Many public buildings and elevators in Hong Kong installed wireless controls, simply wave your hand in front of a little hole (ultrasonic sensor?) next to the floor button you want to go to. Curious to find out in which mall they installed this in!
How I got into it was tiredness of centralised platforms that dictate how we use those platforms. Often archival, search functions are non-trivial in things like Whatsapp, Discord etc. We made our own mesh application based on wifi and batman but ofc we couldnt convince our friends and family to switch over.
The ubiquity (network effect) and ‘convenience’ of other apps. This was more than a decade ago and our devices were an extra thing you needed to carry (travel router).
These stopped working since 2G, since it uses radically less power. Altho I did recall seeing some fancy phone cases with blinkies on 3G… never could replicate it sadly. I guess with a lot of joule thief/stepup circuits it might work…
I never give up. Tried soo many different diodes, but the ‘good’ ones seem very susceptible to clones/fakes since they arent manufactured anymore. There is a company that makes dedicated IC’s that can harvest the emf very efficiently, bit expensive though… and a black box..
And Raven Kwok: https://ravenkwok.com/big-brothers-are-watching-you/
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