The main element of the digital pencil-case is Arduino Duemilanove (Atmega328) supported by the display hd44780 20x4, RTC clock DS1307 (with dedicated battery) adn temperature sensor MCP9700. Digital pencil-case is powered by 6 AA batteries, which give in total 9V. 3 buttons are used for navigation (+, -, OK). There is also a switch (information sheet lock).
Functions:
display date and time
set date and time
thermometer
store the highest and lowest temperatures
battery monitor
„information sheet” mode: 80 lines x 20 characters each = 1600 characters – activated by a button or closing a pencil with a magnet, the information is defined in the program code
lock mode
scrolling by two buttons
And this is the pencil with magnet. When you close it to approximately 3cm, it shorts the reed contacts which in turn results in displaying the information. After moving the magnet, saved text disappears and start screen is displayed.
I don't promote cheating, but THIS is a nice idea!!!!
You could have two reed switches and use the pencil to 'swing' to the next page or going 'back' without the need to touch the buttons...
less suspicious...
( ¬¬)