One word to the costs.

arduino uno: 16.10€ (bought in China)
Ethernet-shield Wiznet5100: 22,50€  (bought in China)
RFID-Shield Adafruit 789: 44.83 € (bought from watterott electronic in
Germany)

That is 83.43 € incl VAT an PP.

Now one word to the RFID-cards. I ask a lokal retailer if he had some
cards, that he could not use anymore for a good price. I told him  I
need them for testing. Fortunately he had some - round about 400 pcs.
But there was the problem with the price. I must say I am retired (age
65) and have more time than money. :-) So I offered him to work three
days for him - he agreed. Lucky me! Most of the cards come from china
and the quality is not constant as good as it should be. Sometimes the
thickness of the cards is too much, so they cannot be printed in
automatic printers. That are the cards we wanted! Ask your lokal
retailer - good luck.

For new cards the regular price would be about 50-60 eurocent/card if
you order 100 plus.  

I think it would be great for listen CD and internet Radio for
handicapped people and little children. You can place the reader card
under the caseboard or the tableplate. The range of the shield it nearly
10 centmeters. 

You are right, there was a project similar to mine. I tried to get the
documetation, but was not successful. Therefore I decided to realise it
by myself. I hope there is  time enough for making a small clip on
youtube this week.

musicmaster


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