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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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closed as too broad by Phil Frost, PeterJ, Leon Heller, Matt Young, placeholder Aug 10 '13 at 17:42

Please edit the question to limit it to a specific problem with enough detail to identify an adequate answer. Avoid asking multiple distinct questions at once. See the How to Ask page for help clarifying this question. If this question can be reworded to fit the rules in the help center, please edit the question.

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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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