck-boost regulator reference built around the TI TPS63802DLAR in a 10-pin VSON package. The design accepts a VBUS input rail into VIN, uses a Bourns SRP4020TA-4R7M 4.7 µH power inductor between L1/L2, and generates PP3V3 from the adjustable TPS63802 output path. The TPS63802 metadata lists a 1.3 V to 5.5 V input range, 2 A output current, selectable switching-frequency modes around 1.4 MHz to 2.1 MHz, and -40 °C to +125 °C junction operation. Support circuitry includes 22 µF and 1 µF ceramic input/output capacitors, a 511 kΩ / 91 kΩ feedback divider for the PP3V3_FB node, a VBUS-derived enable divider using 93.1 kΩ and 100 kΩ resistors, MODE tied to GND, and a 100 kΩ pull-up from PP3V3 to the power-good output. Intended as a reusable compact 3.3 V buck-boost power-supply module for USB, battery, portable, IoT, or embedded sensor designs.

18 V battery-powered BLDC blower control board using an Arduino Nano, LM2596 5 V buck module, P-channel MOSFET power cutoff, battery voltage sensing, potentiometer input, buzzer, and red/green status LEDs. High-current 18 V blower path is sized for up to 5 A.

Carrier PCB schematic for a four-wheel Arduino Nano ESP32 spy car using two TB6612FNG motor-driver modules, removable Nano sockets, servo/sensor/light/buzzer connectors, and protected shared battery power. PCB layout is intentionally deferred pending module dimensions and electrical ratings.

Isolated 220 VAC to 5 V / 2 A power supply using a certified AC-DC module, with potentiometer-controlled PWM output for a 5 V load. Includes mains input protection and safety documentation assumptions.

USB-C powered consumer temperature/humidity sensor node using a low-power Wi‑Fi + BLE 5.x MCU module, digital T/RH sensor, protected 5 V USB-C input, and 3.3 V regulation.

25 mm circular BLE wearable pendant for ambient-light tracking using an ISP1807 module, AS7343 sensor, USB-C LiPo charging, and SWD programming pads.

Production-oriented 2-layer PCB for a desktop mini CRT-style collectible using an ESP32-C3 Mini module, USB-C LiPo charging, ST7789 TFT display, 3 Hall sensors, eject button, piezo buzzer, and battery monitoring.

Production-oriented 2-layer PCB for a desktop mini CRT-style collectible using an ESP32-C3 Mini module, USB-C LiPo charging, ST7789 TFT display, 3 Hall sensors, eject button, piezo buzzer, and battery monitoring.

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.

Power-section schematic for a 12V DC input generating +4V for a 4G module, +5V, and +3V3 rails with input TVS protection and regulator thermal notes.

Power-section schematic for a 12V DC input generating +4V for a 4G module, +5V, and +3V3 rails with input TVS protection and regulator thermal notes.

Power-section schematic for a 12V DC input generating +4V for a 4G module, +5V, and +3V3 rails with input TVS protection and regulator thermal notes.

Standalone forensic-device mainboard for portable and desktop enclosures, using Raspberry Pi Compute Module direction, IEEE 802.3at PoE+ module power, USB-C power-only input, and a USB write-blocking architecture under review.

Compact USB-C Rechargeable 9V/1A Guitar Pedal Power Supply Module with 18650 Battery

This project is a WiFi Camera with Motion Detection, utilizing ESP32-CAM module and HC-SR501 PIR sensor. The camera is activated by the sensor's output. The system also includes power regulation and communication headers for setup and control. #WiFi #MCU #PIR #ReferenceDesign #project #ESP32 #camera #referenceDesign #edgeComputing #espressif #template #reference-design