Excellent write up, Huan.
Speaking of "silly" and "No one cares about," I once bought a scrolling
LED sign at
a ham fest but couldn't find documentation. I reverse-engineered the
hardware so
I could directly access the LED matrix with an Arduino, then set it
about displaying
humorous/motivational messages (of the kind you see at the bottom of
slashdot),
along with some random numbers and graphics.
No, it doesn't stop there. I used the Arduino random number generator to
select the individual
messages to display but, I noticed that it always produced the same
"random" order of messages.
This annoyed me, so I added a temperature sensor and used its output to
increase the entropy
of the Arduino. Since I was in the "increase the entropy" neighborhood,
I build two audio oscillators,
with crappy stability and ran them into the AD converters of the
Arduino. I sampled the waveforms
every now and then and fed that into the Arduino's random seed as well.
Yeah, "silly" but it was a fun diversion. Did all this in the
before-the-pandemic timeframe.
Kevin
On 6/24/20 12:43 PM, Huan Truong via TriEmbed wrote:
This has taken me way more time than I thought, but finishing this
retrofit is a big achievement for me. It's really silly and serves
exactly no purpose other than RE'ing something no one cares about. So
I just want to share for some shits and giggles.
http://www.tnhh.net/posts/adventures-hacking-fake-vivitar-vintage-radio.html
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