How ATM (automated teller machine) count the notes ?

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kseng2002

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how does a machine count notes

Does any1 know how ATM (automated teller machine) count the notes ? What sensors does ATM use ? Any1 have any ideas ? Can provide any block diagram of it ? Thanks in advance.
 

atm sensing thickness bill pdf

ATM's use LVDT(Linear variable differential transformer) for sensing the bills. They measure the thickness of the bill and detect if 2 or more bills stick together etc.
**broken link removed**
 

LVDT's - fiddlesticks!!

They have a little man inside them, he does all the counting & giving out of money.
If he does not like the look of you on his monitor he will keep your card & not let you have any money.
 

Hi, is it only LVDT ? No other sensor ? Thx in advance ~
 

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