Consumer USB-C powered low-power environmental sensor node with digital temperature/humidity sensing, ESP32-class Wi-Fi/BLE 5.x connectivity, and protected 5V USB-C input for 0.5–3A sources.

USB-C powered consumer environmental sensor node with ESP32-class Wi‑Fi/Bluetooth, digital temperature/humidity sensing, protected 5 V input, and 3.3 V low-power electronics.

Consumer USB-C powered environmental sensor node with ESP32-class Wi-Fi/BLE, digital temperature/humidity sensing, protected 5 V input, and low-power 3.3 V architecture.

USB-C powered low-power environmental sensor node with ESP32 Wi-Fi/Bluetooth, digital temperature/humidity sensing, and protected 5 V input for consumer use.

USB-C powered low-power environmental sensor node with ESP32-class Wi-Fi/BLE, digital temperature/humidity sensing, USB-C 5V sink input, and protected 3.3V power rail.

Low-power USB-C environmental sensor node with ESP32 Wi-Fi/BLE, digital temperature/humidity sensing, and protected 5 V input power path.

Consumer USB-C powered low-power environmental sensor node with WiFi/BLE MCU, digital temperature/humidity sensing, USB-C 5 V input, and input protection for 0.5–3 A sources.

USB-C powered low-power consumer environmental sensor node with Wi-Fi/Bluetooth connectivity, digital temperature/humidity sensing, protected 5 V input, and 3.3 V system rail.

Low-power consumer environmental sensor node with ESP32-S3 Wi-Fi/BLE, digital temperature/humidity sensing, USB-C 5 V default-sink input, reverse/OVP/UVLO/OCP protection, and regulated 3.3 V power for 0.5–3 A USB-C sources.

USB-C powered consumer environmental sensor node with ESP32-class Wi‑Fi/BLE connectivity, digital temperature/humidity sensing, protected 5 V input, and low-power 3.3 V electronics.

Consumer USB-C powered low-power environmental sensor node with Wi-Fi, Bluetooth LE, digital temperature/humidity sensing, and protected 5 V input supporting 0.5–3 A USB-C sources.

USB-C powered consumer environmental sensor node with Wi-Fi, Bluetooth LE, digital temperature/humidity sensing, and protected 5 V input power path.

Consumer USB-C powered low-power temperature and humidity sensor node with Wi-Fi/BLE connectivity, I2C digital T/RH sensing, and protected 5 V input power management.

USB-C powered low-power temperature/humidity sensor node with ESP32-class Wi‑Fi/BLE 5.x connectivity, digital T/RH sensing, USB-C 5 V sink input, and protected 3.3 V power path sized for 0.5–3 A sources.

Low-power USB-C environmental sensor node using a dual-radio Wi‑Fi/BLE MCU, digital temperature/humidity sensing, protected 5 V USB-C input, and 3.3 V regulation for consumer use.

Low-power USB-C powered environmental sensor node with Wi-Fi 802.11 b/g/n, BLE 5.x, digital temperature/humidity sensing, and protected 5 V USB-C input for 0.5–3 A sources.

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.

Low-power consumer environmental sensor node with USB-C 5V input, Wi-Fi + Bluetooth connectivity, digital temperature/humidity sensing, and protected 5V-to-3.3V power architecture including reverse, OVP, UVLO, and OCP considerations.

USB-C powered low-power temperature and humidity sensor node with WiFi, Bluetooth LE, protected 5 V input, and digital environmental sensing.

USB-C powered low-power environmental sensor node with Wi-Fi, Bluetooth LE, protected 5 V input, 3.3 V regulation, and digital temperature/humidity sensing for consumer use.

Low-power USB-C 5V environmental temperature/humidity sensor node with Wi-Fi 2.4GHz b/g/n and BLE 5.x connectivity, protected 5V input, and 3.3V digital sensor/MCU rail.

Consumer USB-C powered environmental sensor node with protected 5V input, 3.3V regulation, WiFi/BLE MCU, and digital temperature/humidity sensing.

A general infrared proximity sensor circuit that can be interfaced with any microcontroller (e.g., Arduino, ESP, etc.). It uses a transmitter (IR LED) and a receiver (photodiode) along with a comparator circuit (LM393N/NOPB) to sense objects. The circuit outputs a digital signal (high/low) based on the sensor's response.

RP2040 is a low-cost, high-performance microcontroller device with flexible digital interfaces. Key features: • Dual Cortex M0+ processor cores, up to 133 MHz • 264 kB of embedded SRAM in 6 banks • 30 multifunction GPIO • 6 dedicated IO for SPI Flash (supporting XIP) • Dedicated hardware for commonly used peripherals • Programmable IO for extended peripheral support • 4 channel ADC with internal temperature sensor, 0.5 MSa/s, 12-bit conversion • USB 1.1 Host/Device

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.