I want to find a linear relationship between stacked iron blocks, one by one on top of each other, and some electrical property. Then create a arduino circuit that could precisely determine the number of blocks stacked on top based on the relation. What electrical property should I be measuring? I was thinking creating a EC probe but the sensitivity may not be very precise.
Any ideas on how to get a linear relationship between the number of iron blocks stacked on top of each other and some electrical property?
I have one base iron block which will have the circuit internally built in, and then 5 iron blocks, each should have some identifiable electrical variable as they are stacked.
Load cells would not be possible for this project since the circuit is internally positioned within one of the iron blocks (the base block).
The dimensions are around 15cm (lenght) x 20cm (width) x 5cm (height). The surface black oxide, there is no way to have a transducer over the stack
I think the best way to do it would be to use a coil to find magnetic field pulses, but the coil diameter might be quite small and not sure if there would be sensitivity with more blocks added, unless there are some other design idea with the coil, possible short circular but long vs large circular diameter?
The objective is to count the number of iron blocks up to a total of 5.