# USB-C WiFi BLE Environmental Sensor ## Description 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. ## Project Details - **Owner:** inar - **Created:** 5/26/2026 - **Last Updated:** 5/26/2026 - **Visibility:** Public ## Key Components ### D1 — [USBLC6-4SC6](https://www.flux.ai/kicad-part-library/usblc6-4sc6~cr3.md) - Part Type: Protection - Datasheet URL: https://www.st.com/resource/en/datasheet/usblc6-4.pdf - Manufacturer Name: Texas Instruments Inc. - Role: Protection - Package or Case Code: SOT-23-6 - Manufacturer Part Number: USBLC6-4SC6 - Role Details: ESD clamp for USB-C data and VBUS-adjacent exposed connector lines. **Pins:** - GND [pin 2] - I/O1 [pin 1] - I/O2 [pin 3] - I/O3 [pin 4] - I/O4 [pin 6] - VBUS [pin 5] ### D2 — [Generic LED SMD](https://www.flux.ai/jharwinbarrozo/generic-led-smd~ku.md) - Part Type: LED - Role Details: Firmware-controlled low-current status indicator. - Package: LED_0603_1608Metric - Role: Signal Generation **Pins:** - A [pin 2] - K [pin 1] ### J1 — [USB-C 2.0 Receptacle](https://www.flux.ai/vasy_skral/usb-c-2p0-receptacle~1xw.md) - Role: Power Filtering - Manufacturer Name: GTC - Part Type: USB C - Manufacturer Part Number: USB4105-GF-A - Symbol Style: parametric-v1 - Datasheet URL: https://gct.co/files/drawings/usb4105.pdf - Role Details: USB-C 5V default sink input and native USB data path to MCU. - Purchase Url: https://www.digikey.com/en/products/detail/gct/USB4105-GF-A/11198441 **Pins:** - CC1 [pin 6] - CC2 [pin 12] - D- [pin 7] - D- [pin 9] - D+ [pin 10] - D+ [pin 8] - GND [pin 1] - GND [pin 16] - GND [pin 15] - GND [pin 2] - SBU1 [pin 11] - SBU2 [pin 5] - VBUS [pin 3] - VBUS [pin 14] - VBUS [pin 4] - VBUS [pin 13] ### SW1 — [Tactile Switch SPST-NO PTS526 SK15 SMTR2 LFS](https://www.flux.ai/collinsemasi/tactile-switch-spst-no-pts526-sk15-smtr2-lfs~83.md) - Role Details: Manual reset button pulls MCU EN low. - Role: Switching - Manufacturer Part Number: PTS526 SK15 SMTR2 LFS - Datasheet URL: https://www.ckswitches.com/media/2780/pts526.pdf - Part Type: Switch - Manufacturer Name: C&K **Pins:** - 2 [pin 2] - 4 [pin 4] - 1 [pin 1] - 3 [pin 3] ### SW2 — [Tactile Switch SPST-NO PTS526 SK15 SMTR2 LFS](https://www.flux.ai/collinsemasi/tactile-switch-spst-no-pts526-sk15-smtr2-lfs~83.md) - Role: Switching - Part Type: Switch - Role Details: Manual boot/download button pulls GPIO9/BOOT low during reset. - Manufacturer Name: C&K - Manufacturer Part Number: PTS526 SK15 SMTR2 LFS - Datasheet URL: https://www.ckswitches.com/media/2780/pts526.pdf **Pins:** - 2 [pin 2] - 4 [pin 4] - 1 [pin 1] - 3 [pin 3] ### U1 — [ESP32-C3-WROOM-02-N4](https://www.flux.ai/adrian95/esp32-c3-wroom-02-n4~gwb.md) - Symbol Style: parametric-v1 - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf - Role Details: Main MCU with 2.4GHz Wi-Fi 802.11 b/g/n and BLE 5.x for the environmental node. - Manufacturer Part Number: ESP32-C3-WROOM-02-N4 - Role: Modulation / Demodulation - Part Type: Module - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Espressif Systems **Pins:** - 3V3 [pin 1] - EN [pin 2] - GND_1 [pin 9] - GND_10 [pin 27] - GND_2 [pin 19] - GND_3 [pin 20] - GND_4 [pin 21] - GND_5 [pin 22] - GND_6 [pin 23] - GND_7 [pin 24] - GND_8 [pin 25] - GND_9 [pin 26] - IO0 [pin 18] - IO1 [pin 17] - IO10 [pin 10] - IO18 [pin 13] - IO19 [pin 14] - IO2 [pin 16] - IO3 [pin 15] - IO4 [pin 3] - IO5 [pin 4] - IO6 [pin 5] - IO7 [pin 6] - IO8 [pin 7] - IO9 [pin 8] - RXD [pin 11] - TXD [pin 12] ### U2 — [SHT41-AD1B-R3](https://www.flux.ai/adrian95/sht41-ad1b-r3~bec.md) - Datasheet URL: https://sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Sensors - Manufacturer Name: Sensirion - Role: Sensing (Shunt) - Manufacturer Part Number: SHT41-AD1B-R3 - Role Details: I2C temperature and relative humidity measurement sensor placed away from heat sources. **Pins:** - SCL [pin 2] - SDA [pin 1] - VDD [pin 3] - VSS [pin 4] ### U3 — [TPS259530DSGR](https://www.flux.ai/lcsc/tps259530dsgr~9ds.md) - Role: Protection - Manufacturer Part Number: TPS259530DSGR - Manufacturer Name: Texas Instruments - Role Details: USB-C VBUS eFuse sized from 600mA peak load target, with current limit configured near 1A for 0.5–3A source compatibility. - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps2595.pdf - LCSC Part Number: C2155775 - JLCPCB Part Class: Extended Part - Part Type: Integrated Circuit - Package or Case Code: WSON-8_L2.0-W2.0-P0.50-TL-EP **Pins:** - ~{FLT} [pin 6] - dVdt [pin 1] - EN/UVLO [pin 2] - EP [pin 9] - GND [pin 8] - ILM [pin 7] - IN [pin 3] - IN [pin 4] - OUT [pin 5] ### U4 — [AP63203WU-7](https://www.flux.ai/adrian95/ap63203wu-7~o8a.md) - Manufacturer Part Number: AP63203WU-7 - Manufacturer Name: Diodes Incorporated - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP63200-AP63201-AP63203-AP63205.pdf - Role Details: Fixed 3.3V buck regulator selected to avoid feedback divider and provide >600mA ESP32 peak-current margin. - Role: Power Conversion - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit **Pins:** - BST [pin 6] - EN [pin 2] - FB [pin 1] - GND [pin 4] - SW [pin 5] - VIN [pin 3] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/inar/usb-c-wifi-ble-environmental-sensor~8m](https://www.flux.ai/inar/usb-c-wifi-ble-environmental-sensor~8m).* --- *Generated from [https://www.flux.ai/inar/usb-c-wifi-ble-environmental-sensor~8m](https://www.flux.ai/inar/usb-c-wifi-ble-environmental-sensor~8m)*