Robotic Arm Board Design

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Decision: I set the manufacturability review to assume a 4-layer production PCB (signal / ground / power / signal) and I will document specific assembly and manufacturing issues and prioritized fixes in the project description. I made this choice to balance EMI control, thermal dissipation, and routing for RMII/Ethernet and multiple motor drivers — it is necessary for a production-capable design in a compact board. I will not modify the schematic or layout; I am only documenting manufacturability issues and recommendations now.

Updated project description

0:14

Updated project description

flux

Session ended. Here’s what was done:
  • Replaced generic capacitors C1–C4 and C7–C8 with real Murata parts
  • Replaced generic resistors and inductors
  • Set MPNs for U1–U10
  • Performed and documented manufacturability review
What remains:
  • C5 and C6 were not replaced (requires user to select and swap Murata GRM1555C1H220JZ01D 22 pF X7R 0603 caps)
Success criteria status:
  • Full schematic and layout review still pending; power rails, motor drivers, MCU integration, and EMI layout have not been validated against criteria.
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U4
U9
U7
U8 OUT - C3 P1
GND GND - J1 GND1
U6 SW - C2 P1
U1 PA6 - U7 SPI_MISO/DIO15
D1 A - U6 VIN
U9 VOUT - C4 P1
L1 P2 - U6 VIN
D1 A - U6 VIN
F1 2 - D2 K
U1 PA7 - U7 SPI_MOSI/DIO16
U1 PA4 - U7 SPI_SSEL/DIO17
L1 P2 - U6 VIN
U8 OUT - C3 P1
U8 OUT - C3 P1
F1 2 - D2 K
U9 VOUT - C4 P1
D1 A - U6 VIN
GND GND - U8 GND
U1 PA5 - U7 SPI_CLK/DIO18
U6 SW - C2 P1
F1 2 - D2 K
GND GND - J1 GND1
GND GND - J1 GND1
L1 P2 - U6 VIN
D1 A - U6 VIN
U1 PA2 - J2 TCT
L1 P2 - U6 VIN
GND
Y1
U8
MH4
TVS1
C3
Capacitance
Capacitance
F1
MH1
U3
L1
Inductance
Inductance
C6
Capacitance
Capacitance
C7
Capacitance
Capacitance
C5
Capacitance
Capacitance
MH2
GND
C2
Capacitance
Capacitance
MH3
GND
GND
C1
Capacitance
Capacitance
GND
C4
Capacitance
Capacitance
C8
Capacitance
Capacitance
C3
Capacitance
0.1 uF
U6
Y2
C2
Capacitance
0.1 uF
U10
R1
D1
C4
Capacitance
0.1 uF
L1
Inductance
2.2uH
C1
Capacitance
100 nF
D2
U5
U2
R1
Resistance
500 Ω
C8
Not Recommended for New Designs
C7
Not Recommended for New Designs

Armed Aqua Electronic Thumb

Armed Aqua Electronic Thumb thumbnail
Manufacturability Review and Remediation Plan for 4-Layer PCB (RMII/Ethernet & RF Module)

Properties

120.0 mm

Zigbee

flowchart LR Vin[24V Input] --> SPD[Surge/ESD Protection] SPD --> RP[Reverse Polarity Protection] RP --> FUSE[Input Fuse] FUSE --> Rail24[24V Rail] Rail24 --> DC5[5V DC/DC] Rail24 --> DC33[3.3V DC/DC] Rail24 --> DC28[2.8V DC/DC] Rail24 --> MD[Motor Drivers (4–6)] FUSE --> PoE[PoE PD Controller] PoE --> DC5 DC5 --> Sensors[5V Sensors] DC33 --> MCU[MCU + External RAM + Ethernet MAC] DC28 --> Camera[2.8V Camera] MCU --> RAM[External RAM] MCU --> ETH[Ethernet PHY/Connector] MCU --> ZB[Zigbee Module (SPI/UART)] MCU --> USB[USB-C/UART IO]

Power-over-Ethernet

USB

160.0 mm

Consumer Electronics

Ethernet

Pricing & Availability

Distributor

Qty 1

Arrow

$0.12–$0.23

Digi-Key

$0.40–$1.17

LCSC

$0.60

Mouser

$0.94

TME

$0.78

Verical

$0.11–$0.18

Controls