# USB-C WiFi BLE T-RH Sensor Node ## Description 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. ## Project Details - **Owner:** rodrigosolis-tech - **Created:** 5/17/2026 - **Last Updated:** 5/17/2026 - **Visibility:** Public - **Domain:** Consumer Electronics - **Operating Voltage:** 5V - **Connectivity:** 2.4 GHz 802.11 b/g/n Wi-Fi and BLE 5.x - **Implementation Details:** Low-power environmental T/RH node with USB-C sink CC pull-downs, input reverse/OVP/UVLO/OCP protection, 3.3V regulation, ESP32-class module, digital I2C temperature/humidity sensor, programming/debug USB, boot/reset controls, and status LED. - **Power Requirements:** USB-C 5V sink input; default 5V current advertisement supported from 0.5A to 3A sources; protected 3.3V internal rail. ## Key Components ### J1 — [B2B-PH-K-S](https://www.flux.ai/adrian95/b2b-ph-k-s~fx.md) - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf - Package or Case Code: JST_B2B-PH-K-S - Manufacturer Name: JST - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Manufacturer Part Number: B2B-PH-K-S **Pins:** - 1 [pin 1] - 2 [pin 2] ### J2 — [Pin Header 01x04 2.54mm Vertical i2c](https://www.flux.ai/hasanbasri93/pin-header-01x04-2p54mm-vertical-i2c~37.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector **Pins:** - 5V [pin 1] - GND [pin 2] - SCL [pin 4] - SDA [pin 3] ### U1 — [Seeed Studio XIAO ESP32S3](https://www.flux.ai/seeedstudio/seeed-studio-xiao-esp32s3~jt.md) - Datasheet URL: https://files.seeedstudio.com/wiki/SeeedStudio-XIAO-ESP32S3/res/esp32-s3_datasheet.pdf - Manufacturer Part Number: 113991114 - Purchase Url: https://www.seeedstudio.com/XIAO-ESP32S3-p-5627.html - Product Info Url: https://wiki.seeedstudio.com/xiao_esp32s3_getting_started/ - Manufacturer Name: Seeed Studio - Part Type: Microcontroller **Pins:** - 3V3 [pin 12] - 5V [pin 14] - D10_A10_MOSI_GPIO9_TOUCH9 [pin 11] - D7_RX_GPIO44 [pin 8] - D8_A8_SCK_GPIO7_TOUCH7 [pin 9] - D9_A9_MISO_GPIO8_TOUCH8 [pin 10] - GND [pin 13] - GPIO43_TX_D6 [pin 7] - TOUCH1_GPIO1_A0_D0 [pin 1] - TOUCH2_GPIO2_A1_D1 [pin 2] - TOUCH3_GPIO3_A2_D2 [pin 3] - TOUCH4_GPIO4_A3_D3 [pin 4] - TOUCH5_GPIO5_SDA_A4_D4 [pin 5] - TOUCH6_GPIO6_SCL_A5_D5 [pin 6] ### U2 — [ADXL355BEZ](https://www.flux.ai/adrian95/adxl355bez~v0.md) - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ADXL354BEZ - Part Type: Sensor - Datasheet URL: https://www.analog.com/media/en/technical-documentation/data-sheets/adxl354_adxl355.pdf - Manufacturer Name: Analog Devices Inc. **Pins:** - CS/SCL [pin 1] - DRDY [pin 14] - INT1 [pin 12] - INT2 [pin 13] - MISO/ASEL [pin 4] - MOSI/SDA [pin 3] - RESERVED [pin 7] - SCLK/VSSIO [pin 2] - V1P8ANA [pin 10] - V1P8DIG [pin 8] - VDDIO [pin 5] - VSS [pin 9] - VSSIO [pin 6] - VSUPPLY [pin 11] ### U4 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1~zlq.md) - Symbol Style: parametric-v1 - Part Type: Integrated Circuit - Role: 3.3V Regulator - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Fixed 3.3V LDO; requires input and output capacitors; 600mA min output - Manufacturer Name: Diodes Incorporated - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Manufacturer Part Number: AP2112K-3.3TRG1 **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/rodrigosolis-tech/usb-c-wifi-ble-t-rh-sensor-node~nh](https://www.flux.ai/rodrigosolis-tech/usb-c-wifi-ble-t-rh-sensor-node~nh).* --- *Generated from [https://www.flux.ai/rodrigosolis-tech/usb-c-wifi-ble-t-rh-sensor-node~nh](https://www.flux.ai/rodrigosolis-tech/usb-c-wifi-ble-t-rh-sensor-node~nh)*