User manual

ECE 477 Final Report Spring 2004
3.0 Constraint Analysis and Component Selection
This design of a Wireless Ordering Device (WOrD) will allow a customer to view limited
menus and possibly other information at a commercial establishment (e.g. a restaurant or bar). A
transmitter connected to a host computer will serve as a base station transmitting menus and
other information. A remote device will act as a user interface receiving the transmitted
information and transmitting orders to the base station. This remote device’s interface will
include an LCD display and menu navigation buttons. The focus will be on developing a small,
user friendly portable device that is also cost efficient. The handheld unit must have low power
consumption and also be able to send and receive data from anywhere within the immediate
vicinity of the establishment.
Analysis of Design Constraints
Computational Requirements:
Most parts of the handheld unit are fairly small and are not computationally intensive.
Data transfer will be transmitted relatively slowly. The menu interface on the device does not
need to be particularly fast, and will be handled mainly by the display adapter. The bulk of the
computational requirement will be on the base station which will be able to edit the menu
selections that are on the device.
Interface Requirements:
The main interfacing with our design is mainly a graphical LCD display and the RF
transmitter/receiver units. Along with this, we will also have multiple push buttons for
selections made on the device and LED’s which will light up when signaled.
While Bluetooth or 802.11 is an option for communication they are deemed too costly in
terms of development and integration. A serial transceiver provides the basic functionality
needed with much less overhead and is actually more commonly used for similar devices. This
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