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Systems

Elevator dispatch simulator Won

A building and elevator simulator in Rust, written in a hackathon week with one teammate, with cascaded PID control for every car. Our team took 1st place at Boğaziçi AI UpForAChallenge.

Role
Main author
Period
Oct 2024
Team
Team of two
Stack
Rust · Python
Impact
1st place, Boğaziçi AI UpForAChallenge

Building cross-section with four elevator shafts, the cars at their floors and passengers queued at the landings, fed by a small floor-versus-time trace of the last minute, from a small dispatch simulation.

What I did

With one teammate I wrote a building and elevator simulator from scratch in Rust during a hackathon week. Every car runs cascaded PID control: a height loop sets the target speed and a speed loop sets the change in motor current, with anti-windup and a rate limit, updated at a fixed rate. The motor is a kinematic model interpolated from a datasheet-style table, and passengers are generated from hourly traffic data.

I started a small neuroevolution loop for dispatch; it never learned anything useful. It won first place at Boğaziçi AI UpForAChallenge.

Related

Illustration of the method with simulated readings: six Hall sensors on a ring, a distance circle around each, the pairwise intersections nearest the magnet's path, and their average marking the magnet and the shaft angle.

Hall-sensor absolute encoder Archive

An attempt at a cheap absolute encoder for our FRC robot. A ring of Hall sensors around a magnet, and the circle geometry to find the magnet, worked out by hand in C.

Two-camera distance to targets Archive

Distance to the reflective FRC targets from two cheap cameras, without a full stereo calibration. Blobs are paired across the two frames, and distance is fitted against 1/disparity from real measurements.
Illustration of a streaming JSON decoder: a small nested list drawn as an indented tree on a white card, its deeper part boxed in amber as a lazy generator below the max_depth cut, leaving the card through a port beside the root bracket as a stream of token chips on a winding track, with chevrons showing the direction, that runs off to the right.

DBEX Archive

A JSON-compatible encoder and decoder in Python built on generators, so it can stop at a chosen depth and hand back the rest lazily. On PyPI since 11th grade.