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