That sounds like more work, errr, FUN than was needed. ;) I wanted to build one of those in the 90’s but the LEDs alone cost $500.
-g On Sun, Jun 28, 2020 at 10:41 AM Kevin McClaning via TriEmbed < [email protected]> wrote: > 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 > > > > > > > > > > > > > _______________________________________________ > Triangle, NC Embedded Computing mailing list > > To post message: [email protected] > List info: http://mail.triembed.org/mailman/listinfo/triembed_triembed.org > TriEmbed web site: http://TriEmbed.org > To unsubscribe, click link and send a blank message: mailto: > [email protected]?subject=unsubscribe > > -- Gregg Tracton: tired, retired & inappropriately unattired (PJ's)
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