CHEAP, single-axis accelerometers?

D

David Harper

Guest
Does anyone know any good *cheap*, single-axis accelerometers with a
range of about +/- 10 g's (error on the order of +/- 1%)? I'm hoping
to incorporate this with a microcontroller. Measurement intervals
would be no faster than 100/s (probably more like 20/s). This is not
for vibration measurement, but rather acceleration.

Any suggestions or experience to offer?

Thanks in advance!
Dave
 
David Harper wrote:
Does anyone know any good *cheap*, single-axis accelerometers with a
range of about +/- 10 g's (error on the order of +/- 1%)? I'm hoping
to incorporate this with a microcontroller. Measurement intervals
would be no faster than 100/s (probably more like 20/s). This is not
for vibration measurement, but rather acceleration.

Any suggestions or experience to offer?

Thanks in advance!
Dave
Click to expand...
Have you looked at the Analog Devices MEMS units? I don't know off hand
if they're good to 1%, but they're certainly cheap and good for 10g's.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
David Harper wrote:

Does anyone know any good *cheap*, single-axis accelerometers with a
range of about +/- 10 g's (error on the order of +/- 1%)? I'm hoping
to incorporate this with a microcontroller. Measurement intervals
would be no faster than 100/s (probably more like 20/s). This is not
for vibration measurement, but rather acceleration.

Any suggestions or experience to offer?

Thanks in advance!
Dave
Click to expand...
'Cheap' is Analog Devices or MEMSIC. MEMSIC are cheaper than AD, but
have lower bandwidth. 20 samples a second isn't enough for accurate
acceleration, ie standing quarters etc. You'll need 50 - 100, and I'd
use a dual axis, if only to allow calculations to take body angle of the
vehicle into account.

Al
 
Does anyone know any good *cheap*, single-axis accelerometers with a
range of about +/- 10 g's (error on the order of +/- 1%)? I'm hoping
to incorporate this with a microcontroller. Measurement intervals
would be no faster than 100/s (probably more like 20/s). This is not
for vibration measurement, but rather acceleration.
Click to expand...
What do you mean by "cheap"? When I think cheap, I think of high volume.

One possibly intersting source would be parts intended to trigger
air bags in cars.

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Hal Murray wrote:

Does anyone know any good *cheap*, single-axis accelerometers with a
range of about +/- 10 g's (error on the order of +/- 1%)? I'm hoping
to incorporate this with a microcontroller. Measurement intervals
would be no faster than 100/s (probably more like 20/s). This is not
for vibration measurement, but rather acceleration.


What do you mean by "cheap"? When I think cheap, I think of high volume.

One possibly intersting source would be parts intended to trigger
air bags in cars.
Click to expand...
That's what the silicon MEMS parts from Analog Devices and others are
for. There are quartz MEMS devices that are better (look for
BEI/Systron Donner), and if you want a _real_ accelerometer get a
force-balanced type like they use in inertial nav systems.

--

Tim Wescott
Wescott Design Services
http://www.wescottdesign.com
 
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