# WiFi Water Flow Meter ## Description USB-C powered ESP32 WiFi water-flow-meter controller for an external 12V RS485 ultrasonic sensor on 3/4 inch PVC pipe, with protected power input, 3.3V logic rail, 12V boost rail, programming header, reset/boot controls, and status LEDs. ## Project Details - **Owner:** ryanf - **Created:** 7/17/2026 - **Last Updated:** 7/19/2026 - **Visibility:** Public ## Key Components ### D1 — [ESD5V0D7-TP](https://www.flux.ai/lcsc/esd5v0d7-tp~9lyu.md) - JLCPCB Part Class: Extended Part - Role Details: 5V VBUS TVS/ESD protection near USB-C connector - LCSC Part Number: C1974840 - Package or Case Code: SOD-723_L1.0-W0.6-LS1.4-RD - Part Type: TVS - Manufacturer Part Number: ESD5V0D7-TP - Manufacturer Name: MCC(美微科) - Role: ESD Protection **Pins:** - A [pin 2] - C [pin 1] ### D2 — [B5819W](https://www.flux.ai/openpartlist/b5819w~cl.md) - Part Type: Diode - Manufacturer Name: Good-Ark Semiconductor - Manufacturer Part Number: B5819W - Datasheet URL: https://www.mccsemi.com/pdf/Products/B5817W-B5819W(SOD-123).pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role: Boost Rectifier - Role Details: LM27313 catch/rectifier diode, 40V 1A Schottky **Pins:** - A [pin 2] - K [pin 1] ### D3 — [ESD5V0D7-TP](https://www.flux.ai/lcsc/esd5v0d7-tp~9lyu.md) - JLCPCB Part Class: Extended Part - LCSC Part Number: C1974840 - Role Details: Cable-side ESD clamp on RS485_A; replace with dedicated RS485 TVS array for long/industrial cables if needed - Package or Case Code: SOD-723_L1.0-W0.6-LS1.4-RD - Part Type: TVS - Manufacturer Part Number: ESD5V0D7-TP - Manufacturer Name: MCC(美微科) - Role: ESD Protection **Pins:** - A [pin 2] - C [pin 1] ### D4 — [ESD5V0D7-TP](https://www.flux.ai/lcsc/esd5v0d7-tp~9lyu.md) - Role: ESD Protection - JLCPCB Part Class: Extended Part - Package or Case Code: SOD-723_L1.0-W0.6-LS1.4-RD - LCSC Part Number: C1974840 - Manufacturer Name: MCC(美微科) - Role Details: Cable-side ESD clamp on RS485_B; replace with dedicated RS485 TVS array for long/industrial cables if needed - Manufacturer Part Number: ESD5V0D7-TP - Part Type: TVS **Pins:** - A [pin 2] - C [pin 1] ### D5 — [0603GBD0790S01](https://www.flux.ai/adrian95/0603gbd0790s01~iak.md) - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4336/0603GBD0790S01.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: 0603GBD0790S01 - Part Type: LED - Role: Status LED - Manufacturer Name: ORIENTAL TECHNOLOGY - Role Details: 3.3V power-present indicator **Pins:** - A [pin 2] - K [pin 1] ### D6 — [0603GBD0790S01](https://www.flux.ai/adrian95/0603gbd0790s01~iak.md) - Role: Status LED - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4336/0603GBD0790S01.pdf - License: https://creativecommons.org/licenses/by/4.0/ - Role Details: ESP32 GPIO-controlled WiFi status indicator - Manufacturer Name: ORIENTAL TECHNOLOGY - Manufacturer Part Number: 0603GBD0790S01 - Part Type: LED **Pins:** - A [pin 2] - K [pin 1] ### D7 — [0603GBD0790S01](https://www.flux.ai/adrian95/0603gbd0790s01~iak.md) - Manufacturer Name: ORIENTAL TECHNOLOGY - Role: Status LED - Part Type: LED - Manufacturer Part Number: 0603GBD0790S01 - Role Details: ESP32 GPIO-controlled flow activity indicator - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://mm.digikey.com/Volume0/opasdata/d220001/medias/docus/4336/0603GBD0790S01.pdf **Pins:** - A [pin 2] - K [pin 1] ### J1 — [USB4105-GF-A](https://www.flux.ai/adrian95/usb4105-gf-a~im9.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: USB C - Manufacturer Name: GCT - Symbol Style: parametric-v1 - Role Details: USB-C receptacle for 5V input; CC handled by TUSB320 current detector - Manufacturer Part Number: USB4105-GF-A - Manufacturer Name: GCT - Datasheet URL: https://gct.co/files/specs/usb4105-spec.pdf - Role: Power Input Connector **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] ### J2 — [284391-4](https://www.flux.ai/adrian95/284391-4.md) - Compliance: Green - Role Details: 3.5mm pitch field terminal block for external 12V RS485 ultrasonic flow sensor cable - Manufacturer Name: TE Connectivity - Manufacturer Part Number: 284391-4 - Mount: Base - Role: Sensor 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 - Part Type: Connector **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) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Role Details: 3.3V UART0 programming header: 3V3, GND, TXD0, RXD0, EN, GPIO0 - Role: Programming Header **Pins:** - JTCK [pin 2] - JTDI [pin 1] - JTDO [pin 3] - JTMS [pin 4] - NJTRST [pin 5] - RESET [pin 6] ### SW1 — [1571563-8](https://www.flux.ai/vasy_skral/1571563-8~oj.md) - Role Details: Manual reset button from EN to GND - Manufacturer Part Number: 1571563-8 - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1308111-1_SWITCHES_CORE_PROGRAM_CATALOG&DocType=CS&DocLang=English - Manufacturer Name: TE Connectivity ALCOSWITCH Switches - Role: Reset Button - Part Type: Switch **Pins:** - ~ [pin 3] - ~ [pin 2] - ~ [pin 1] - ~ [pin 4] ### SW2 — [1571563-8](https://www.flux.ai/vasy_skral/1571563-8~oj.md) - Part Type: Switch - Manufacturer Name: TE Connectivity ALCOSWITCH Switches - Datasheet URL: https://www.te.com/commerce/DocumentDelivery/DDEController?Action=srchrtrv&DocNm=1308111-1_SWITCHES_CORE_PROGRAM_CATALOG&DocType=CS&DocLang=English - Role: Boot Button - Role Details: Manual BOOT button from GPIO0 to GND - Manufacturer Part Number: 1571563-8 **Pins:** - ~ [pin 3] - ~ [pin 2] - ~ [pin 1] - ~ [pin 4] ### U1 — [MP5016GQH-Z](https://www.flux.ai/monolithicpower/mp5016gqh-z~mgj.md) - Product Info Url: https://www.monolithicpower.com/en/catalog/product/view/id/428?utm_source=ultralibrarian&utm_medium=component_search&utm_campaign=listing - Manufacturer Name: Monolithic Power Systems - Role Details: USB-C VBUS eFuse; current limit set near 3A for 5V/3A Type-C source operation - Product Image Url: https://www.monolithicpower.com/pub/media/catalog/product/M/P/MP5016_428_1.jpg - Datasheet URL: https://www.monolithicpower.com/en/documentview/productdocument/index/version/2/document_type/Datasheet/lang/en/sku/MP5016GQH-Z - Role: Protection - Package or Case Code: QFN10-1p5X2_MNP - Manufacturer Part Number: MP5016GQH-Z **Pins:** - DV/DT [pin 10] - EN [pin 9] - GATE [pin 8] - GND [pin 3] - ILIMIT [pin 4] - MODE [pin 5] - SOURCE [pin 7] - SOURCE [pin 6] - VCC [pin 1] - VCC [pin 2] ### U2 — [TPS62162DSGT](https://www.flux.ai/vasyl/tps62162dsgt~hjm.md) - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=http%253A%252F%252Fwww.ti.com%252Flit%252Fgpn%252Ftps62161 - Role: Voltage Regulator - Part Type: Integrated Circuit - Manufacturer Part Number: TPS62162DSGT - Role Details: Fixed 3.3V/1A buck regulator for ESP32 WiFi rail; sized for ESP32 500mA peak plus logic loads **Pins:** - AGND [pin 4] - EN [pin 3] - FB [pin 5] - PAD [pin 9] - PG [pin 8] - PGND [pin 1] - SW [pin 7] - VIN [pin 2] - VOS [pin 6] ### U3 — [LM27313XMF/NOPB](https://www.flux.ai/vasyl/lm27313xmfnopb~bq1.md) - Role Details: 12V boost converter for external RS485 ultrasonic sensor; SHDN controlled by ESP32 for power limiting - Role: Voltage Regulator - Manufacturer Name: Texas Instruments - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Flm27313 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: LM27313XMF/NOPB - Part Type: DC DC Switching Regulators **Pins:** - ~SHDN [pin 4] - FB [pin 3] - GND [pin 2] - SW [pin 1] - VIN [pin 5] ### U4 — [ESP32-WROOM-32 - 5482847](https://www.flux.ai/kicad-part-library/esp32-wroom-32-5482847~9u.md) - Role Details: ESP32 WiFi module; UART2 to RS485, UART0 programming header, GPIO LEDs and 12V boost enable - Datasheet URL: https://www.espressif.com/sites/default/files/documentation/esp32-wroom-32_datasheet_en.pdf - Role: Microcontroller - Manufacturer Name: Texas Instruments Inc. - Manufacturer Part Number: ESP32-WROOM-32 - Package or Case Code: ESP32-WROOM-32 - Part Type: RF Module **Pins:** - EN [pin 3] - GND [pin 39] - GND [pin 15] - GND [pin 1] - GND [pin 38] - 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] - NC [pin 32] - RXD0/IO3 [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/IO1 [pin 35] - VDD [pin 2] ### U5 — [SP3485EP](https://www.flux.ai/vasyl/sp3485ep~dnq.md) - Manufacturer Name: Sipex Corporation - Part Type: Integrated Circuit - Manufacturer Part Number: SP3485EP - Role: Interface Transceiver - Role Details: 3.3V half-duplex RS485 transceiver; DE and /RE tied for direction control - Datasheet URL: http://www.icbase.com/pdf/SPX/SPX00480106.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] ### U6 — [TUSB320](https://www.flux.ai/vasyl/tusb320~f5.md) - Manufacturer Name: Texas Instruments - Role Details: Configured as UFP sink; CC current advertisement readable over I2C by ESP32 - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Ftusb320 - Role: USB-C Controller - Manufacturer Part Number: TUSB320 - Part Type: Integrated Circuit **Pins:** - ~EN [pin 11] - ~INT~/OUT3 [pin 6] - ADDR [pin 5] - CC1 [pin 1] - CC2 [pin 2] - GND [pin 10] - ID [pin 9] - PORT [pin 3] - SCL/OUT2 [pin 8] - SDA/OUT1 [pin 7] - VBUS_DET [pin 4] - VDD [pin 12] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/ryanf/wifi-water-flow-meter-kjubf~z2q](https://www.flux.ai/ryanf/wifi-water-flow-meter-kjubf~z2q).* --- *Generated from [https://www.flux.ai/ryanf/wifi-water-flow-meter-kjubf~z2q](https://www.flux.ai/ryanf/wifi-water-flow-meter-kjubf~z2q)*