PCB Assembly

The PiTrac system requires a custom “Connector Board” - a small printed circuit board that handles connections between the Pi computers, cameras, and LED strobe system.

Connector Board Overview

The Connector Board is the only custom electronic component in PiTrac. It:

• Provides signal isolation between systems
• Controls LED strobe timing
• Manages camera trigger signals
• Interfaces Pi computers with external hardware

Manufacturing the PCB

Design Files

The PCB design files are available in the main PiTrac repository under:

• Hardware/Connector Board/ directory

Fabrication

• Cost: A few dollars from most PCB manufacturers
• Complexity: Through-hole components only (no surface mount)
• Quantity: Only one board needed per PiTrac system

Popular PCB manufacturers include:

• JLCPCB
• PCBWay
• OSH Park
• Any local PCB fabrication service

Component Assembly

Required Components

See the detailed component list in the Parts List.

Key components include:

• H11L1 optocouplers (2x)
• 74HC04 hex inverter
• Dual MOS driver module
• Various resistors and connectors

Assembly Tips

1. Use sockets: Install DIP sockets for the optocouplers and hex inverter to protect against heat damage during soldering

2. Component orientation: Pay careful attention to IC orientation and polarity

3. Soldering order:
   • Install sockets first
   • Add resistors
   • Install headers and connectors
   • Insert ICs into sockets last
4. Testing: Test continuity and check for shorts before connecting to Pi systems

Connection Diagram

Refer to the PCB wiring diagram in the Assembly Guide for proper connections to:

• Pi GPIO pins
• LED power supply
• Camera trigger signals
• Power input

Troubleshooting

• No strobe pulse: Check power connections and MOS driver module
• Camera not triggering: Verify optocoupler installation and GPIO connections
• System instability: Ensure proper grounding and power isolation

For detailed wiring instructions, see the Assembly Guide.