A method of making an electronic storage system includes receiving a substrate with a detection region. A transceiver formed on a transceiver substrate separate from the substrate is affixed to the substrate. A code circuit separate from the transceiver is disposed over the substrate. The code circuit includes a conductor disposed over the substrate at least partly in the detection region. The conductor has an electrical state that changes in response to an environmental factor. The transceiver is electrically connected to the code circuit so that the transceiver can detect the electrical state of the conductor. The transceiver includes an interface adapted to selectively transmit an uplink signal representing the electrical state of the conductor.