I was wondering if my idea would work after my last one failed. Since dollar bills have slight traces of metal in them, I was wondering if you could detect the amount of bills in a certain area based on the strength of the pull. The area would be about 15cm x 7cm x 4 cm. Is there a sensor that can be this accurate? Is this idea possible?
I was thinking if there was any surrounding metal around the device (that would remain stationary) you could just zero out the measurement. I’m sorry if I’m being too broad, but the only thing that I found while doing research is something talking about drug money.