Accelerometer users, please chime in

General support questions and announcements for MS3. See also MS3 manuals.

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93supercoupe
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Accelerometer users, please chime in

Post by 93supercoupe »

Im looking to add a single or dual axis accelerometer in my drag application and wanted to know how other people are making out with using this feature.

Im looking at this unit
https://www.dimensionengineering.com/products/de-accm6g

The manuals say that it reads +/-1g, which is a little confusing. Not sure if that means it will only read in 1g increments

So please chime in with your experience, Accelerometers that your using, things new Accelerometer users should look for or know about, ect.

Thanks
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jsmcortina
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Re: Accelerometer users, please chime in

Post by jsmcortina »

It means it can read up to +1g and down to -1g. Not enough.

James
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racingmini_mtl
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Re: Accelerometer users, please chime in

Post by racingmini_mtl »

The link shows it as a +/-6g sensor. The confusion might come from images showing the sensor reading +/-1g depending on orientation; this is the sensor simply reading earth's gravity.

That seems to be an acceptable unit if somewhat a bit pricey.

Jean
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93supercoupe
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Re: Accelerometer users, please chime in

Post by 93supercoupe »

I was referring to the MS manuals. Sorry.

I bought the 2g sensor, basically on a guess and some reading about bikes barely pulling 1g
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93supercoupe
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Re: Accelerometer users, please chime in

Post by 93supercoupe »

BootlegTuned
racingmini_mtl
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Re: Accelerometer users, please chime in

Post by racingmini_mtl »

A triple-axis is a better choice, in my opinion, because you will almost certainly not have a perfectly aligned board. Even if you do manage to have it perfectly horizontal and aligned in a static situation, as soon as you start moving that will be gone. With 3-axis, you can do some computations to get the actual acceleration because you know that gravity won't change (unless you jump in which case you could see 0g in the z-axis).

And the manual only refers to calibration which is done using gravity and moving the sensor so that each axis is exactly vertical (up and down) giving you a +/-1g reference.

Jean
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93supercoupe
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Re: Accelerometer users, please chime in

Post by 93supercoupe »

Good input. I was kind of hoping that's what the 2 axis would do for me. But it's 22$, so I won't be too upset if it doesn't work well

Does 2g seem like enough for a 3600lb car on a 26inch slick around 1000whp? I read that some pro mods see about 3 and are cutting sub 1.0 60fts

I'd be estatic if I could get a 1.3, but prolly be around 1.5
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Re: Accelerometer users, please chime in

Post by whittlebeast »

I use accelerometers all the time with my Squirts. 2 gees will handle most cars well into the 8s. I use a 3.5 v voltage regulator and a 3 axis piece designed for the Arduino world. About $10-15 for everything. This is an 8.5 sec car.

http://www.nbs-stl.com/racecardata/RichFullPassLean.jpg

Andy
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Re: Accelerometer users, please chime in

Post by jsmcortina »

On a 1.8 60ft my accelerometer recorded a peak of 11.7 ms-1 i.e. 1.2g.

James
I can repair or upgrade Megasquirts in UK. http://www.jamesmurrayengineering.co.uk

My Success story: http://www.msextra.com/forums/viewtopic ... 04&t=34277
MSEXTRA documentation at: http://www.msextra.com/doc/index.html
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whittlebeast
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Re: Accelerometer users, please chime in

Post by whittlebeast »

Here is a 165 MPH motorcycle I tossed a logger on one day.

http://www.nbs-stl.com/racecardata/DaveLarsonGeez.pdf

Andy
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Re: Accelerometer users, please chime in

Post by whittlebeast »

Keep in mind, .911 geez works out to 20 MPH per sec
93supercoupe
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Re: Accelerometer users, please chime in

Post by 93supercoupe »

Good info guys. Hopefully i max this sensor out then!!
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suberimakuri
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Re: Accelerometer users, please chime in

Post by suberimakuri »

Interesting. I bought the 3 axis 3D accelerometer from Dimension and am putting it on a TinyIOx. I didn't want the mounting hassles of a 2 axis, but I imagine it could be made to work for those inclined. :)
brianj5600
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Re: Accelerometer users, please chime in

Post by brianj5600 »

whittlebeast wrote:I use accelerometers all the time with my Squirts. 2 gees will handle most cars well into the 8s. I use a 3.5 v voltage regulator and a 3 axis piece designed for the Arduino world. About $10-15 for everything. This is an 8.5 sec car.

http://www.nbs-stl.com/racecardata/RichFullPassLean.jpg

Andy
What does your car 60'?
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