[quote:aa370ed0dc="atmega64"]
I have to write and read a 5-digit number on a support to be given to various people ...
[/quote:aa370ed0dc]
What about a dallas (maxim) 1wire button?
It's robust, easy to implant and cheap.
[img:aa370ed0dc]https://upload.wikimedia.org/wikipedia/commons/thumb/5/56/I-button.jpg/350px-I-button.jpg[/img:aa370ed0dc]
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