WiFi Water Flow Meter Design

flux

0:03

Work done
  • Set the layout to 80 mm x 60 mm with a Standard 4 Layer stackup and compacted the board from the previously oversized outline. This matches the stage-2 and layout guidance to explicitly set board size and stackup before placement, and to use a 4-layer board for an ESP32 design with USB and multiple rails
  • Grouped the placement by functional block:
    • Power on the left around J1, U2, and U3
    • MCU / communication on the upper-right around U1 with J2 inset in the lower-right programming area
    • RS485 centered between the MCU and sensor interface with U4
    • Sensor / user I O on the right edge with J3, S1, S2, D3, D4, and D5
  • Placed U1 at the top-right board edge with the antenna side facing outward and using an antenna overhang rule consistent with the ESP32 placement guidance for PCB antennas at the board edge
  • Verified the placement pass completed cleanly with no overlap or out-of-bounds placement problems. The only remaining review items are unrouted electrical connections, which are expected because trace routing has not been done yet.
Success criteria review
  • ✅ The board size is set to 80 mm x 60 mm and the layout still has comfortable routing space
  • ✅ Components are grouped into clear power, MCU/communication, RS485, and sensor/interface regions
  • ✅ The ESP32 antenna on U1 is positioned at the board edge for RF-friendly placement
Next steps I can continue with PCB finishing work next: route the critical nets, set any additional trace-width or keepout rules, and do a final RF / connector clearance review around U1, J1, and J3.
Review RF clearances
Set routing rules
Optimize critical placement
12 days
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ESP32 RS485 Water Flow Meter

ESP32 RS485 Water Flow Meter thumbnail
USB-C powered ESP32 WiFi water flow meter schematic with protected 5V input, 3.3V LDO, 12V boost supply for an external RS485 ultrasonic sensor, UART programming header, boot/reset network, and three status LEDs for power, WiFi, and flow activity.

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