LED Blinking Circuit Design


  • Set Layout's sizeX to "100mm"
  • Set Layout's sizeY to "130mm"
  • Set Layout's boardShape to "rectangle"
  • Set Layout's cornerRadius to "2mm"
  • Set Layout's stackup to "Standard 4 Layer (Custom)"
  • Set Layout's boardInsetMargin to "0.2mm"
  • Set Layout's keepOut to "0.2mm"
Placed 43 component(s): R14, C5, J17, R3, R10, J9, R6, J6, J1, R9, H3, J3, R1, J4, C2, J7, R7, J14, J2, C6, R4, R11, R12, R13, J8, R8, J19, J12, J18, R5, R2, J10, J13, J5, J11, J15, H2, C1, H1, R15, J16, H4, R16
Work done
  • Built the schematic for the dual-PCA9685 servo controller: two PCA9685 drivers, PCA9306 I2C level shifter, Raspberry Pi/STM32 connectors, 16 servo outputs with 220Ω series resistors, I2C pull-ups, OE pull-up, decoupling, bulk caps, 6V/5.1V rails, common ground, and mounting holes.
  • Configured a 4-layer PCB stackup with GND and power-plane intent, set a compact 100 × 130 mm board, and placed components with host connectors on the left, level shifter near center, PCA9685s and servo outputs on the right, and power input at the top/right.
  • ERC is clean for floating pins, missing power, and single-pin nets; footprints and layer assignments are present.
Success criteria review
  • ✅ Schematic connectivity and key parts implemented.
  • ✅ 4-layer board configured and components placed in the requested left-to-right flow.
  • ❌ Not ready for Gerber export: physical routing/remaining copper issues are still unresolved, so manufacturing export was intentionally not generated.
Next steps
  • Complete PCB routing, especially 6V_SERVO/GND power distribution and all signal airwires, then rerun DRC and export Gerbers/BOM/pick-and-place once clean.
Run DRC
Optimize placement
Check connector current
Review stackup rules

Dual PCA9685 Servo Controller

Dual PCA9685 Servo Controller thumbnail