# USB-C WiFi BLE Environmental Sensor Node ## Description Consumer USB-C powered temperature/humidity sensor node using a low-power Wi‑Fi + BLE MCU, protected 5 V input, and 3.3 V sensing/control rail. ## Project Details - **Owner:** angierg27 - **Created:** 6/30/2026 - **Last Updated:** 6/30/2026 - **Visibility:** Public - **Power Requirements:** USB-C - **Domain:** IoT - **Compliance:** Consumer - **Connectivity:** Bluetooth - **Operating Voltage:** 5V - **Connectivity:** Wi-Fi ## Key Components ### D1 — [USBLC6-2SC6](https://www.flux.ai/lcsc/usblc6-2sc6~2e9x.md) - Manufacturer Name: UMW(友台半导体) - Package or Case Code: SOT-23-6_L2.9-W1.6-P0.95-LS2.8-BL - Role: USB ESD Protection - Maximum Clamping Voltage: 17V - Breakdown Voltage: 6V - Power: 150W - Peak Pulse Current: 5A - Datasheet URL: https://www.lcsc.com/datasheet/C2687116.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNRTlhdUVdURFlXXzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - LCSC Part Number: C2687116 - Operating Temperature: -55°C ~ 125°C (TJ) - JLCPCB Part Class: Extended Part - Part Type: ESD Protection Devices - Role Details: Protects D+/D− near USB-C connector before traces reach MCU. - Symbol Style: parametric-v1 - Manufacturer Part Number: USBLC6-2SC6 **Pins:** - GND [pin 2] - I/O1 [pin 1] - I/O1 [pin 6] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### J1 — [USB4215-03-A](https://www.flux.ai/adrian95/usb4215-03-a~kg3.md) - Manufacturer Part Number: USB4215-03-A - Package or Case Code: GCT_USB4215-03-A_REVA - Manufacturer Name: GCT - Role: USB-C Receptacle - Datasheet URL: https://gct.co/files/specs/usb4215-spec.pdf - Role Details: Sink-only USB-C default 5 V input using independent CC1/CC2 Rd pulldowns. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: USB C - Symbol Style: parametric-v1 **Pins:** - CC1 [pin A5] - CC2 [pin B5] - DN1 [pin A7] - DN2 [pin B7] - DP1 [pin A6] - DP2 [pin B6] - GND_A [pin A1_B12] - GND_B [pin B1_A12] - SBU1 [pin A8] - SBU2 [pin B8] - SHIELD [pin SH1] - SHIELD [pin SH4] - SHIELD [pin SH2] - SHIELD [pin SH3] - VBUS_A [pin A4_B9] - VBUS_B [pin B4_A9] ### LED1 — [150060VS55040](https://www.flux.ai/adrian95/150060vs55040~c2q.md) - Part Type: LED - Role: Status LED - Role Details: Firmware-controlled low-duty status indicator; keep off during low-power operation. - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.we-online.com/components/products/datasheet/150060VS55040.pdf - Manufacturer Part Number: 150060VS55040 - Manufacturer Name: Würth Elektronik **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - Part Type: Tactile Switches - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - JLCPCB Part Class: Extended Part - LCSC Part Number: C720477 - Product Info Url: https://lcsc.com/product-detail/Tactile-Switches_XUNPU-TS-1088-AR02016_C720477.html - Package or Case Code: SW-SMD_L3.9-W3.0-P4.45 - Role Details: Momentary switch pulls ESP32-C3 GPIO9/BOOT low for programming mode. - Manufacturer Part Number: TS-1088-AR02016 - Manufacturer Name: XUNPU(讯普) - Role: BOOT Button **Pins:** - 1 [pin 1] - 2 [pin 2] ### SW2 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - Part Type: Tactile Switches - Role: RESET Button - Role Details: Momentary switch pulls EN/CHIP_PU low for reset. - 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 - Package or Case Code: SW-SMD_L3.9-W3.0-P4.45 - Product Info Url: https://lcsc.com/product-detail/Tactile-Switches_XUNPU-TS-1088-AR02016_C720477.html - Manufacturer Name: XUNPU(讯普) - Manufacturer Part Number: TS-1088-AR02016 **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) - 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 - Role: Wi-Fi/BLE MCU module - Part Type: Module - Symbol Style: parametric-v1 - Manufacturer Name: Espressif Systems - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: Chosen over ESP32-S3 for lower power/cost; sufficient for USB-powered temp/RH telemetry and BLE provisioning. **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) - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: SHT41-AD1B-R3 - Role: Temperature/Humidity Sensor - Datasheet URL: https://sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf - Manufacturer Name: Sensirion - Role Details: I2C digital T/RH sensor; place away from regulator/MCU heat sources and ventilate enclosure. - Part Type: Sensors **Pins:** - SCL [pin 2] - SDA [pin 1] - VDD [pin 3] - VSS [pin 4] ### U3 — [TPS259530DSGR](https://www.flux.ai/lcsc/tps259530dsgr~9ds.md) - JLCPCB Part Class: Extended Part - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps2595.pdf - Part Type: Integrated Circuit - Role Details: 2.7–18 V eFuse with adjustable OCP/OVP/UVLO; current limit should be set near 0.75–1 A for this low-power node rather than blindly assuming 3 A. - Package or Case Code: WSON-8_L2.0-W2.0-P0.50-TL-EP - Manufacturer Part Number: TPS259530DSGR - Manufacturer Name: Texas Instruments - Role: Input eFuse - LCSC Part Number: C2155775 **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 — [MP28301GG-P](https://www.flux.ai/monolithicpower/mp28301gg-p~4f6.md) - Package or Case Code: QFN-2x2_MP28301_MNP - Manufacturer Name: Monolithic Power Systems - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP28301 - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/2983?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Role Details: 700 mA buck selected for ESP32-C3 Wi-Fi current bursts and lower heat than 5 V to 3.3 V LDO. - Role: 3.3V Buck Regulator - Manufacturer Part Number: MP28301GG-P - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/m/p/mp28301_tac.jpg **Pins:** - CTRL1 [pin 2] - CTRL2 [pin 3] - CTRL3 [pin 4] - CTRL4 [pin 5] - CTRL5 [pin 6] - GND [pin 8] - OUT1 [pin 1] - OUT2 [pin 12] - PG1 [pin 7] - SW [pin 9] - VIN1 [pin 10] - VIN2 [pin 11] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/angierg27/usb-c-wifi-ble-environmental-sensor-node~o9](https://www.flux.ai/angierg27/usb-c-wifi-ble-environmental-sensor-node~o9).* --- *Generated from [https://www.flux.ai/angierg27/usb-c-wifi-ble-environmental-sensor-node~o9](https://www.flux.ai/angierg27/usb-c-wifi-ble-environmental-sensor-node~o9)*