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<p>[QUOTE=&quot;chrisild, post: 579062, member: 39&quot;]The technology to recognize a coin design is there, the question in, how many vending machines actually use it? Most vending machines check the diameter, weight, edge and composition. Others also have sensors for the electric conductivity and magnetic properties of inserted coins - the more valuable the merchandise is that you can get out of such a machine, there more interesting it gets to use such checks.</p><p><br /></p><p>Modern machines may use light to &quot;read&quot; the design of a coin. After all, each coin design has its ups and downs ... I mean, specific areas of a piece will be raised, others are not. You can check an inserted coin by emitting light (RGB), and depending how it is reflected (this would be &quot;read&quot; by a camera), the coin is OK or not.</p><p><br /></p><p>One problem is to find the right path between being very sensitive and very tolerant - you want to refuse &quot;wrong&quot; coin but accept correct ones even if they are dirty or somewhat worn. But if such a check is built into a vending machine, blanks will definitely not work. <img src="styles/default/xenforo/clear.png" class="mceSmilieSprite mceSmilie1" alt=":)" unselectable="on" unselectable="on" /></p><p><br /></p><p>Christian[/QUOTE]</p><p><br /></p>

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