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2) Design Problem and System Requirements
2.1 Design Problem
The goal of this project is to design a low cost, compact and reliable acceleration
measuring device. It should also be expandable into multiple clients system with few
code modifications. A simple graphical interpretation should be available to analysis the
collected data.
The system is composed with two major hardware and they are remote end’s
hardware and base station’s hardware. Remote end’s hardware is responsible in
collecting analog signals from accelerometers, converting signals into digital count by
built-in ADC, arranging data into packet, and sending the packet to the base station’s
hardware. Base station’s hardware is responsible in receiving packet, rearranging the
received data in percentage, and transmitting the rearranged data to a computer via
USART. Finally, data is analyzed in some graphs.
2.2 System Requirements
A simple-to-use and maintenance free system is the priority of this design. A
nearly plug-and-play system is designed with minimum user’s operational steps. After
discussing with Dr. Land, system requirements are as following:
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For a given tight budget, cost needs to be kept low.
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The device should be fairly compact since it would be carried on a human’s body.
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Range of the radio frequency connection should be highly stable up 20m.
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The system should be expandable with multiple clients if necessary.
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Acceleration readings should be constantly updated at 10Hz.
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A graphical interpretation should be available on the received readings.
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No radio interference is allowed on other instruments.
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