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From: Paul Rubin <no.email@nospam.invalid>
Newsgroups: comp.arch.embedded
Subject: Re: Numerical output from a single LED
Date: Fri, 27 Dec 2019 11:13:49 -0800
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Robert Roland <fake@ddress.no> writes:
> Transmit as serial data. Sell them a device that they can hold up to
> the LED to read the data and display the number.

A phone app could also do that, if the baud rate was slow enough for the
phone camera to keep up.

This type of late requirement change indicates a flaky customer but I
guess that is par for the course.