# USB-C ESP32 Environmental Sensor ## Description USB-C powered low-power temperature and humidity sensor node using an ESP32 Wi‑Fi/BLE module, digital T/RH sensor, protected 5V input, and 3.3V system rail for consumer environmental monitoring. ## Project Details - **Owner:** dhruvdhruv - **Created:** 6/15/2026 - **Last Updated:** 6/15/2026 - **Visibility:** Public ## Key Components ### D1 — [USBLC6-2P6](https://www.flux.ai/lcsc/usblc6-2p6~ubvn.md) - Role Details: Protects USB D+ and D- between connector and ESP32-C3 USB pins. - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: USBLC6-2P6 - LCSC Part Number: C2827693 - Package or Case Code: SOT-666-6_L1.6-W1.2-P0.50-LS1.6-BL - Role: ESD Protection - Part Type: ESD Protection Devices - Datasheet URL: https://www.lcsc.com/datasheet/C2827693.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VeUFNeTlhdXjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Manufacturer Name: TECH PUBLIC(台舟) - JLCPCB Part Class: Extended Part **Pins:** - GND [pin 2] - I/O1 [pin 6] - I/O1 [pin 1] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D2 — [LTST-S270GKT](https://www.flux.ai/jecstronic/ltst-s270gkt~r84.md) - Role Details: Firmware-controlled status LED on GPIO3 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Lite-On Inc. - Part Type: LED - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/1060/LTST-S270GKT.pdf - Manufacturer Part Number: LTST-S270GKT - Role: Signal Generation **Pins:** - A [pin 2] - K [pin 1] ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: GCT - Connector Type: USB-C Receptacle - Manufacturer Name: GCT - Manufacturer Part Number: USB4105-GF-A - Part Type: USB C - Role: USB-C Power/Data Input - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND [pin A1_B12] - GND__1 [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHELL_GND [pin SH1] - SHELL_GND__1 [pin SH2] - SHELL_GND__2 [pin SH3] - SHELL_GND__3 [pin SH4] - VBUS [pin A4_B9] - VBUS__1 [pin B4_A9] ### SW1 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - Product Info Url: https://lcsc.com/product-detail/Tactile-Switches_XUNPU-TS-1088-AR02016_C720477.html - LCSC Part Number: C720477 - JLCPCB Part Class: Extended Part - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - Manufacturer Name: XUNPU(讯普) - Package or Case Code: SW-SMD_L3.9-W3.0-P4.45 - Manufacturer Part Number: TS-1088-AR02016 - Part Type: Tactile Switches - Role: Switching - Role Details: Manual reset button for ESP32-C3 EN **Pins:** - 1 [pin 1] - 2 [pin 2] ### SW2 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - Role Details: Manual bootloader button for ESP32-C3 GPIO9 - Part Type: Tactile Switches - Manufacturer Part Number: TS-1088-AR02016 - Product Info Url: https://lcsc.com/product-detail/Tactile-Switches_XUNPU-TS-1088-AR02016_C720477.html - Manufacturer Name: XUNPU(讯普) - Role: Switching - Package or Case Code: SW-SMD_L3.9-W3.0-P4.45 - LCSC Part Number: C720477 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [ESP32-C3-WROOM-02-N4](https://www.flux.ai/adrian95/esp32-c3-wroom-02-n4~gwb.md) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Espressif Systems - Connectivity: 2.4GHz Wi-Fi 802.11 b/g/n + BLE 5.x - Operating Voltage: 3.3V - Role: MCU / Wireless Module - Symbol Style: parametric-v1 - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf - Part Type: Module - Manufacturer Part Number: ESP32-C3-WROOM-02-N4 **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-R2](https://www.flux.ai/adrian95/sht41-ad1b-r2.md) - Manufacturer Part Number: SHT41-AD1B-R2 - Manufacturer Name: Sensirion - Part Type: Sensors - Operating Voltage: 3.3V - License: https://creativecommons.org/licenses/by/4.0/ - Role: Temperature / Humidity Sensor - Datasheet URL: https://sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf **Pins:** - SCL [pin 2] - SDA [pin 1] - VDD [pin 3] - VSS [pin 4] ### U3 — [TPS259530DSGR](https://www.flux.ai/lcsc/tps259530dsgr~9ds.md) - LCSC Part Number: C2155775 - Package or Case Code: WSON-8_L2.0-W2.0-P0.50-TL-EP - JLCPCB Part Class: Extended Part - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps2595.pdf - Manufacturer Name: Texas Instruments - Role Details: Sized for ~0.31A expected peak load with configurable current limit; protects 5V VBUS path for 0.5–3A USB-C sources. - Manufacturer Part Number: TPS259530DSGR - Role: Input Protection eFuse - Part Type: Integrated Circuit **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 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1~zlq.md) - Symbol Style: parametric-v1 - Manufacturer Name: Diodes Incorporated - Role Details: 3.3V rail expected ~155mA active typical and ~305mA peak Wi-Fi transient; 600mA regulator rating selected. - License: https://creativecommons.org/licenses/by/4.0/ - Role: 3.3V LDO Regulator - Manufacturer Part Number: AP2112K-3.3TRG1 - Part Type: Integrated Circuit - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf **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/dhruvdhruv/usb-c-esp32-environmental-sensor~x7](https://www.flux.ai/dhruvdhruv/usb-c-esp32-environmental-sensor~x7).* --- *Generated from [https://www.flux.ai/dhruvdhruv/usb-c-esp32-environmental-sensor~x7](https://www.flux.ai/dhruvdhruv/usb-c-esp32-environmental-sensor~x7)*