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I would like to design a circuit which when moves should give out a voltage. So I would like to choose an accelerometer for this application. I wish to go for single-axis accelerometer which is quite good enough for my application. I need to understand what are all the parameters that we need to understand before going for the selection.

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    \$\begingroup\$ What causes the circuit to move and how fast does it move? When it is moving at constant speed an accelerometer will give no signal any more. \$\endgroup\$ – Andy aka Aug 10 '13 at 14:44
  • \$\begingroup\$ May i know the reason for devoting the question? \$\endgroup\$ – Durgaprasad Aug 10 '13 at 14:46
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    \$\begingroup\$ start by reading a datasheet, then ask about the parameters you don't understand. As it is, this question reduces to "please tell me everything about accelerometers". \$\endgroup\$ – Phil Frost Aug 10 '13 at 14:48
  • \$\begingroup\$ @Andy: I will be placing the device in an object which moves at different speeds in a single direction in fact in a horizontal direction. \$\endgroup\$ – Durgaprasad Aug 10 '13 at 14:48
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    \$\begingroup\$ Then what causes the "object" to move and how would an accelerometer give a signal out when velocity is constant? If you want answers, please don't ask why I'm asking a question; make the assumption I'm trying to help you and not trying to steal your ideas. \$\endgroup\$ – Andy aka Aug 10 '13 at 14:53
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Like most sensors, accelerometers are subject to offset and range errors as well as noise. Each of these parameters usually has a temperature dependence, too.

In addition, since you need to mathematically integrate acceleration to get velocity, there are additional considerations. A constant error in acceleration (because of offset or scale errors) results in a velocity value that drifts indefinitely with time. And the noise in acceleration results in a "random walk" of the velocity value that also grows with time.

There are various ways to deal with these real-world considerations, but it's too broad a topic to get into without knowing more about your specific application.

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