# USB-C WiFi BLE Sensor Node ## Description Low-power consumer temperature/humidity sensor node using USB-C 5 V input, protected 3.3 V power, and an ESP32-class Wi-Fi/BLE 5.x module. ## Project Details - **Owner:** dastardlydog - **Created:** 6/14/2026 - **Last Updated:** 6/14/2026 - **Visibility:** Public ## Key Components ### D1 — [USBLC6-2P6](https://www.flux.ai/lcsc/usblc6-2p6~ubvn.md) - Manufacturer Part Number: USBLC6-2P6 - Manufacturer Name: TECH PUBLIC(台舟) - JLCPCB Part Class: Extended Part - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/C2827693.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VeUFNeTlhdXjsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Part Type: ESD Protection Devices - Role Details: USB2 D+/D- ESD clamp near USB-C receptacle before ESP32 pins. - Role: ESD Protection - Package or Case Code: SOT-666-6_L1.6-W1.2-P0.50-LS1.6-BL - LCSC Part Number: C2827693 - Symbol Style: parametric-v1 **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-C190KRKT](https://www.flux.ai/adrian95/ltst-c190krkt~3pw.md) - Datasheet URL: https://optoelectronics.liteon.com/upload/download/DS-22-99-0151/LTST-C190KRKT.pdf - Role: Status LED - Role Details: GPIO-driven low-current status indicator. - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: LED - Manufacturer Name: Lite-On Inc. - Manufacturer Part Number: LTST-C190KRKT **Pins:** - A [pin 2] - K [pin 1] ### J1 — [USB4215-03-A](https://www.flux.ai/adrian95/usb4215-03-a~kg3.md) - Role: USB-C Receptacle - Package or Case Code: GCT_USB4215-03-A_REVA - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: USB-C sink input; 5 V default VBUS, CC pull-downs, USB2 D+/D- to ESP32-S3 native USB. - Part Type: USB C - Datasheet URL: https://gct.co/files/specs/usb4215-spec.pdf - Manufacturer Name: GCT - Symbol Style: parametric-v1 - Manufacturer Part Number: USB4215-03-A **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] ### SW1 — [FSM1LP](https://www.flux.ai/adrian95/fsm1lp.md) - Role: BOOT Button - Part Type: Electromechanical Components - Manufacturer Part Number: FSM1LP - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: TE Connectivity - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Catalog+Section%7F1308111-1_SWITCHES_CORE_PROGRAM_CATALOG%7F0308%7Fpdf%7FEnglish%7FENG_CS_1308111-1_SWITCHES_CORE_PROGRAM_CATALOG_0308.pdf%7F1-1437565-6 - Role Details: Momentary switch pulls BOOT/GPIO0 low for download mode. **Pins:** - COM_1 [pin 1] - COM_2 [pin 2] - GND [pin 5] - NO_1 [pin 3] - NO_2 [pin 4] ### SW2 — [FSM1LP](https://www.flux.ai/adrian95/fsm1lp.md) - Manufacturer Name: TE Connectivity - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=showdoc&DocId=Catalog+Section%7F1308111-1_SWITCHES_CORE_PROGRAM_CATALOG%7F0308%7Fpdf%7FEnglish%7FENG_CS_1308111-1_SWITCHES_CORE_PROGRAM_CATALOG_0308.pdf%7F1-1437565-6 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Electromechanical Components - Manufacturer Part Number: FSM1LP - Role Details: Momentary switch pulls EN/CHIP_PU low to reset ESP32. - Role: RESET Button **Pins:** - COM_1 [pin 1] - COM_2 [pin 2] - GND [pin 5] - NO_1 [pin 3] - NO_2 [pin 4] ### U1 — [ESP32-S3-WROOM-1-N16R8](https://www.flux.ai/lcsc/esp32-s3-wroom-1-n16r8~s9kh.md) - JLCPCB Part Class: Extended Part - LCSC Part Number: C2913202 - Part Type: RF Transceiver - Current - Transmitting: 285mA ~ 355mA - Symbol Style: parametric-v1 - Supply Voltage: 3V ~ 3.6V - Package or Case Code: WIRELM-SMD_ESP32-S3-WROOM-1 - Role: MCU / Wireless Module - Operating Temperature: -40°C ~ 65°C (TA) - Manufacturer Part Number: ESP32-S3-WROOM-1-N16R8 - Current - Receiving: 95mA ~ 97mA - Manufacturer Name: ESPRESSIF(乐鑫) - Role Details: ESP32-S3 low-power Wi-Fi/BLE 5.x module; 3.3 V rail peak budget 500 mA for radio bursts. - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://www.lcsc.com/datasheet/C2913202.pdf?spm=wm.sxq.inf.ggs&lcsc_vid=FlkNBAIDRQULVABfFAVZBgZVFVZYBgZSQ1NeBVIFQlExVlNeR1VXVlNfRlBfUzsOAxUeFF5JWBYZEEoKFBINSQcJGk4dAgUUFAk%3D - Frequency: 2.4GHz **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 47] - GND [pin 41] - GND [pin 45] - GND [pin 40] - GND [pin 48] - GND [pin 49] - GND [pin 44] - GND [pin 46] - GND [pin 42] - GND [pin 1] - GND [pin 43] - IO0 [pin 27] - IO1 [pin 39] - IO10 [pin 18] - IO11 [pin 19] - IO12 [pin 20] - IO13 [pin 21] - IO14 [pin 22] - IO15 [pin 8] - IO16 [pin 9] - IO17 [pin 10] - IO18 [pin 11] - IO19 [pin 13] - IO2 [pin 38] - IO20 [pin 14] - IO21 [pin 23] - IO3 [pin 15] - IO35 [pin 28] - IO36 [pin 29] - IO37 [pin 30] - IO38 [pin 31] - IO39 [pin 32] - IO4 [pin 4] - IO40 [pin 33] - IO41 [pin 34] - IO42 [pin 35] - IO45 [pin 26] - IO46 [pin 16] - IO47 [pin 24] - IO48 [pin 25] - IO5 [pin 5] - IO6 [pin 6] - IO7 [pin 7] - IO8 [pin 12] - IO9 [pin 17] - RXD0 [pin 36] - TXD0 [pin 37] ### U2 — [SHT41-AD1B-R3](https://www.flux.ai/adrian95/sht41-ad1b-r3~bec.md) - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: I2C T/RH sensor powered from 3.3 V for environmental measurement. - Manufacturer Name: Sensirion - Part Type: Sensors - Datasheet URL: https://sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf - Role: Temperature/Humidity Sensor - Manufacturer Part Number: SHT41-AD1B-R3 **Pins:** - SCL [pin 2] - SDA [pin 1] - VDD [pin 3] - VSS [pin 4] ### U3 — [TPS25940LRVCR](https://www.flux.ai/lcsc/tps25940lrvcr~hylq.md) - Manufacturer Part Number: TPS25940LRVCR - Datasheet URL: ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftps25940 - LCSC Part Number: C2867756 - JLCPCB Part Class: Extended Part - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ - Role: Input Protection eFuse - Role Details: Protected 5 V rail sized for USB-C default sources; adjustable OCP target around 1 A with 0.6–5.3 A IC capability. - Manufacturer Name: TI(德州仪器) - Symbol Style: parametric-v1 - Package or Case Code: WQFN-20_L4.0-W3.0-P0.50-BL-EP **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 — [AP63203WU-7](https://www.flux.ai/lcsc/ap63203wu-7~j9cl.md) - Frequency: 1100kHz - Role: 3.3V Buck Regulator - Output Current: 2A - Part Type: AC-DC Controllers & Regulators - Symbol Style: parametric-v1 - Package or Case Code: TSOT-26_L2.9-W1.6-P0.95-LS2.8-BL - Operating Voltage: 4.5V to 60V - IC Type: Synchronous Buck Converter - Operating Temperature: -40 ~ +85℃ - LCSC Part Number: C780769 - Manufacturer Part Number: AP63203WU-7 - Max Output Voltage: 3.3V - JLCPCB Part Class: Extended Part - Manufacturer Name: DIODES(美台) - Max Input Voltage: 3.8~32V - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP63200-AP63201-AP63203-AP63205.pdf - Role Details: 2 A fixed 3.3 V buck, low-IQ; supports ~520 mA 3.3 V peak system load with margin. **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/dastardlydog/usb-c-wifi-ble-sensor-node~c3](https://www.flux.ai/dastardlydog/usb-c-wifi-ble-sensor-node~c3).* --- *Generated from [https://www.flux.ai/dastardlydog/usb-c-wifi-ble-sensor-node~c3](https://www.flux.ai/dastardlydog/usb-c-wifi-ble-sensor-node~c3)*