Fabrication Readiness

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Verification is only partially complete:
J12 exact pinout
  1. 5 V
  2. GND
  3. I²C SCL
  4. I²C SDA
  5. ESP32 TX — GPIO9, connect to display RX
  6. ESP32 RX — GPIO10, connect to display TX
  7. 3.3 V
  8. HMI enable/spare — GPIO14
Power
The 5 V source is the DFRobot DFR0379 LM2596 buck module, but the project does not identify the 7-inch display or its maximum current. Therefore, available current margin cannot yet be confirmed safely.
Connector and clearance
J12 is a vertical Samtec SSW-108-02-G-S 2.54 mm female socket, not a locking cable connector. It is approximately 21.35 × 3.55 mm and located inside the board rather than at an edge. The vertical mating direction is clear, but exact cable/plug clearance cannot be validated without the mating connector housing and cable exit direction.
Please provide the 7-inch display model/MPN or product link and the intended mating cable/connector. Those two items are required for an exact current and mechanical-clearance verdict.
M

mateti

myy pcb size

flux

Your PCB size is 160 mm × 185 mm.
  • Area: 29,600 mm²
  • Approximate imperial size: 6.30 × 7.28 inches
  • Stackup: 4 layers
  • Board thickness: approximately 1.30 mm
Check exact J12 pinout
Size 5V rail margin
Check connector clearance
Cross-check display power

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Files

Schematic

Layout

3D View

PCB Component Placement Preview
Board Preview Setup
  • Board size: 140mm × 160mm rectangle, 4-layer stackup.
  • Routing: not performed. This is a placement-only preview.
  • Placement intent: top-view functional zone organization with generous routing space.
Functional Zones

Table

ZoneComponents
Top Left: 12V Power InputJ1 DC barrel jack, F1 fuse, D1 reverse-polarity Schottky, D3 TVS, U2 LM2596, R9/R10/R11 power LEDs, R12/R13/R14 LED resistors
Top Centre: ESP32 DevKitU1 ESP32 DevKit, SW1 reset, J4 programming header, C6-C12 local/bulk capacitors
Top Right: ESP32-CAMU7 ESP32-CAM module/connector, antenna facing outward where possible
Left Edge: Sensor ConnectorsJ2 MQ-2, U3 DHT11, J3 flame sensor, U4 DS18B20, U5 MLX90640; R7/R8 MQ-2 divider, R6 DHT11 pull-up, R1 DS18B20 pull-up, R4/R5 I2C pull-ups nearby
Right Edge: Output ConnectorsK1 fan relay, K2 aerosol relay, BZ1 buzzer
Bottom Edge: DisplayU6 OLED / display connector
Placement Notes
  • Power input is grouped away from sensor/logic areas.
  • ESP32 controller is centered in the upper-middle of the board for short routes to sensors, display, camera, and outputs.
  • Relays are on the right edge, physically separated from the MQ-2 analog divider.
  • OLED/display connector is placed on the bottom edge.
  • I2C devices and pull-ups are placed to keep the SDA/SCL path reasonably short.
Current Preview Limitations
  • No traces have been routed yet.
  • Some DRC overlap reports remain from existing footprint/sub-layout internals, especially around the MLX90640 module sublayout and pre-existing internal geometry. These must be resolved before routing/manufacturing.
  • U5 MLX90640 appears as a module with internal child elements; it may need footprint/sublayout cleanup before final routing.
Next Step
Approve the placement preview, then resolve footprint/sub-layout issues before routing.

  • Board Preview Setup

  • Functional Zones

  • Placement Notes

  • Current Preview Limitations

  • Next Step