# USB-C WiFi BLE T-RH Sensor ## Description 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. ## Project Details - **Owner:** gabrielcarra357 - **Created:** 7/13/2026 - **Last Updated:** 7/13/2026 - **Visibility:** Public - **Domain:** Consumer Electronics - **Connectivity:** Bluetooth - **Software:** Arduino - **Operating Voltage:** 5V - **Power Requirements:** USB ## Key Components ### D1 — [USBLC6-2SC6](https://www.flux.ai/lcsc/usblc6-2sc6~2e9x.md) - JLCPCB Part Class: Extended Part - Breakdown Voltage: 6V - Role Details: Low-capacitance USB D+/D− ESD TVS array near USB-C connector. - Role: Protection - Operating Temperature: -55°C ~ 125°C (TJ) - Manufacturer Name: UMW(友台半导体) - Symbol Style: parametric-v1 - Manufacturer Part Number: USBLC6-2SC6 - Power: 150W - LCSC Part Number: C2687116 - Peak Pulse Current: 5A - Maximum Clamping Voltage: 17V - Part Type: ESD Protection Devices - Datasheet URL: https://www.lcsc.com/datasheet/C2687116.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNRTlhdUVdURFlXXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL **Pins:** - GND [pin 2] - I/O1 [pin 1] - I/O1 [pin 6] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D2 — [TPD1E05U06DPYR](https://www.flux.ai/lcsc/tpd1e05u06dpyr~sh59.md) - Role: Protection - Manufacturer Part Number: TPD1E05U06DPYR - LCSC Part Number: C2937017 - Datasheet URL: https://www.ti.com/lit/ds/symlink/tpd1e05u06.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: DFN1006-2L-RD - Role Details: 5 V VBUS ESD/TVS diode from raw VBUS to GND near USB-C connector. - JLCPCB Part Class: Extended Part - Part Type: ESD and Surge Protection (TVS/ESD) - Manufacturer Name: TPD1E05U06DPYR **Pins:** - A [pin 2] - C [pin 1] ### D3 — [150060VS75000](https://www.flux.ai/silicon-yard/150060vs75000.md) - Package or Case Code: R0603 - Role Details: Low-current status indicator LED, firmware-controlled; place away from SHT40 to avoid heating. - Role: Signal Generation - Part Type: LED - Manufacturer Part Number: 150060VS75000 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/user-uploaded/4785c458b2c53f281c6149dd11617420e108d5d9a5c642541811a66a30135e21.pdf - Manufacturer Name: Würth Elektronik **Pins:** - - [pin 1] - + [pin 2] ### D4 — [TPD1E05U06DPYR](https://www.flux.ai/lcsc/tpd1e05u06dpyr~sh59.md) - Package or Case Code: DFN1006-2L-RD - Part Type: ESD and Surge Protection (TVS/ESD) - JLCPCB Part Class: Extended Part - Role Details: Single-line ESD TVS on CC1 near USB-C connector. - Manufacturer Name: TPD1E05U06DPYR - Role: Protection - Manufacturer Part Number: TPD1E05U06DPYR - LCSC Part Number: C2937017 - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.ti.com/lit/ds/symlink/tpd1e05u06.pdf **Pins:** - A [pin 2] - C [pin 1] ### D5 — [TPD1E05U06DPYR](https://www.flux.ai/lcsc/tpd1e05u06dpyr~sh59.md) - Manufacturer Part Number: TPD1E05U06DPYR - LCSC Part Number: C2937017 - Datasheet URL: https://www.ti.com/lit/ds/symlink/tpd1e05u06.pdf - Role Details: Single-line ESD TVS on CC2 near USB-C connector. - License: https://creativecommons.org/licenses/by/4.0/ - Package or Case Code: DFN1006-2L-RD - JLCPCB Part Class: Extended Part - Part Type: ESD and Surge Protection (TVS/ESD) - Role: Protection - Manufacturer Name: TPD1E05U06DPYR **Pins:** - A [pin 2] - C [pin 1] ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Symbol Style: parametric-v1 - Role: USB-C Receptacle - Manufacturer Name: GCT - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Manufacturer Part Number: USB4105-GF-A - Manufacturer Name: GCT - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: USB C - Role Details: 5 V USB-C sink, USB 2.0 D+/D− routed to ESP32-C3 native USB; CC1/CC2 each need 5.1 kΩ Rd. **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 — [B3FS-1002P](https://www.flux.ai/adrian95/b3fs-1002p.md) - Role Details: Momentary switch pulls EN/CHIP_PU low for reset. - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3fs.pdf - Role: Reset Button - Manufacturer Name: Omron Electronics Inc-EMC Div - Part Type: Electromechanical Components - Manufacturer Part Number: B3FS-1002P **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### SW2 — [B3FS-1002P](https://www.flux.ai/adrian95/b3fs-1002p.md) - Manufacturer Name: Omron Electronics Inc-EMC Div - Manufacturer Part Number: B3FS-1002P - Part Type: Electromechanical Components - License: https://creativecommons.org/licenses/by/4.0/ - Role: Boot Button - Role Details: Momentary switch pulls BOOT/GPIO9 low during reset for ROM download mode. - Datasheet URL: https://omronfs.omron.com/en_US/ecb/products/pdf/en-b3fs.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### 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/ - Role Details: 3.3 V ESP32-C3 module; USB D+/D− for programming; antenna keepout required. - Role: Wi-Fi/BLE MCU module - Part Type: Module - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf - Manufacturer Part Number: ESP32-C3-WROOM-02-N4 - Manufacturer Name: Espressif Systems - Symbol Style: parametric-v1 **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 — [SHT40-AD1B-R3](https://www.flux.ai/cherepanyadima/sht40-ad1b-r3~8q.md) - Manufacturer Name: Sensirion AG - Role Details: SHT40 I2C temperature/humidity sensor, address 0x44, 1.08–3.6 V; place thermally isolated from heat sources. - Datasheet URL: https://sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf - Manufacturer Part Number: SHT40-AD1B-R3 - Part Type: Sensor - Role: Sensing (Shunt) - Symbol Style: parametric-v1 **Pins:** - SCL [pin 2] - SDA [pin 1] - VDD [pin 3] - VSS [pin 4] ### U3 — [TPS25940LRVCR](https://www.flux.ai/lcsc/tps25940lrvcr~hylq.md) - Symbol Style: parametric-v1 - JLCPCB Part Class: Extended Part - LCSC Part Number: C2867756 - Role: Protection - Role Details: TPS25940 eFuse with adjustable OVP/UVLO/OCP, inrush control, and true reverse-current blocking; current limit planned around 0.75 A for default USB-C compatibility margin. - Manufacturer Name: TI(德州仪器) - Manufacturer Part Number: TPS25940LRVCR - Package or Case Code: WQFN-20_L4.0-W3.0-P0.50-BL-EP - Part Type: Integrated Circuit - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps25940.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - ~{FLT} [pin 20] - DEVSLP [pin 1] - dVdT [pin 18] - EN [pin 14] - EP [pin 21] - GND [pin 16] - ILIM [pin 17] - IMON [pin 19] - IN [pin 12] - IN [pin 9] - IN [pin 10] - IN [pin 11] - IN [pin 13] - OUT [pin 5] - OUT [pin 4] - OUT [pin 7] - OUT [pin 6] - OUT [pin 8] - OVP [pin 15] - PGOOD [pin 2] - PGTH [pin 3] ### U4 — [TPS62840DLCR](https://www.flux.ai/lcsc/tps62840dlcr~fpxf.md) - Role: Power Conversion - Role Details: TPS62840 5 V to 3.3 V, 750 mA ultra-low-IQ buck; 2.2 µH inductor, 4.7 µF input, 10 µF output, VSET 267 kΩ for 3.3 V. - Part Type: DC-DC Converters - JLCPCB Part Class: Extended Part - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: TPS62840DLCR - LCSC Part Number: C2071859 - Manufacturer Name: TI(德州仪器) - Datasheet URL: https://www.lcsc.com/datasheet/C2071859.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNRTlhaX1NSQlVfVzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Symbol Style: parametric-v1 - Package or Case Code: VSON-8_L2.0-W1.5-P0.50-BL **Pins:** - EN [pin 4] - GND [pin 1] - MODE [pin 3] - STOP [pin 6] - SW [pin 7] - VIN [pin 2] - VOS [pin 8] - VSET [pin 5] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/gabrielcarra357/usb-c-wifi-ble-t-rh-sensor~79](https://www.flux.ai/gabrielcarra357/usb-c-wifi-ble-t-rh-sensor~79).* --- *Generated from [https://www.flux.ai/gabrielcarra357/usb-c-wifi-ble-t-rh-sensor~79](https://www.flux.ai/gabrielcarra357/usb-c-wifi-ble-t-rh-sensor~79)*