LED Blinker Circuit Design
Thought for 5 sec
Here is the latest Gerber ZIP export:
show me where is 4g module
J_4G
Thought for 7 sec
The original A7672S 4G module footprint was removed from the design and replaced with a 4-pin external 4G header.
You should look for:
- Designator:
J_4G - Type: 4-pin 2.54 mm vertical header
- Location: near the right edge of Zone 2
- Pins:
VCC_5V,GND_STAR,LTE_TX,LTE_RX
So there is no large 4G module on the PCB now — the board provides
J_4G so you can connect an external 4G module by wires/header.Highlight J_4G
Export 4G wiring
Verify 4G nets
Add silkscreen labels
Run final review
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PCB Placement Summary
Board coordinate convention in this summary: user board coordinates are measured from the top-left of the 150 mm × 100 mm board: x increases left-to-right, y increases top-to-bottom. Flux internal coordinates are board-center origin: x = user_x − 75, y = 50 − user_y.
Zone 1 — Switching
Table
| Component | Requested user coordinate | Applied Flux coordinate | Notes |
|---|---|---|---|
| K1 SRD-12VDC relay | x=25, y=50 | x=-50, y=0 | Center of Zone 1 |
| U_OPTO1 PC817 | x=45, y=35 | x=-30, y=15 | Near slot / between relay and slot |
| Q1 BC547 | x=50, y=45 | x=-25, y=5 | Close to PC817 |
| D2 1N4007 | x=25, y=30 | x=-50, y=20 | Near relay coil |
| R9 1k | x=52, y=30 | x=-23, y=20 | Near PC817 input |
| R10 4.7k | x=48, y=55 | x=-27, y=-5 | Near opto/transistor area |
| R11 10k | x=50, y=55 | x=-25, y=-5 | Near opto/transistor area |
| J1 12V RELAY DRIVE | x=10, y=15 | x=-65, y=35 | Left/top board edge |
| J2 STARTER COIL COMMAND | x=10, y=80 | x=-65, y=-30 | Left/bottom board edge |
Zone 2 — Power Cluster
Table
| Component | Requested/user intent | Applied Flux coordinate | Notes |
|---|---|---|---|
| J_PWR | x=70, y=5 | x=-5, y=45 | Top edge |
| F1 | x=80, y=18 | x=5, y=32 | Near input |
| D_TVS | x=85, y=18 | x=10, y=32 | Near input protection |
| U_5V AMS1117-5V | x=90, y=30 | x=15, y=20 | Power cluster |
| C_RES | x=80, y=35 | x=5, y=15 | Reservoir cap |
| C1 | within 3 mm of U_5V | x=12, y=22 | AMS1117 input/output bypass cluster |
| C2 | within 3 mm of U_5V | x=18, y=17 | AMS1117 output cap |
| C3 | within 3 mm of U_5V | x=18, y=23 | AMS1117 output bypass |
| U_3V3 | near 5V regulator | x=20, y=8 | Added 3.3V regulator near logic power |
| C18 | near U_3V3 | x=16, y=6 | 3.3V regulator cap |
| C19 | near U_3V3 | x=24, y=6 | 3.3V regulator cap |
| U_4V LMR33630 | x=105, y=20 | x=30, y=30 | 4V LTE regulator |
| L1 | x=115, y=20 | x=40, y=30 | Near LMR SW node |
| C4 | within 3 mm of U_4V | x=27, y=35 | LMR input cap |
| C5 | within 3 mm of U_4V/output path | x=35, y=25 | LMR output cap |
| C6 | within 3 mm of U_4V | x=27, y=25 | LMR output bypass |
| C_BOOT | near U_4V | x=33, y=34 | Bootstrap cap |
| C_VCC | near U_4V | x=33, y=26 | VCC bypass |
| R_FB1 | near U_4V FB | x=38, y=24 | Feedback divider |
| R_FB2 | near U_4V FB | x=42, y=24 | Feedback divider |
Zone 2 — MCU Cluster
Table
| Component | Requested/user intent | Applied Flux coordinate | Notes |
|---|---|---|---|
| U_MCU STM32F103C8T6 | x=105, y=55 | x=30, y=-5 | Center of logic zone |
| Y1 crystal | within 5 mm of STM32 OSC pins | x=25, y=-8 | Near MCU |
| C7 | within 2 mm of VCC pin | x=25, y=0 | MCU decoupling |
| C8 | within 2 mm of VCC pin | x=35, y=0 | MCU decoupling |
| C9 | within 2 mm of VCC pin | x=25, y=-10 | MCU decoupling |
| C10 | within 2 mm of VCC/VBAT pin | x=35, y=-10 | MCU decoupling |
| C11 | within 2 mm of VDDA | x=31, y=-13 | VDDA cap |
| C12 | within 2 mm of VDDA | x=34, y=-13 | VDDA cap |
| C13 | at crystal | x=22, y=-10 | Crystal load cap |
| C14 | at crystal | x=22, y=-6 | Crystal load cap |
| R1 | near NRST | x=22, y=-2 | Reset pullup |
| C_RST | near NRST | x=22, y=2 | Reset cap |
| TP_RST | near NRST | x=18, y=-2 | Reset test point |
| R2 | near BOOT0 | x=38, y=-15 | BOOT0 pulldown |
| J_SWD | x=130, y=90 | x=55, y=-40 | Bottom/right accessible |
| J_DEBUG | x=145, y=50 | x=70, y=0 | Right edge accessible |
Zone 2 — 4G Cluster
Table
| Component | Requested user coordinate | Applied Flux coordinate | Notes |
|---|---|---|---|
| J_A7672S | x=125, y=40 | requested x=50,y=10; clamped to x=24.07,y=10 | Large 2×20 header was clamped by board bounds to keep footprint on board |
| J_SIM | x=140, y=70 | requested x=65,y=-20; clamped to x=51.09,y=-20 | Large SIM holder clamped by board bounds |
| J_ANT1 | x=148, y=10 | requested x=73,y=40; clamped to x=72.52,y=40 | Top-right antenna connector at board edge |
| C15 | within 3 mm of module VCC pins | x=42, y=12 | LTE bulk cap |
| C16 | within 3 mm of module VCC pins | x=42, y=8 | LTE bypass cap |
| R3 | near LTE UART | x=39, y=2 | Series resistor |
| R4 | near LTE UART | x=39, y=-2 | Series resistor |
| R5 | near PWRKEY | x=43, y=0 | Series resistor |
| R6 | near RESET | x=43, y=-4 | Series resistor |
| R7 | near STATUS | x=48, y=-2 | STATUS resistor |
| R8 | near D1 | x=52, y=-5 | LED resistor |
| D1 | near STATUS LED path | x=56, y=-5 | Green status LED |
| C17 | near PWRKEY | x=45, y=3 | PWRKEY debounce cap |
Zone 2 — Sensor Cluster
Table
| Component | Requested/user intent | Applied Flux coordinate | Notes |
|---|---|---|---|
| U_ACS712 | x=80, y=75 | x=5, y=-25 | Bottom sensor/current cluster |
| J5 | x=70, y=85 | x=-5, y=-35 | Bottom edge current terminal |
| J3 | x=100, y=95 | requested x=25,y=-45; clamped to x=25,y=-41.15 | Bottom edge; clamped to keep terminal on-board |
| J4 | x=115, y=95 | requested x=40,y=-45; clamped to x=40,y=-41.15 | Bottom edge; clamped to keep terminal on-board |
| J_OLED | x=130, y=75 | x=55, y=-25 | Bottom/right sensor header |
| U_DS18B20 | near J3 | x=20, y=-35 | Sensor interface/reference part |
| C22 | near DS18B20 | x=22, y=-38 | DS18B20 decoupling |
| U_DHT22 | near J4 | x=36, y=-35 | Sensor interface/reference part |
| C23 | near DHT22 | x=38, y=-38 | DHT22 decoupling |
| C20 | near ACS712 VOUT | x=10, y=-22 | VOUT filter cap |
| C21 | near ACS712 FILTER | x=10, y=-28 | FILTER cap |
| R12 | near DS18B20 data | x=25, y=-38 | 1-Wire pullup |
| R13 | near DHT22 data | x=40, y=-38 | DHT22 pullup |
| R14 | near OLED/I2C | x=50, y=-18 | SCL pullup |
| R15 | near OLED/I2C | x=60, y=-18 | SDA pullup |
Verification Notes
- Board is confirmed 150 mm × 100 mm, 2-layer.
- All listed physical components are on the top layer.
- The placement tool clamped large edge components to keep their footprints inside the board: J_A7672S, J_SIM, J_ANT1, J3, and J4.
- Zone 1 components are all left of the isolation slot area.
- Zone 2 components are all right of the isolation slot area.
- A 15 mm × 15 mm antenna keepout at the top-right corner remains a routing/fill rule item to enforce before copper pours/routing if not already represented by board keepout geometry.
- DRC airwire errors are expected because routing has not been performed yet; this step was placement only.
Zone 1 — Switching
Zone 2 — Power Cluster
Zone 2 — MCU Cluster
Zone 2 — 4G Cluster
Zone 2 — Sensor Cluster
Verification Notes
