Would you really need to cheat when you are able to set this thing up?
Interesting EngineeringBy Derya Ozdemir
© Neutrino/GitHub | This Calculator Hack Turns a Boring Casio Into the Stealthiest Cheating Device Ever

There are a number of people out there who've gone beyond peeking with the corner of their eye to developing new devices in the name of cheating, and it is up for debate whether that's immoral or impressive. Probably, there is a mix of both in there.
In such a case, YouTuber Neutrino upgraded his Casio calculator to a smart gadget that has a secret screen, Wi-Fi, and even a messaging functionality. It might look like a normal one; however, don't judge a book by its cover since this one is a very complicated stealthy cheating device that has the appearance of a boring Casio calculator.
Scientific calculators have their limitations; however, this one with a secret OLED screen,  Wi-Fi, and a chat function beg to differ. 
This isn't any ordinary calculator, and if you needed proof, this Casio fx-991MS' normal-looking solar cell as it turned off is actually is a tiny OLED display. It doesn't stop there, and Neutrino takes the hack several steps further by adding an ESP8266 Wi-Fi module and a rechargeable battery, all the while without modifying the Casio's exterior itself.
The internet connection, while limited, allows it to access text files stored on Google Firebase, and the gadget is activated through a reed switch and handheld magnet. The "button" interface is achieved through magnetic taps and double-taps on a pair of Hall effect sensors. 
Moreover, you can actually send text messages, but as you'd imagine, the options are quite limited.
This article was originally published by Interesting Engineering. 
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