i have been reading this thread, and quite interest to build one, but the link you posted has been broken, can you post the proximity.asm again?
Linkworks but may-be there are problems in some servers. Anyway here it is attached.
I can't give hex file, this is not a complete project but only fragment of a larger one.
About reading distance: i have used cables (CAT5) up to 20 meters without problems.
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