# WiFi Water Flow Meter ## Description USB-C powered ESP32 WiFi water flow meter with 12V RS485 ultrasonic sensor interface for 3/4 inch PVC pipe Vibe-hardwared ## Project Details - **Owner:** adriangispert - **Created:** 5/15/2026 - **Last Updated:** 5/15/2026 - **Visibility:** Public ## Key Components ### D1 — [TPD1E05U06DPYR](https://www.flux.ai/lcsc/tpd1e05u06dpyr~sh59.md) - Datasheet URL: https://www.ti.com/lit/ds/symlink/tpd1e05u06.pdf - Part Type: ESD and Surge Protection (TVS/ESD) - JLCPCB Part Class: Extended Part - LCSC Part Number: C2937017 - Package or Case Code: DFN1006-2L-RD - Manufacturer Name: TPD1E05U06DPYR - Role: ESD Protection - Manufacturer Part Number: TPD1E05U06DPYR - Role Details: 5V USB VBUS transient protection to GND - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - C [pin 1] ### D2 — [WE-TVS-82400102](https://www.flux.ai/kicad-part-library/we-tvs-82400102~vb9.md) - Manufacturer Name: Texas Instruments Inc. - Role: ESD Protection - Manufacturer Part Number: WE-TVS-82400102 - Datasheet URL: https://www.we-online.com/components/products/datasheet/82400102.pdf - Role Details: TVS protection for external RS485 A/B lines - Package or Case Code: SOT-23-6 **Pins:** - ~ [pin 5] - ~ [pin 1] - ~ [pin 4] - ~ [pin 2] - ~ [pin 3] - ~ [pin 6] ### D3 — [MBRA130LT3](https://www.flux.ai/adrian95/mbra130lt3~cp.md) - Manufacturer Part Number: MBRA130LT3 - Manufacturer Name: onsemi - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Diode - Role: Boost Rectifier - Role Details: 30V 1A Schottky diode for 12V boost converter - Datasheet URL: https://media.digikey.com/pdf/Data%20Sheets/ON%20Semiconductor%20PDFs/MBRA130LT3-Rev7.pdf **Pins:** - ANODE [pin 1] - CATHODE [pin 2] ### D4 — [Low Power Green LED](https://www.flux.ai/corynrobinson/low-power-green-led~0r.md) - Manufacturer Name: Dialight - Manufacturer Part Number: 598-8070-107F - Purchase Url: https://octopart.com/598-8070-107f-dialight-872854?r=sp - Role Details: 3.3V power indicator LED - Role: Status Indicator - Package or Case Code: D_0603_1608Metric - Part Type: LED - Datasheet URL: https://octopart.com/datasheet/598-8070-107f-dialight-872854 - Current: 20mA - Forward Voltage: 2V **Pins:** - A - K ### D5 — [LTST-C190TBKT](https://www.flux.ai/adrian95/ltst-c190tbkt~9us.md) - Role: Status Indicator - License: https://creativecommons.org/licenses/by/4.0/ - Datasheet URL: https://optoelectronics.liteon.com/upload/download/DS-22-99-0224/LTST-C190TBKT.PDF - Manufacturer Part Number: LTST-C190TBKT - Role Details: ESP32 GPIO-driven WiFi status LED - Part Type: LED - Manufacturer Name: Lite-On Inc. **Pins:** - A [pin 2] - K [pin 1] ### D6 — [LTST-C190KRKT](https://www.flux.ai/adrian95/ltst-c190krkt~3pw.md) - Manufacturer Part Number: LTST-C190KRKT - Role Details: ESP32 GPIO-driven flow activity LED - Part Type: LED - Manufacturer Name: Lite-On Inc. - Role: Status Indicator - Datasheet URL: https://optoelectronics.liteon.com/upload/download/DS-22-99-0151/LTST-C190KRKT.pdf - License: https://creativecommons.org/licenses/by/4.0/ **Pins:** - A [pin 2] - K [pin 1] ### F1 — [0805L110WR](https://www.flux.ai/adrian95/0805l110wr~h3i.md) - Role Details: 1.1A hold PPTC protecting USB 5V input; sized for estimated ~0.9A peak load - Manufacturer Part Number: 0805L110WR - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: Littelfuse Inc. - Part Type: Fuse - Role: Input Protection - Datasheet URL: https://www.littelfuse.com/media?resourcetype=datasheets&itemid=3b1fa5dc-24aa-4363-b543-edb057c2fffa&filename=littelfuse_ptc_0805l_datasheet.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] ### J1 — [USB4215-03-A](https://www.flux.ai/adrian95/usb4215-03-a~kg3.md) - Package or Case Code: GCT_USB4215-03-A_REVA - License: https://creativecommons.org/licenses/by/4.0/ - Role: Power Input Connector - Symbol Style: parametric-v1 - Datasheet URL: https://gct.co/files/specs/usb4215-spec.pdf - Role Details: USB-C 5V sink input with CC pull-downs and VBUS protection - Manufacturer Name: GCT - Manufacturer Part Number: USB4215-03-A - Part Type: USB C **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 — [DB125-3.81-4P-GN-S](https://www.flux.ai/jharwinbarrozo/db125-3p81-4p-gn-s~l9d.md) - Role: Sensor Connector - Manufacturer Part Number: DB125-3.81-4P-GN-S - Manufacturer Name: DIBO - Role Details: 4-position terminal for 12V/GND/RS485_A/RS485_B to external ultrasonic flow sensor - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Connector - Datasheet URL: https://www.lcsc.com/datasheet/lcsc_datasheet_2304061030_DORABO-DB125-3-81-4P-GN-S_C395880.pdf **Pins:** - P1 [pin 1] - P2 [pin 2] - P3 [pin 3] - P4 [pin 4] ### J3 — [Pin Header 01x06 2.54mm PROGRAMMING CONNECTOR](https://www.flux.ai/zalak201285/pin-header-01x06-2p54mm-programming-connector~ji.md) - Role Details: UART0 TX/RX, 3V3, GND, EN, BOOT access for firmware updates - Part Type: Connector - License: https://creativecommons.org/licenses/by/4.0/ - Role: Programming Header **Pins:** - JTCK [pin 2] - JTDI [pin 1] - JTDO [pin 3] - JTMS [pin 4] - NJTRST [pin 5] - RESET [pin 6] ### J4 — [B2B-PH-K-S](https://www.flux.ai/adrian95/b2b-ph-k-s~fx.md) - Role: Power Conversion - Role Details: 1S LiPo battery connector, pin 1 battery positive, pin 2 ground - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Name: JST - Package or Case Code: JST_B2B-PH-K-S - Manufacturer Part Number: B2B-PH-K-S - Part Type: Connector - Datasheet URL: https://www.jst-mfg.com/product/pdf/eng/ePH.pdf **Pins:** - 1 [pin 1] - 2 [pin 2] ### SW1 — [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 - 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 - Manufacturer Part Number: TS-1088-AR02016 - Role: Reset Button - Manufacturer Name: XUNPU(讯普) - Part Type: Tactile Switches - Role Details: Momentary reset switch from EN to GND - JLCPCB Part Class: Extended Part **Pins:** - 1 [pin 1] - 2 [pin 2] ### SW2 — [TS-1088-AR02016](https://www.flux.ai/lcsc/ts-1088-ar02016~e3n1.md) - Manufacturer Part Number: TS-1088-AR02016 - Role Details: Momentary boot switch from GPIO0 to GND for UART download mode - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2409302330_XUNPU-TS-1088-AR02016_C720477.pdf - LCSC Part Number: C720477 - 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 - Role: Boot Button - Manufacturer Name: XUNPU(讯普) - JLCPCB Part Class: Extended Part - Part Type: Tactile Switches **Pins:** - 1 [pin 1] - 2 [pin 2] ### U1 — [ESP32-S3-WROOM-1-N16R8](https://www.flux.ai/adrian95/esp32-s3-wroom-1-n16r8~fs1.md) - Role: WiFi MCU - Manufacturer Name: Espressif Systems - Datasheet URL: https://www.mouser.com/datasheet/2/891/esp32_s3_wroom_1_wroom_1u_datasheet_en-2930317.pdf - Part Type: Module - Symbol Style: parametric-v1 - License: https://creativecommons.org/licenses/by/4.0/ - Manufacturer Part Number: ESP32-S3-WROOM-1-N16R8 - Role Details: ESP32-S3 controller with integrated PCB antenna; 3.3V supply, UART programming, RS485 control **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 — [MAX3485AEASA+](https://www.flux.ai/lcsc/max3485aeasaplus~8qpq.md) - Role: RS485 Transceiver - Datasheet URL: https://storage.googleapis.com/graviton-electric-symbols/document_assets/lcsc/2304140030_Analog-Devices-Inc--Maxim-Integrated-MAX3485AEASA-_C143446.pdf - Product Info Url: https://lcsc.com/product-detail/RS-485-RS-422_MAXIM_MAX3485AEASA_MAX3485AEASA_C143446.html - Role Details: 3.3V half-duplex UART-to-RS485 interface for external ultrasonic flow sensor - JLCPCB Part Class: Extended Part - Package or Case Code: SOIC-8_L4.9-W3.9-P1.27-LS6.0-BL-2 - Manufacturer Name: ADI(亚德诺)/MAXIM(美信) - Manufacturer Part Number: MAX3485AEASA+ - Part Type: RS-485/RS-422 ICs - LCSC Part Number: C143446 **Pins:** - A [pin 6] - B [pin 7] - DE [pin 3] - DI [pin 4] - GND [pin 5] - nRE [pin 2] - RO [pin 1] - VCC [pin 8] ### U3 — [LM27313XMF/NOPB](https://www.flux.ai/vasyl/lm27313xmfnopb~bq1.md) - Role Details: 5V to 12V boost converter for ultrasonic sensor power - Manufacturer Name: Texas Instruments - License: https://creativecommons.org/licenses/by/4.0/ - Role: Boost Regulator - Manufacturer Part Number: LM27313XMF/NOPB - Part Type: DC DC Switching Regulators - Datasheet URL: https://www.ti.com/general/docs/suppproductinfo.tsp?distId=10&gotoUrl=https%3A%2F%2Fwww.ti.com%2Flit%2Fgpn%2Flm27313 **Pins:** - ~SHDN [pin 4] - FB [pin 3] - GND [pin 2] - SW [pin 1] - VIN [pin 5] ### U4 — [PAM2305AAB330](https://www.flux.ai/vasyl/pam2305aab330~nfe.md) - Role Details: PAM2305AAB330 fixed 3.3V 1A buck regulator, SYS_PWR to 3V3 - Manufacturer Name: Diodes Incorporated - Part Type: Integrated Circuit - Datasheet URL: https://cdn.sparkfun.com/assets/d/8/3/2/4/PAM2305AAB330_Datasheet.pdf - Role: Power Conversion - Manufacturer Part Number: PAM2305AAB330 **Pins:** - EN [pin 3] - FB [pin 4] - GND [pin 2] - SW [pin 5] - Vin [pin 1] ### U5 — [BQ24074RGTT](https://www.flux.ai/lcsc/bq24074rgtt~fpyl.md) - LCSC Part Number: C2861252 - Role Details: BQ24074 single-cell LiPo charger and power-path manager; alternate footprint selected to resolve placement review issue - Part Type: Battery Management ICs - Package or Case Code: VQFN-16_L3.0-W3.0-P0.50-TL-EP1.7 - Manufacturer Part Number: BQ24074RGTT - Role: Power Conversion - Manufacturer Name: TI(德州仪器) - JLCPCB Part Class: Extended Part **Pins:** - ~{CE} [pin 4] - ~{CHG} [pin 9] - ~{PGOOD} [pin 7] - BAT [pin 2] - BAT [pin 3] - EN1 [pin 6] - EN2 [pin 5] - EP [pin 17] - ILIM [pin 12] - IN [pin 13] - ISET [pin 16] - ITERM [pin 15] - OUT [pin 11] - OUT [pin 10] - TMR [pin 14] - TS [pin 1] - VSS [pin 8] ### U6 — [SHT31-DIS-B2.5KS](https://www.flux.ai/adrian95/sht31-dis-b2p5ks~6uh.md) - License: https://creativecommons.org/licenses/by/4.0/ - Part Type: Sensor - Role Details: SHT31 I2C relative humidity and temperature sensor, default I2C address 0x44 - Datasheet URL: https://sensirion.com/media/documents/213E6A3B/63A5A569/Datasheet_SHT3x_DIS.pdf - Role: Sensing (Shunt) - Manufacturer Name: Sensirion - 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] *The full schematic, PCB layout, bill of materials, and interactive design are available at [https://www.flux.ai/adriangispert/wifi-water-flow-meter~wz](https://www.flux.ai/adriangispert/wifi-water-flow-meter~wz).* --- *Generated from [https://www.flux.ai/adriangispert/wifi-water-flow-meter~wz](https://www.flux.ai/adriangispert/wifi-water-flow-meter~wz)*