Embedded Files
An S-type Load Cell inside a sealed plastic housing measures the force in one arm and transmits it wirelessly to a computer.
Combine two units to measure the imbalance between the two arms!
General Specifications
General Specifications
Dimensions: ~115 X 90 X 55 mm
Maximum Load Rating: 100 kg (220 lb)
Resolution: 0.45 kg (1 lb)
Unit Weight: 1.1 kg (2.43 lb)
Unit Cost of Parts: ~$135 (USD)
Estimated Ingress Protection Rating: IP64
Housing Tests
Housing Tests
Water Test: https://www.youtube.com/watch?v=8t46d5ioKqA
Dust Test: https://www.youtube.com/watch?v=aQ1vRp7iXBg
Electronics
Electronics
The custom-designed printed circuit board (PCB) connects a Bluetooth-compatible microcontroller with a battery, power management board, load cell amplifier, and more in order to create a compact, reliable electronics package!
Electronics Performance:
Electronics Performance:
More than 5 hours of operating time on a full charge!
Charge Time: 5 Hours
General Electronics Overview
MATLAB App
MATLAB App
The accompanying MATLAB app displays the force in each arm as visibly shows the athlete which arm is exerting more force in real time!
It can also calculate the strength difference between in arms after a workout and export the time series for later analysis.
App Performance
App Performance
Mac/Windows Compatible
Sampling Rate:
Mean: 19.7 Hz
Standard Deviation: 3.15 Hz
Lag Time
Upper bound of the time between a measurement and the user seeing it
Mean: 52.0 ms
Standard Deviation: 10.4 ms
App Testing
App Testing
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