For a class project, I'm working with a weight stack:
I'm trying to simultaneously measure:
- the position of a moving weight stack
- the value of the weight based on a calibrated/preloaded position in the stack, not via load sensor. (e.g. think a stack of plate weights where the sensor knows in advance that 1 plate = 10lbs, 2 plates = 20lbs, etc.)
The weight stack and the base camp chip/sensor/laser would be within two feet of the weight stack, so I don't need anything overly strong. My requirement is that it is small/unobtrusive and cost effective. I've looked into a few options, but I'm not an engineer so I'm not sure if I am on the right track.
How would you do this? Is there any research that I could check out?