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Wearwulf

A Wearable Computer For Under £100?

Wearwulf is intended to return to my original goal, a cheap entry into the world of wearable computing. Vidi, now abandoned, was intended to be a USB wearable computer display, and the basis of a cheap wearable computer, but it has too many parts, and it's far too expensive.

Wearwulf is a complete wearable computer:

• Processor: Philips LPC2106 processor.
• Display: Kopin 320M Cyberdisplay.
• Communications: RS232 port.
• Mass Storage: MMC Card.

To conserve power, Werewulf will be instantly available, but not always on. It is intended to provide the core functionality of a wearable computer, but without the bells and whistles that seem to have become deriguerre amongst some in the wearbles community.

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Philips LPC2106 processor

The Philips LPC2106 is an ARM based microcontroller, packing a powerful punch into a tiny 48-pin package:

• 64KB RAM
• 128KB FLASH
• SPI interface
• Asychronous serial interface
• Upto 32 general purpose input/output pins.

There are two other processors in the family, the LPC2104 and LPC2105 which have 16, and 32KB of memory respectively - in all other aspects the chips are identical.

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Kopin 320M Cyberdisplay

The Kopin 320M is a small monochrome display perfect for use in a wearable computer. While the display can display up to 256 grey levels only a 1-bit colour depth will be used, thus reducing our memory requirements. A single frame of data will fit into 9600 bytes of memory.

The Kopin 320M uses a proprietary interface, and will be connected to the LPC2106 by a CoolRunner II CPLD. The LPC2106's PWM/match outputs will be used to generate some of the signals, simplifying the logic and allowing a smaller CPLD to be used.

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Serial RS232 Port

The serial communication port opens up a number of possibilities:

• Data synchronisation with a PC.
• Connecting serial mice for input.
• Using the Wearwulf as an intelligent display for a PC.

This last possibility ensures the longevity of the project - even if I outgrow the Wearwulf's capabilities, the display will still be useful. The Wearwulf is powerful enough to support a display programming language, allowing complex graphics to be created from short commands sent over the serial port.

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MMC Mass Storage Card

MMC cards are small, readily available, and most importantly capable of being accessed using a simple SPI serial interface. A mass storage device allows the limited FLASH memory of the Philips LPC2106 to be circumvented, allowing the storage of relatively large quantities of data.

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