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Creating a good bill changer is a tough problem. The device has to work with all sorts of bills, from crisp new ones to ragged old ones, and it has to be reasonably good at telling real bills from fakes. In many cases, the changer also has to be able to sense the denomination of the bill. In order to accomplish these tasks, dollar bill changers use a variety of technologies. Several different patents listed below discuss techniques that people have employed. Some of these techniques have changed over the years as microprocessors have allowed more capability in the device.
Here are several of the techniques that have been tried:
- Many of the early bill changers took advantage of the fact that U.S. bills are printed with magnetic ink. They could therefore use magnetic heads (like the ones in a cassette tape recorder) to pick up signals from the bills. Areas of the bill (like the background behind the president's face) would generate signals at a specific frequency, and the detection of this frequency would validate the bill. Different bills generate different frequencies, so the frequency can also help determine what the denomination is.
The backgrounds from behind the president's face on a $1, $5 and $10 bill: Note the different spacing used in each one. The spacing can help determine the denomination. - Genuine dollar bills have a certain conductivity, and checking for the resistance of a bill can authenticate it.
- Inks and papers have different fluorescent properties, and these properties can help tell real from counterfeit bills.
- The optical properties of a bill, or a strip of a bill, can be sensed with a photocell or a camera and compared to valid patterns stored in memory. Different patterns from different bills can determine the denomination.
These links will help you learn more:
- Patent #3,870,629: Paper Currency Validator
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Qthread slot example. We’ve all seen, and occasionally wrestled with, bill acceptors like the one [Another Maker] recently liberated from an arcade machine. But have you ever had one apart to see how it works? If not, the video after the break is an interesting peak into how this ubiquitous piece of hardware tells the difference between a real bill and a piece of paper.
But [Another Maker] goes a bit farther than just showing the internals of the device. He also went through the trouble of figuring out how to talk to it with an Arduino, which makes all sorts of money-grabbing projects possible. Even if collecting paper money isn’t your kind of thing, it’s still interesting to see how this gadget works on a hardware and software level.
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As explained in the video, a set of belts are used to pull the bill past an array of IR LEDs. The hardware uses these to scan the bill and perform some dark magic to determine if it’s a genuine piece of currency. [Another Maker] notes that these readers actually need to receive occasional firmware updates to take into account new bill designs. In fact, the particular unit he has is so out of date that it won’t accept modern $5 bills; which may explain how he got it for free in the first place.
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Years ago we saw one of these bill acceptors used to make a DIY Bitcoin ATM. Of course back then, a few bucks would get you a semi-reasonable amount of BTC. These days you would skip the paper currency and do it all digitally.