Project description:
One of the newest and fastest growing additions to the digital age in the 1990s has been the handheld personal computer. Given a little flash memory and a good LCD, anything is possible and commercial products like the 3Com PalmPilotâ and IBM Workpadâ are flourishing. But as these products expand their functionality so does their price. Last year, a more downscaled device Frankin Rexâ card sold very well because it offered a small portable data unit at a minimal cost. In fact, it only served as a data display device for the data that was transferred from the PC, and it functions using just a few buttons rather than using a more expensive LCD that can accept input using a pen-like device which is detected when pushed on the screen. This year they have improved the card in the Rex Proâ version to take input using additional buttons to scroll through alphanumeric characters. In this project we attempted to produce a similarly functioning device using an Atmel AT90S8535 microcontroller, its Atmel evaluation board, and an Optrex 4×20 LCD. In addition, we also attempted to include an infrared communication interface on the prototypes which is used for downloading/uploading data to the PC, as well as for messaging between two devices, which is only a recent addition to the high-end handhelds like the 3Com Palm III. This IR message transfer ability has been especially appreciated by users who enjoy not having to physically connect the devices to their PC hardware (in a PCMCIA slot for example), and corporate users have found it useful as a way to silently communicate across a room or even just across the table at a boring meeting.
Link: CU Organizer, AT90S8535
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