# USB-C WiFi BLE T-RH Sensor Node ## Description Low-power consumer temperature/humidity sensor node powered from USB-C 5V, using a Wi-Fi + BLE 5.x MCU, digital T/RH sensor, USB-C sink configuration, protected 5V input path, and efficient 3.3V regulation. ## Project Details - **Owner:** monkeybites - **Created:** 5/21/2026 - **Last Updated:** 5/21/2026 - **Visibility:** Public ## Key Components ### D1 — [USBLC6-2SC6](https://www.flux.ai/vasy_skral/usblc6-2sc6~g1b.md) - Manufacturer Part Number: USBLC6-2SC6 - Datasheet URL: https://www.st.com/content/ccc/resource/technical/document/datasheet/06/1d/48/9c/6c/20/4a/b2/CD00050750.pdf/files/CD00050750.pdf/jcr:content/translations/en.CD00050750.pdf - Manufacturer Name: STMicroelectronics - LCSC Part Number: C7519 - Part Type: Protection - License: https://creativecommons.org/licenses/by/4.0/ - Role: Protection - Symbol Style: parametric-v1 - Role Details: ESD protection for USB 2.0 D+ and D- close to USB-C receptacle. **Pins:** - GND [pin 2] - I/O1 [pin 6] - I/O1 [pin 1] - I/O2 [pin 3] - I/O2 [pin 4] - VBUS [pin 5] ### D2 — [Generic LED SMD](https://www.flux.ai/jharwinbarrozo/generic-led-smd~ku.md) - Package: LED_0603_1608Metric - Part Type: LED - Role Details: Firmware-controlled status LED, low current to preserve power budget. - Role: Human Interface **Pins:** - A [pin 2] - K [pin 1] ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - Manufacturer Name: GCT - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: USB4105-GF-A - Symbol Style: parametric-v1 - Manufacturer Name: GCT - Part Type: USB C - Role: Connector - Role Details: USB-C receptacle; VBUS supports 0.5–3A source plan with CC Rd pulldowns. **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 — [Tactile Switch SPST-NO PTS526 SK15 SMTR2 LFS](https://www.flux.ai/collinsemasi/tactile-switch-spst-no-pts526-sk15-smtr2-lfs~83.md) - Role: Human Interface - Part Type: Switch - Datasheet URL: https://www.ckswitches.com/media/2780/pts526.pdf - Manufacturer Part Number: PTS526 SK15 SMTR2 LFS - Manufacturer Name: C&K - Role Details: Manual reset button from ESP32-C3 EN to ground. **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: Human Interface - Role Details: BOOT button pulls GPIO9 low for ESP32-C3 download mode. - Manufacturer Name: C&K - Datasheet URL: https://www.ckswitches.com/media/2780/pts526.pdf - Manufacturer Part Number: PTS526 SK15 SMTR2 LFS - Part Type: Switch **Pins:** - 2 [pin 2] - 4 [pin 4] - 1 [pin 1] - 3 [pin 3] ### U1 — [ESP32-C3-WROOM-02-N4](https://www.flux.ai/vasy_skral/esp32-c3-wroom-02-n4~tqi.md) - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-c3-wroom-02_datasheet_en.pdf - Role Details: Dual-radio environmental node controller; antenna requires board-edge keepout in layout. - Part Type: Module - Symbol Style: Parametric - Role: MCU / Radio - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Espressif Systems - Manufacturer Part Number: ESP32-C3-WROOM-02-N4 **Pins:** - 3V3 [pin 1] - EN [pin 2] - GND [pin 38] - GND [pin 32] - GND [pin 37] - GND [pin 22] - GND [pin 19] - GND [pin 34] - GND [pin 31] - GND [pin 21] - GND [pin 39] - GND [pin 36] - GND [pin 9] - GND [pin 25] - GND [pin 33] - GND [pin 29] - GND [pin 30] - GND [pin 28] - GND [pin 20] - GND [pin 35] - GND [pin 26] - GND [pin 24] - GND [pin 23] - GND [pin 27] - 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) - Datasheet URL: https://sensirion.com/media/documents/33FD6951/67EB9032/HT_DS_Datasheet_SHT4x_5.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: I2C temperature/humidity sensor at address 0x44 with 100nF local decoupling. - Part Type: Sensors - Manufacturer Part Number: SHT41-AD1B-R2 - Manufacturer Name: Sensirion - Role: Sensing **Pins:** - SCL [pin 2] - SDA [pin 1] - VDD [pin 3] - VSS [pin 4] ### U3 — [TPS25210LRPWR](https://www.flux.ai/adrian95/tps25210lrpwr~9ww.md) - Manufacturer Part Number: TPS25210LRPWR - Role Details: 5V input eFuse; ILIM set to 3.5A by 953Ω RILM per datasheet example. - Part Type: Power Management - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps2521.pdf?ts=1625110620252&ref_url=https%253A%252F%252Fwww.ti.com%252Fstore%252Fti%252Fen%252Fp%252Fproduct%252F%253Fp%253DTPS25210LRPWR - License: https://creativecommons.org/licenses/by/4.0/ - Role: Protection - Manufacturer Name: Texas Instruments - Package or Case Code: TPS25210LRPWR **Pins:** - DVDT_1 [pin 7] - DVDT_2 [pin 14] - EN/UVLO_1 [pin 1] - EN/UVLO_2 [pin 12] - GND [pin 8] - ILM [pin 9] - IN [pin 5] - ITIMER_1 [pin 10] - ITIMER_2 [pin 11] - OUT [pin 6] - OVCSEL [pin 2] - PG [pin 3] - PGTH_1 [pin 4] - PGTH_2 [pin 13] ### U4 — [AP63203WU-7](https://www.flux.ai/adrian95/ap63203wu-7~o8a.md) - Manufacturer Part Number: AP63203WU-7 - Role: Power Conversion - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP63200-AP63201-AP63203-AP63205.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Integrated Circuit - Role Details: Efficient 5V protected input to 3.3V rail for ESP32-C3 and SHT41. - Manufacturer Name: Diodes Incorporated **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/monkeybites/usb-c-wifi-ble-t-rh-sensor-node~bs](https://www.flux.ai/monkeybites/usb-c-wifi-ble-t-rh-sensor-node~bs).* --- *Generated from [https://www.flux.ai/monkeybites/usb-c-wifi-ble-t-rh-sensor-node~bs](https://www.flux.ai/monkeybites/usb-c-wifi-ble-t-rh-sensor-node~bs)*