A technique is disclosed that communicates to a user detailed diagnostic
information about a failure in an electronic device in a detailed and convenient manner
using simple hardware. A light-emitting or sound-emitting component of the device
encodes characters of a textual description of the failure. A smartphone app captures and
decodes the description, and presents a corresponding textual message about the failure
on the smartphone display.
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INC, HP, "DIAGNOSING LOW-LEVEL FAILURE INFORMATION IN ELECTRONIC DEVICES", Technical Disclosure Commons, (October 03, 2018)