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RFID for Dairy Shop

 
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Hi actually i want to develop an application for Milk shop which will

1.Use RFID to mark delivery of milk to customer. Each customer will be provided by tags and workers with RFID readers. when workers come back to shop after delivery i want to fetch delivery data in my program and store milk delivery detail in my application like who took how much milk today and who didn't n all.
2.Want to fetch all milk data analysed by Ekomilk Ultra Milk analyzer,milkana98-2a which has RS 232 port
Can java communicate to this machine which we use for analyzing milk ? I want to fetch all data from this machine to my program and save all records so eliminates manual writing stuff.
3.How much a RFID scanner will cost ? and how much for a tag ?

Please help me what i need to study?
 
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The MakerShed catalog has a reader and several RFID tags in various forms for about $65. The output of the reader is good-old TTL serial so you would need an adapter to talk to a computer USB port.

Having the reader talk to an Arduino micro-controller is a cool option.

These RFID tags are "passive" so your sensor needs to be fairly close to the tag. Active tags that work at a distance are a lot more expensive.

Bill

 
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This is an old post, but since it's been re-awakened, I'd like to add to it. The hardware options for RFID are about the same now as back then. One thing that wasn't mentioned, however, is that there are several different radio frequencies that RFID operates on. They stretch all the way from VLF radio (125 kHz) to microwaves. So you would want to make sure that your tags and readers are compatible.

The other item you should consider is range. Some RFID is extremely short range, other RFID is capable of reading a meter or more from tag to sensor.

And finally, some RFID is passive - such as the little "postage stamp" thingies you often find in product packaging, and some is active - where the tag has its own power supply and transmitter. Those are typically for longer-range use.

While technically not literal RFID, the Applie iBeacon for Bluetooth also acts like an active RFID "tag".
 
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