# USB-C WiFi BLE Environmental Sensor ## Description Consumer USB-C powered low-power temperature/humidity sensor node with ESP32-S3 Wi-Fi/BLE, SHT31 I2C sensor, protected 5V input, 3.3V regulation, debug access, and RF-aware PCB layout. ## Project Details - **Owner:** ale98719 - **Created:** 5/3/2026 - **Last Updated:** 5/3/2026 - **Visibility:** Public ## Key Components ### J1 — [USB4215-03-A](https://www.flux.ai/adrian95/usb4215-03-a~kg3.md) - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ - Role: USB-C Power Input - Part Type: USB C - Manufacturer Part Number: USB4215-03-A - Datasheet URL: https://gct.co/files/specs/usb4215-spec.pdf - Package or Case Code: GCT_USB4215-03-A_REVA - Manufacturer Name: GCT - Role Details: USB-C receptacle configured as 5V default sink with CC pull-downs **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] ### J2 — [TSW-106-06-T-S](https://www.flux.ai/adrian95/tsw-106-06-t-s.md) - Manufacturer Part Number: TSW-106-06-T-S - Datasheet URL: http://suddendocs.samtec.com/prints/tsw-xxx-xx-xxx-x-xx-xxx-mkt.pdf - Part Type: Connectors - Role Details: 6-pin UART/reset/boot/debug header for firmware bring-up - License: https://creativecommons.org/licenses/by/4.0/ - Role: Debug Header - Mount: PCB - Manufacturer Name: Samtec **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] - 5 [pin 5] - 6 [pin 6] ### U1 — [ESP32-S3-WROOM-1-N16R8](https://www.flux.ai/adrian95/esp32-s3-wroom-1-n16r8~fs1.md) - Role Details: ESP32-S3 Wi-Fi 2.4GHz 802.11 b/g/n plus BLE 5.x environmental node controller - Manufacturer Name: Espressif Systems - Manufacturer Part Number: ESP32-S3-WROOM-1-N16R8 - Datasheet URL: https://www.mouser.com/datasheet/2/891/esp32_s3_wroom_1_wroom_1u_datasheet_en-2930317.pdf - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Module - Role: MCU / Radio **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND_1 [pin 1] - GND_10 [pin 48] - GND_11 [pin 49] - GND_2 [pin 40] - GND_3 [pin 41] - GND_4 [pin 42] - GND_5 [pin 43] - GND_6 [pin 44] - GND_7 [pin 45] - GND_8 [pin 46] - GND_9 [pin 47] - 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 — [SHT31-DIS-B2.5KS](https://www.flux.ai/adrian95/sht31-dis-b2p5ks~6uh.md) - Role Details: SHT31-DIS I2C digital T/RH sensor on 3.3V rail - Datasheet URL: https://sensirion.com/media/documents/213E6A3B/63A5A569/Datasheet_SHT3x_DIS.pdf - Role: Temperature/Humidity Sensor - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Sensirion - Part Type: Sensor - Manufacturer Part Number: SHT31-DIS-B2.5KS **Pins:** - ADDR [pin 2] - ALERT [pin 3] - EP [pin 9] - NRESET [pin 6] - R [pin 7] - SCL [pin 4] - SDA [pin 1] - VDD [pin 5] - VSS [pin 8] ### U3 — [5V eFuse](https://www.flux.ai/corynrobinson/5v-efuse~ci.md) - Product Info Url: https://www.ti.com/product/TPS25200 - Manufacturer Name: Texas Instruments - Role: USB Power Protection - Datasheet URL: https://www.ti.com/lit/ds/symlink/tps25200.pdf?ts=1643733993618&ref_url=https%253A%252F%252Fwww.ti.com%252Fpower-management%252Fpower-switches%252Fefuse-hotswap-controllers%252Fproducts.html - Role Details: TPS25200 5V eFuse provides OCP, OVP/OVLO, UVLO, soft start and reverse blocking while disabled - Purchase Url: https://octopart.com/tps25200drvt-texas+instruments-38819194?r=sp - Manufacturer Part Number: TPS25200DRVR - Voltage: 5V - Package or Case Code: 6-WSON **Pins:** - *FAULT - EN - EPAD - GND - ILIM - IN - OUT ### U4 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1~zlq.md) - Manufacturer Name: Diodes Incorporated - Role: 3.3V Regulator - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Manufacturer Part Number: AP2112K-3.3TRG1 - Symbol Style: parametric-v1 - Part Type: Integrated Circuit - Role Details: AP2112K-3.3 LDO generating 3.3V rail from protected 5V - License: https://creativecommons.org/licenses/by/4.0/ **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/ale98719/usb-c-wifi-ble-environmental-sensor~vs](https://www.flux.ai/ale98719/usb-c-wifi-ble-environmental-sensor~vs).* --- *Generated from [https://www.flux.ai/ale98719/usb-c-wifi-ble-environmental-sensor~vs](https://www.flux.ai/ale98719/usb-c-wifi-ble-environmental-sensor~vs)*