Enclosure Design

Enclosure is roughly 17" × 12" × 8" with 0.5" walls throughout, sized to fit a typical parcel while staying small enough to be practical. Wall thickness came from the stock we had on hand rather than from analysis; this was a prototype, and available material drove a fair amount of the geometry.

CAD remodeled for documentation; original prototype built in wood, Spring 2024.

Internal Barrier

Internal barrier separating the electronics from the package compartment (11" wide to span the internal width, 4" tall, 0.5" thick). We chose to use a wall inside the compartment, but the wiring running from the keypad down to the solenoid lock had to pass through the same region.

This took some design iterations to resolve, until the barrier geometry and position cleared the wiring while still separating the two compartments.

Lock Integration

The lock was a solenoid latch from an Arduino kit, with only a few millimetres of bolt throw, so the door and mounting geometry had to be built around it for the bolt to seat and hold.