LED Blinking Circuit Design

flux

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
Sign up to send
  • Generic Inductor
    Generic Inductor
    A generic fixed inductor suitable for rapid circuit topology development. The footprint automatically adapts based on the selected package, supporting standard SMD sizes (e.g., 0402, 0603, 0805) as well as well-known inductor packages such as SDR1806, PA4320, SRN6028, and SRR1260. Standard inductor values: 1.0 nH, 10 nH, 100 nH, 1.0 µH, 10 µH, 100 µH, 1.0 mH 1.2 nH, 12 nH, 120 nH, 1.2 µH, 12 µH, 120 µH, 1.2 mH 1.5 nH, 15 nH, 150 nH, 1.5 µH, 15 µH, 150 µH, 1.5 mH 1.8 nH, 18 nH, 180 nH, 1.8 µH, 18 µH, 180 µH, 1.8 mH 2.2 nH, 22 nH, 220 nH, 2.2 µH, 22 µH, 220 µH, 2.2 mH 2.7 nH, 27 nH, 270 nH, 2.7 µH, 27 µH, 270 µH, 2.7 mH 3.3 nH, 33 nH, 330 nH, 3.3 µH, 33 µH, 330 µH, 3.3 mH 3.9 nH, 39 nH, 390 nH, 3.9 µH, 39 µH, 390 µH, 3.9 mH 4.7 nH, 47 nH, 470 nH, 4.7 µH, 47 µH, 470 µH, 4.7 mH 5.6 nH, 56 nH, 560 nH, 5.6 µH, 56 µH, 560 µH, 5.6 mH 6.8 nH, 68 nH, 680 nH, 6.8 µH, 68 µH, 680 µH, 6.8 mH 8.2 nH, 82 nH, 820 nH, 8.2 µH, 82 µH, 820 µH, 8.2 mH #generics #CommonPartsLibrary
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  • Generic Capacitor
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  • Generic Resistor
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Dual PCA9685 Servo Controller thumbnail
Dual PCA9685 servo controller PCB for Raspberry Pi 5 and STM32 Nucleo with 16 servo outputs, 5.1V logic, 6V/20A servo power, and 4-layer layout.

Properties

A

Pricing & Availability

Distributor

Qty 1

Arrow

$0.23–$0.28

Digi-Key

$1.91–$2.58

LCSC

$2.21

Mouser

$2.49

TME

$0.50

Verical

$1.74–$1.77

Controls