![]() ![]() ![]() Placing a magnet - possibly hidden in a pen cap - near the reed switch will turn the display on, and placing another magnet near the Hall-effect sensors will navigate through the display’s interface, supporting two inputs with long, short, and multi-tap gestures each. To achieve the latter, added two Hall effect sensors and a reed switch inside each end of the calculator. For now, the original video is available via the Internet Archive. The video linked above and embedded below are unavailable due to these claims, despite widespread belief that this project does not violate copyright. (Video, embedded below.)Įditor’s Update: Please read our follow-up coverage to the copyright claims made against this project. ![]() But since the display won’t do much on its own, he decided to connect it to an ESP8266 and mount it all inside the calculator’s housing, turning it into a spy-worthy, internet-connected cheating device, including a stealthy user interface controlled by magnets instead of physical buttons. For, it was an old Casio calculator that happened to have a perfectly sized solar panel to fit a 128×32 OLED as replacement. Obviously, we would never endorse cheating on an exam, but sometimes a device is just too tempting to be left untouched. ![]()
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