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How ATM machines work.
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Previously:
https://www.homemadetools.net/forum/...721#post216482
It's an Automated Teller Machine machine?
Yeah, it's like a hot water heater.
PIN number
It would be interesting to know how the doubled bill sensor works. Maybe shining a light through the bill(s) and detecting the lower intensity when two bills are present?
Also, what does it do when a doublet is detected ?
I've never experienced an error from an ATM. Which is good, since one has no recourse if it were to happen. I can just imagine going into the bank and asking them to take my word for the fact that the machine only delivered $80 when I requested $100.
Sir, your balance was only $60. You now owe us $45...
Yeah. The thing is, if it errored on your transaction, it likely would have before, or will soon again. I used to work on paper-handling gear, and found that the mis-picks generally travel in packs.