Friday 22 January 2016

circuit design - Measuring weight on a gym machine



We're doing a school project where we have to measure weight on a fitness machine.


enter image description here


The user can select how many weight plates to use by moving a rod like shown in the picture.


How would you do it?


We've talked about the following solutions:



  • a strain gauge measurement unit beneath the stack, be we doubt that it will be robust, and it will be expensive.


  • an IR distance sensor that counts the spaces between each plate.

  • inductive proximity sensors

  • Some kind of electromagnetic solution?




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