A compact biomechanical dynamometer and adjustable strengthening device for the hand and wrist. Built to measure force and motion, then stream the data to a companion app.
BrownAI Studio
PMARC began as a NASA Space Grant funded research project for astronaut resistance training, where long stretches in microgravity erode muscle and bone. Now an independent project, its core is a compact variable-resistance mechanism, the backbone for hand and wrist training, rehabilitation, and actuator systems. An embedded module captures force, repetition, and range of motion as quantitative data.
Resistance is continuously adjustable across a wide range, so one mechanism spans light rehabilitation loads through full training loads in a single unit.
Each rotation loads the internal resistance mechanism, engaging the fingers, hand, and wrist together through one compact and repeatable range of joint motion.
A calibrated load path measures applied force in newtons, sampled continuously across every repetition, so progress is quantified rather than estimated.
An onboard motion sensor tracks the orientation and range of motion of the hand and wrist, resolving how each repetition was performed, not just its load.
The companion app connects to the cube wirelessly, plots the live force signal, records timed sessions with peak and average force, and exports the data as CSV for later analysis. Clean, fast, and built around the metrics that matter.
Note: the first production cube is the adjustable trainer only. Force sensing and app pairing arrive with the next version of the cube.
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