PCB Design for Industrial Machine Retrofit

flux

Work done
  • Completed the shared DRV8825 wake/reset network by tying Q2 NSLEEP + NRESET and Q3 NSLEEP + NRESET onto a common DRV_WAKE net with pull-up via R18, and also absorbed existing pull-ups on R3 and R7
  • Completed the 12 V protection/power path wiring in schematic for F1, Q1, D1, C25, C15, C26, and C27, including VMOT feed onto both drivers
  • Connected the IMU module U5 to 3.3 V, I2C_SCL, I2C_SDA, and IMU_INT1, and grounded the unused auxiliary pins
  • Updated component metadata to reflect the intended fuse MPN on F1 and 3.3 V operation on OLED1
  • Enforced explicit layout manufacturing constraints by reapplying a Standard 4 Layer stackup and adding top-level layout minimums for trace width, keep out, and board inset margin
Success criteria review
  • ✅ Shared DRV8825 RESET/SLEEP net with pull-up is integrated on Q2, Q3, and R18
  • ✅ VMOT feed and local decoupling were connected for Q2, Q3, C26, and C27
  • ✅ The 12 V protection chain components are now integrated in schematic around F1, Q1, D1, and C25
  • ✅ U5 is wired onto the intended I2C bus with pull-ups already present on R9 and R10
  • ✅ The layout is explicitly configured as 4-layer with minimum manufacturability rules set
  • ❌ I could not clear all floating-pin/ERC issues because the project still contains many pre-existing disconnected parts and unresolved support components, including C5, C6, C7, C8, C9, C10, C13, C14, R5, R6, and R17
  • ❌ I could not make the board manufacturing-ready because PCB routing airwires remain very high (122), and this environment does not provide a tool to manually route traces or invoke the user-side auto-layout workflow on your behalf
  • ❌ Critical verification is still blocked by stale/unreconciled review results for several just-wired parts, so I cannot honestly certify full ERC/DRC closure
Next steps The schematic is materially closer, but this is not yet manufacturing ready. The remaining work is to finish wiring or remove the still-floating support parts, then route the PCB airwires and rerun review until errors clear. If you want, I can continue with another cleanup pass focused on the remaining floating schematic parts next.
hassan75

hassan75

Connect the MPU6050 VIN, SCL, SDA, and INT nets to the ESP32 and OLED bus.

flux

Those connections are already in place now:
  • U5 VIN is tied to the P3V3 rail, which also powers U4 and the UART header rail
  • U5 SCL is connected to the shared I2C_SCL net with U4 IO22, OLED1 SCL, and pull-up R10
  • U5 SDA is connected to the shared I2C_SDA net with U4 IO21, OLED1 SDA, and pull-up R9
  • U5 INT is connected to the IMU_INT1 net going to U4 IO19
So the MPU6050-to-ESP32/OLED bus hookup you requested is complete. The remaining work is not these four nets; it’s the other unresolved schematic/layout cleanup items still left in the project.
hassan75

hassan75

The I2C system (MPU6050, OLED, and ESP32 connections) is already correctly implemented and should NOT be modified.
Focus only on completing the remaining schematic and PCB cleanup tasks to reach full manufacturing readiness.
REMAINING CRITICAL TASKS:
DRV8825 FINAL FIX:
  • Resolve any unresolved RESET and SLEEP pin connections:
    • Ensure RESET and SLEEP are tied together for each driver
    • Ensure they are pulled up to 3.3V using a 10kΩ resistor
    • Eliminate any floating or unconnected control pins
POWER INTEGRITY VERIFICATION:
  • Verify all power nets:
    • 12V input rail
    • 5V rail from buck converter
    • 3.3V rail for logic
  • Ensure all required capacitors are properly placed:
    • Bulk capacitors (≥100µF) near motor drivers
    • Input capacitor (≥220µF)
    • 0.1µF decoupling capacitors near every IC
  • Ensure proper return paths and no broken ground connections
MOTOR POWER COMPLETION:
  • Confirm VMOT connections for both DRV8825 drivers are properly routed
  • Ensure high-current paths are continuous and correctly connected
  • Verify motor connectors are fully wired with no missing nets
REMOVE ALL AIRWIRES:
  • Identify and complete ALL remaining unrouted connections
  • Ensure there are zero airwires in the design
ELIMINATE FLOATING PINS:
  • Ensure no pins are left unconnected unless explicitly intended
  • Add pull-up or pull-down resistors where required
PCB LAYOUT CLEANUP:
  • Optimize component placement to reduce routing complexity
  • Group functional blocks:
    • Power section
    • Motor drivers
    • ESP32 logic
    • Sensors
  • Ensure proper separation between:
    • High-current motor paths
    • Sensitive signal lines
ROUTING IMPROVEMENTS:
  • Use wide traces for motor current paths
  • Keep I2C and signal traces short and clean
  • Avoid routing motor or switching lines under ESP32 or MPU6050
  • Ensure proper ground plane continuity
FINAL VALIDATION:
  • Pass ERC with no critical errors
  • Pass DRC with no violations
  • Ensure design is fully connected, stable, and ready for manufacturing
GOAL: Finalize the PCB into a clean, complete, and reliable industrial-grade design with no unresolved connections or layout issues.
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ESP32 Lathe Retrofit Controller thumbnail
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