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Gym / Sports Peak G-Force & Impact Meter
Professional safety testing equipment starts at $13,000. I'd like to build a cheap g-force meter to measure the effectiveness of pads.
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Maybe use a pressure (aka "force") sensitive resistor
Example: https://www.adafruit.com/product/166
Example: https://www.adafruit.com/product/1075
Example: https://www.adafruit.com/product/1071
Or a flex sensor (how much does the padding, foot or shoe bend)?
Example: https://www.adafruit.com/product/182
Or use a accelerometer (such as the one on an Adafruit Circuit Playground) or other form of IMU on a wearable and see if there's a way to determine impact "thuddiness" from that? More padding = less thuddiness.
Example: https://learn.adafruit.com/circuit-playground-lesson-number-0/accelerometer
Note: I posted Adafruit examples because I remembered they had them, but you can get loads of alternatives from other vendors (likely much cheaper too).