A few weeks ago on a facebook group dealing with electronics appeared a post by a person, Giuliano Fois, reporting the formation of needle-like tin crystals during a chemical tinning process of an electronic board, forming conductive bridges between the tracks. I offered to try to take some micrographs of the crystals using my school’s … Leggi tutto “Chemical tinning of PCBs: some analysis”
Autore: Valerio Nappi
Banana random number generator part 2: chi-squared, ent, timers, interrupts
Read the first part here. In the previous post we addressed the basic concepts of the generator, leaving open the question of the bad chi-square. Before delving into the reasons for the bad result, it is necessary to understand what this value is and how randomness is “extracted” from a radiation event. Let’s start by … Leggi tutto “Banana random number generator part 2: chi-squared, ent, timers, interrupts”
Generating true random numbers from bananas
It was a dreary afternoon in Milan last year when, procrastinating on studying, I was struck by a flash of genius. “What would happen if I made a banana-powered random number generator?“. I immediately went to tell my roommate, who was also an electronic engineer.He looked me in the face and burst out laughing. At … Leggi tutto “Generating true random numbers from bananas”