PCB Design Step-by-Step Guide

create a new document Build GLECS V4 Motor Controller PCB. Follow these steps in exact order, complete each step fully before moving to next: STEP 1 — BOARD OUTLINE ONLY: Create board outline 150x100mm. Add 4 mounting holes 3.2mm NPTH at corners (5,5) (145,5) (5,95) (145,95). Nothing else yet. STEP 2 — ISOLATION SLOT ONLY: Draw isolation slot on Edge.Cuts at X=60mm, width 1.5mm, from Y=5mm to Y=95mm. Add keepout rule — absolutely no copper, no traces, no vias within 0.5mm of slot on either side. Confirm slot exists before continuing. This slot divides board into LEFT switching zone (X=0 to X=59mm) and RIGHT logic zone (X=61mm to X=150mm). STEP 3 — PLACE SWITCHING ZONE COMPONENTS (LEFT SIDE ONLY X=2 to X=58): Place these components only in left zone:

J2 screw terminal 3P 5mm LCSC C557652 at X=8 Y=78 (12V power input)
J3 screw terminal 3P 5mm LCSC C557652 at X=8 Y=22 (motor output)
F1 fuse 500mA 1812 LCSC C12559 at X=25 Y=10
D1 SM6T12A TVS LCSC C133698 at X=38 Y=10
K1 SRD-12VDC relay LCSC C30431 at X=28 Y=65
D2 1N4007 diode LCSC C727111 at X=28 Y=48
U5 ULN2003ADR SOIC-16 LCSC C164883 at X=42 Y=55
U4 PC817C DIP-4 LCSC C115500 at X=54 Y=55
R10 330R 0603 LCSC C98220 at X=56 Y=48 Do not place anything in right zone yet. STEP 4 — PLACE LOGIC ZONE COMPONENTS (RIGHT SIDE ONLY X=62 to X=148): Place these components only in right zone:
J1 DC barrel jack LCSC C111567 at X=68 Y=92
U1 AMS1117-5V SOT-223 LCSC C6187 at X=82 Y=78
C1 1000uF radial LCSC C503217 at X=93 Y=78
U9 LMR33630 SOIC-8EP LCSC C1355643 at X=110 Y=90
L1 2.2uH inductor SRN6028 LCSC C167118 at X=125 Y=90
U2 STM32 Blue Pill module at X=105 Y=55
U3 A7672S 4G module at X=130 Y=70
J4 SMA edge connector LCSC C1509229 at X=148 Y=72
U6 DS18B20 TO-92 LCSC C376006 at X=130 Y=34
U7 DHT22 module at X=120 Y=20
U8 ACS724 SOIC-8 LCSC C52034468 at X=100 Y=20
SW1 tactile switch LCSC C406160 at X=72 Y=44
J5 4-pin header LCSC C91552 at X=138 Y=45
J6 6-pin SWD header LCSC C2685206 at X=72 Y=55
Star GND copper pad 4x4mm at X=88 Y=48
Place all decoupling caps 100nF 0603 within 2mm of each IC power pin
Place bulk caps 22uF 0805 near U1 and U9 outputs
R1 1k, R2-R3 4.7k, R4-R5 10k, R6 100k, R7-R8 33k all 0603 near STM32 STEP 5 — ROUTE SWITCHING ZONE ONLY: Route only left zone traces. Stay strictly within X=2 to X=58mm:
12V power rail 1mm trace: J2 pin1 → F1 → D1 → K1 coil pin2
GND_SW rail 0.5mm: J2 pin3 → K1 coil pin1 → U5 GND → D2 cathode
Relay control 0.5mm: U5 output → K1 coil
Relay output 1mm: K1 NO contact → J3
D2 flyback across K1 coil pins Do not route any trace that crosses X=60mm yet. STEP 6 — ROUTE LOGIC ZONE ONLY: Route only right zone traces. Stay strictly within X=62 to X=148mm:
12V rail 1mm: J1 → F1 area → U1 input → U9 input
5V rail 0.8mm: U1 output → C1 → STM32 VIN
Buck rail 0.8mm: U9 output → L1 → U3 power
GND 0.5mm: all logic GND to star ground pad at X=88 Y=48
UART 0.25mm: STM32 PA9 PA10 → U3 RX TX
Sensor 0.25mm: STM32 PA2 → U6, PA3 → U7, PA0 → U8
I2C 0.25mm: STM32 PB6 PB7 → J5
SWD 0.25mm: STM32 PA13 PA14 → J6
RF 1mm 50ohm: U3 antenna → J4 SMA Do not route any trace that crosses X=60mm yet. STEP 7 — ROUTE ISOLATION CROSSING LAST: Only one signal crosses the isolation slot — route it now:
STM32 PA1 → R10 330R → U4 PC817 LED anode (logic side)
U4 PC817 collector → U5 ULN2003 input (switching side) These traces enter and exit through the PC817 pins which are the ONLY legal crossing point. STEP 8 — COPPER POURS:
Bottom layer left zone: solid GND_SW copper pour
Bottom layer right zone: solid GND copper pour
No copper under A7672S antenna area STEP 9 — DRC AND FIX: Run full DRC. Fix every single error. Verify isolation slot has 0.5mm clearance. Target 0 errors. STEP 10 — EXPORT: Export Gerber ZIP for JLCPCB. Export BOM CSV with Comment Designator Footprint LCSC-Part-Number Qty columns. Export CPL CSV with Designator Mid-X Mid-Y Layer Rotation columns — coordinates as plain numbers no mm units

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I’ll create the PCB build document, then apply the board outline, slot/keepout, placement, routing, DRC fixes, and manufacturing exports in the exact order you specified, validating each phase before moving on.

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Create outline first

Verify footprints first

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GND

J1 VBUS - J1 VBUS

J1 VBUS - U10 VBUS

J1 DN1 - J1 DN2

J1 VBUS - J1 VBUS

J1 DP1 - J1 DP2

J1 CC1 - U10 CC1

J1 DN1 - J1 DN2

J1 CC2 - U10 CC2

J1 DP1 - J1 DP2

Reviews

Generic Inductor
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Project Name

Description

Industrial 415V 3-phase motor control interface with STM32 command logic, SIMCom A7672S 4G SMS control, isolated relay driver, 12V input power, and 150x100mm 2-layer PCB constraints.

Properties

Properties describe core aspects of the project.

Pricing & Availability

Distributor	Qty 1
Arrow	$1.85–$2.42
Digi-Key	$6.60
HQonline	$1.32–$1.78
LCSC	$6.16–$6.43
Mouser	$4.64
TME	$4.94
Verical	$0.33–$0.57

Controls

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