# WiFi Water Flow Meter epjL ## Description WiFi-enabled ultrasonic water flow meter interface for 3/4 inch PVC pipe with USB-C power, ESP32 WiFi, 12V RS485 sensor supply, and protected sensor interface. ## Project Details - **Owner:** dacre - **Created:** 6/30/2026 - **Last Updated:** 6/30/2026 - **Visibility:** Public - **Domain:** IoT - **Operating Voltage:** 5V - **Power Requirements:** USB-C - **Connectivity:** WiFi ## Key Components ### D1 — [USBLC6-2SC6](https://www.flux.ai/cherepanyadima/usblc6-2sc6~4b.md) - Manufacturer Name: STMicroelectronics - Manufacturer Part Number: USBLC6-2SC6 - Part Type: Diode - Role: USB input ESD clamp - Datasheet URL: https://www.st.com/resource/en/datasheet/cd00050750.pdf **Pins:** - GND [pin 2] - I/O1_IN [pin 1] - I/O1_OUT [pin 6] - I/O2_IN [pin 3] - I/O2_OUT [pin 4] - VBUS [pin 5] ### D2 — [SS34](https://www.flux.ai/lcsc/ss34~6q67.md) - Package or Case Code: SMB_L4.3-W3.6-LS5.4-RD - Forward Voltage: 0.3V to 0.45V - Diode Type: Schottky - Reverse Voltage: 40V - Datasheet URL: https://www.lcsc.com/datasheet/C2758511.pdf - Manufacturer Name: UMW(友台半导体) - JLCPCB Part Class: Extended Part - LCSC Part Number: C2758511 - Part Type: Schottky Barrier Diodes (SBD) - Role: Rectification - Manufacturer Part Number: SS34 **Pins:** - A [pin 2] - K [pin 1] ### D3 — [ESD224DQA](https://www.flux.ai/kicad-part-library/esd224dqa~nw.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/esd224.pdf - Manufacturer Part Number: ESD224DQA - Role: Protection - Manufacturer Name: Texas Instruments Inc. - Package or Case Code: Diodes_UDFN-10_1.0x2.5mm_P0.5mm **Pins:** - ~ [pin 7] - ~ [pin 9] - ~ [pin 4] - ~ [pin 2] - ~ [pin 5] - ~ [pin 6] - ~ [pin 1] - ~ [pin 10] - VSS [pin 8] - VSS [pin 3] ### F1 — [SMD050F-2](https://www.flux.ai/adrian95/smd050f-2.md) - Mount: Surface Mount - Manufacturer Part Number: SMD050F-2 - Role: USB input polyfuse - Manufacturer Name: Littelfuse - Datasheet URL: https://www.littelfuse.com/assetdocs/littelfuse-ptc-smd-datasheet?assetguid=e664881a-0c68-4836-928b-7ed2f0c2a6da - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Circuit Protection Devices **Pins:** - ~ [pin 2] - ~ [pin 1] ### J1 — [Type-C-2.0-6Pin](https://www.flux.ai/lcsc/type-c-2p0-6pin~3phf.md) - Symbol Style: parametric-v1 - Datasheet URL: https://www.snapeda.com/parts/USB4515-GF-A/Global%20Connector%20Technology/datasheet/ - Role: USB-C 5V sink input - LCSC Part Number: C7374563 - Part Type: USB Connectors - Manufacturer Name: Global Connector Technology - Manufacturer Part Number: USB4515-GF-A - JLCPCB Part Class: Extended Part - Package or Case Code: TYPE-C-SMD_TYPE-C-6P-2 **Pins:** - CC1 [pin A5] - CC2 [pin B5] - EH [pin 7] - GND [pin B12] - GND [pin A12] - VBUS [pin A9] - VBUS [pin B9] ### J2 — [284391-4](https://www.flux.ai/adrian95/284391-4.md) - Manufacturer Name: TE Connectivity - Part Type: Connector - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1-1773458-1_EURO_STYLE_QRG&DocType=Data%20Sheet&DocLang=English&PartCntxt=284391-4&DocFormat=pdf - Connector Positions: 4 - Manufacturer Part Number: 284391-4 - Role: External ultrasonic flow sensor connector - Compliance: Green - Mount: Base **Pins:** - 1 [pin 1] - 2 [pin 2] - 3 [pin 3] - 4 [pin 4] ### J3 — [Pin Header 01x06 2.54mm PROGRAMMING CONNECTOR](https://www.flux.ai/zalak201285/pin-header-01x06-2p54mm-programming-connector~ji.md) - Connector Positions: 6 - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role: Programming Interface **Pins:** - JTCK [pin 2] - JTDI [pin 1] - JTDO [pin 3] - JTMS [pin 4] - NJTRST [pin 5] - RESET [pin 6] ### LED1 — [LED 0603 (1608 Metric)](https://www.flux.ai/natarius/led-0603-1608-metric~q1.md) - Package: 0603 - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED2 — [LED 0603 (1608 Metric)](https://www.flux.ai/natarius/led-0603-1608-metric~q1.md) - Package: 0603 - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### LED3 — [LED 0603 (1608 Metric)](https://www.flux.ai/natarius/led-0603-1608-metric~q1.md) - Part Type: LED - Package: 0603 **Pins:** - A [pin 2] - K [pin 1] ### SW1 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - LCSC Part Number: C720477 - Part Type: Tactile Switches - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - 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 - JLCPCB Part Class: Extended Part - Role: Switching - Manufacturer Part Number: TS-1088-AR02016 - Manufacturer Name: XUNPU(讯普) **Pins:** - 1 [pin 1] - 2 [pin 2] ### SW2 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - LCSC Part Number: C720477 - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - Role: Switching - Part Type: Tactile Switches - Manufacturer Name: XUNPU(讯普) - Manufacturer Part Number: TS-1088-AR02016 - 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 **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [AP2112K-3.3TRG1](https://www.flux.ai/adrian95/ap2112k-33trg1~zlq.md) - Symbol Style: parametric-v1 - Manufacturer Part Number: AP2112K-3.3TRG1 - Role: 3.3V logic regulator - Datasheet URL: https://www.diodes.com/assets/Datasheets/AP2112.pdf - Manufacturer Name: Diodes Incorporated - Part Type: Integrated Circuit - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - EN [pin 3] - GND [pin 2] - NC [pin 4] - VIN [pin 1] - VOUT [pin 5] ### U2 — [BD8314NUV](https://www.flux.ai/kicad-part-library/bd8314nuv~2m4.md) - Role: 12V sensor boost regulator - Manufacturer Part Number: BD8314NUV - Datasheet URL: http://rohmfs.rohm.com/en/products/databook/datasheet/ic/power/switching_regulator/bd8314nuv-e.pdf - Package or Case Code: VSON-10-1EP_3x3mm_P0.5mm_EP1.2x2mm **Pins:** - GND [pin 1] - INV [pin 9] - LX [pin 4] - LX [pin 5] - PGND [pin 6] - PGND [pin 11] - PGND [pin 7] - STB [pin 8] - SWOUT [pin 10] - VCC [pin 2] - VREG [pin 3] ### U3 — [ESP32-WROOM-32U](https://www.flux.ai/vasy_skral/esp32-wroom-32u~ix.md) - Manufacturer Part Number: ESP32-WROOM-32U - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32d_esp32-wroom-32u_datasheet_en.pdf - Manufacturer Name: Espressif Systems - Role: WiFi MCU module - Part Type: Module - Connectivity: WiFi - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - 3V3 [pin 2] - EN [pin 3] - GND [pin 39_16] - GND [pin 39_14] - GND [pin 1] - GND [pin 39_17] - GND [pin 15] - GND [pin 39_12] - GND [pin 39_11] - GND [pin 39_5] - GND [pin 39_3] - GND [pin 39_13] - GND [pin 39_21] - GND [pin 38] - GND [pin 39_10] - GND [pin 39_19] - GND [pin 39_1] - GND [pin 39_6] - GND [pin 39_9] - GND [pin 39_18] - GND [pin 39_20] - GND [pin 39_7] - GND [pin 39_8] - GND [pin 39_4] - GND [pin 39_15] - GND [pin 39_2] - IO0 [pin 25] - IO12 [pin 14] - IO13 [pin 16] - IO14 [pin 13] - IO15 [pin 23] - IO16 [pin 27] - IO17 [pin 28] - IO18 [pin 30] - IO19 [pin 31] - IO2 [pin 24] - IO21 [pin 33] - IO22 [pin 36] - IO23 [pin 37] - IO25 [pin 10] - IO26 [pin 11] - IO27 [pin 12] - IO32 [pin 8] - IO33 [pin 9] - IO34 [pin 6] - IO35 [pin 7] - IO4 [pin 26] - IO5 [pin 29] - RXD0 [pin 34] - SCK/CLK [pin 20] - SCS/CMD [pin 19] - SDI/SD1 [pin 22] - SDO/SD0 [pin 21] - SENSOR_VN [pin 5] - SENSOR_VP [pin 4] - SHD/SD2 [pin 17] - SWP/SD3 [pin 18] - TXD0 [pin 35] ### U4 — [MAX14783ExS](https://www.flux.ai/kicad-part-library/max14783exs~cof.md) - Package or Case Code: SOIC-8_3.9x4.9mm_P1.27mm - Manufacturer Name: Maxim Integrated Products, Inc. - Role: RS485 transceiver - Manufacturer Part Number: MAX14783ExS - Datasheet URL: https://datasheets.maximintegrated.com/en/ds/MAX14783E.pdf **Pins:** - ~{RE} [pin 2] - A [pin 6] - B [pin 7] - DE [pin 3] - DI [pin 4] - GND [pin 5] - RO [pin 1] - VCC [pin 8] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/dacre/wifi-water-flow-meter-epjl~mvq](https://www.flux.ai/dacre/wifi-water-flow-meter-epjl~mvq).* --- *Generated from [https://www.flux.ai/dacre/wifi-water-flow-meter-epjl~mvq](https://www.flux.ai/dacre/wifi-water-flow-meter-epjl~mvq)*