aki009 on Efficient X86_64 Emulation With Box86.mt23 on AI And Savvy Marketing Create Dubious Moon Photos.Jenny List on 27 Litres And 12 Cylinders, With A Practical Station Wagon Body.New Raspberry Pi Camera With Global Shutter 35 Comments He wraps up the hack with a battery and solar charging circuit as well to make a completed project.Ĭontinue reading “Shift Register Powered Realistic Candle Flicker” → Posted in Misc Hacks Tagged candle flicker, candles, linear feedback shift register, random number, shift registers You can see the results in the video after the break where describes the circuit. It’s commonly used as a poor-man’s random number generator, although it’s not technically truly random, statistically it does a very good job.
If you want to learn more about this, the technique it’s called a “ linear feedback shift register“. The randomness of the output is created is by feeding back the outputs of the shift registers to an XOR gate. The basics of his hack uses two shift registers tied together that are fed a single clock signal, and also a latch signal that is slightly delayed version of the same signal made by a RC-time circuit. Now’s the time where some of us lazy hackers might grab a microcontroller, and copy and paste in some pseudo-random number generating code you found on the Internet, but not. And like any hacker might, his mind started to devise a better way. And in the true spirit of a hacker, he started to notice the patterns programmed into the fake flame repeat over and over again. recently went out to dinner at a restaurant that was using some cheap LED candles (yuck) instead of the real thing. Video after the break.Ĭontinue reading “A Relay-Based Pseudorandom Number Generator” → Posted in Holiday Hacks Tagged blinky, christmas ornament, linear feedback shift register The project also serves as a great way to learn about shift registers and basic relay logic, though the latter is rarely used these days for serious purposes. The result is a cute Christmas ornament that blinks in a deterministic fashion, and has a great old-school look due to the exposed copper of the PCB and the retro LED colors used. built the shift register using relays, which create a lovely clacking sound as the register operates, and LEDs, which glow depending on the values in the register. Thus, the numbers generated are pseudorandom, not truly random, and depend on the initial seed value of the system. The LFSR generates a stream of numbers, with each number dependent on the previous state of the register. The build relies on a 16-bit linear feedback shift register, or LFSR. built a Christmas decoration that does the latter, displaying the results on an attractive flashing ornament. There are a great variety of ways to build a random number generator, and similarly many ways to generate numbers that appear random, but in a pure mathematical sense generally aren’t.
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