Motion Analysis & Speed System. A forensic-grade physics laboratory disguised as a Hot Wheels track speedometer. Measures race timing, velocity, and physics calculations for 1:64 scale vehicles with sub-millisecond accuracy.

What it is

M.A.S.S. Trap began as a sixth-grade science fair project and became a real piece of laboratory-grade timing hardware. It uses paired ESP32-S3 microcontrollers communicating over ESP-NOW with microsecond-synchronized clocks to time car races, calculate velocity at the start, midpoint, and finish, and run physics teaching mode that surfaces kinematic equations alongside the measurement.

How it works

Paired wireless devices form a start gate and a finish gate, with an optional middle speed-trap. The start gate detects the vehicle and triggers the race; the finish gate captures the finishing timestamp, calculates elapsed time, derives velocity and acceleration, drives visual LED feedback, plays audio cues, and serves a live race dashboard on the local network. The two gates synchronize clocks continuously so that race times are accurate to the microsecond regardless of drift between devices.

Status

Currently in active use at home and demonstrated at a school science fair, where it produced timing data accurate enough to detect kinematic anomalies in the launch ramp itself.

What it's for

M.A.S.S. Trap is a personal hardware project published under Massfeller LLC. It is not for sale. The firmware may be open-sourced in the future under a permissive license; if and when that happens, the announcement will live on this page.

Privacy

M.A.S.S. Trap operates entirely on the local network and does not transmit telemetry to any remote service. The web dashboard is served by the device itself on the local network with authentication required. No personal data is collected.

Support

For questions about M.A.S.S. Trap, write support@massfellerllc.com.