System Architecture
The final project integrates mechanical singulation, optical imaging, electronic control, and embedded software into one automated platform.
- Rotary V-groove alignment disk
- IR grain presence detection
- Stepper motor indexed control
- Mirror-based multi-view imaging chamber
- Raspberry Pi image acquisition
- Dump zone for automatic cycling
Design Strategy
Conceptual, preliminary, and detailed design phases were followed. Controlled orientation is achieved using V-groove geometry. Indexed rotation ensures deterministic synchronization between motion and imaging.
Design for Manufacturing
- Standard stepper motor components
- 3D printed near-net rotary disk
- Minimal part count
- Self-aligning motor hub
- Fasteners preferred over adhesives
Packaging & Alignment
Mechanical alignment ensures coaxial rotation. Wire routing avoids interference with moving parts. Mirror chamber uses matte internal finish. PCB mounted using insulated standoffs.
Testing & Validation
- Single-grain success rate evaluation
- Shake testing for vibration tolerance
- Cycle testing for durability
- Sensor accuracy verification
Failure Modes
- Mechanical misalignment
- Stepper torque insufficiency
- Sensor misdetection
- Power transient noise
- Software race conditions
Repair & Modularity
The system is modular: disk, camera, and electronics are detachable. Standard fasteners enable right-to-repair and component reuse.
Lifecycle & Sustainability
Design supports disassembly, reuse, and recyclable thermoplastics. End-of-life separation considered during mechanical design.