Simultaneous RFID Tag Reader Hookup Guide

Contributors: Nate
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Example 5 - Write User Data

The User memory area is a fun place to play. A given UHF tag can have 0 to 64 bytes of editable User memory. Example 5 shows how to edit the User Data.

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char testData[] = "ACBD"; //Must be even number of bytes. "Hello" is recorded as "Hell".
byte responseType = nano.writeUserData(testData, sizeof(testData) - 1); //The -1 shaves off the \0 found at the end of string

Give .writeUserData() an array of characters and it will be recorded to the first tag detected. A few bytes of editable memory may not sound like a lot be remember these are passive tags - no batteries required! You can query a tag for the user’s dietary restrictions. Or you could adjust the lighting depending on who walked in the room. Or you could set the time at which a medication must be taken. Perhaps a prosthetic leg goes into a more aggressive mode when basketball shorts are worn. The applications get far reaching.