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Best Force Sensor or Strain Gauge for Biomechanical Application?

Dylan A last edited by

Hi all, I am looking for suggestions on the best strain gauge or other force sensor to be used in measuring the reaction force between the hand and the wheelchair wheel during wheelchair propulsion. The force Ft which is th reaction force needs to be meaured.

My design includes strain gauges between the pushrim and wheel as seen circled in the picture attached. I need to measure the reaction force so the output will be one vector of voltage. The voltage is a meaure of the force. Anyone have any specific strain gauge suggestions? All help is useful!
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Some humidity sensors are known to lose accuracy with age. For instance, the Si7021 is known to have this problem. If that matters to you, then the best choice is to pick sensors that have datasheets and which have specs as to their expected longevity or accuracy over time. Then buy from mouser/digikey to be certain you're getting the real thing rather than factory rejects or counterfeits. For extra insurance, I avoid electrolytic capacitors entirely whenever possible. I buy only 7XR rated ceramic capacitors that are overspec'd. The difference in price is small compared to a failure down the road.
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It has been a long time but I’ve learned a few things that I wanted to share. This library of information (Thank you NeverDie and others) has been so helpful in my hobby developments. Software Defined Radios for signal analysis. With the help of Andreas Spiess explanation of IQ transformations, I learned about Software Defined Radios and I bought one (RTL-SDR). Using this I can clearly discriminate between effective 433 MHz transmitters and bad ones. Not only is the signal density displayed on the software (SDR#) but so is the frequency. Power Profiler Kit II has been indispensable in watching power usage and seeing into the details of the radio transmission. In effect this thing has saved me from buying an oscilloscope for my simple little bench. Tonight, I saw this video: https://www.youtube.com/watch?v=Z9nycymUd-I It describes common PCB errors. It is too advanced for me, but I did pick-up a few ideas about ground planes (tip #6 from the video). I hope this is of some value for folks.
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hey @dirkc, maybe you can trigger your interrupt to rising and falling edge and use millis() to see how long the press was?
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Best Force Sensor or Strain Gauge for Biomechanical Application?

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Best Force Sensor or Strain Gauge for Biomechanical Application?

Suggested Topics

Update RF24 library to latest version Bug Reports • • andriej

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single-click, double-click, long-press button possible with MySensors? General Discussion • • dirkc

Awesome tip: run LinuxFX instead of Windows! General Discussion • • NeverDie

15Online

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Update RF24 library to latest version
Bug Reports • • andriej

Old hardware migration
General Discussion • • dbemowsk

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General Discussion • • Matt

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General Discussion • • NeverDie

single-click, double-click, long-press button possible with MySensors?
General Discussion • • dirkc

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General Discussion • • NeverDie

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Online

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