CMA ML29s User guide

3‐AXISACCELERATIONSENSORML29S

USER’SGUIDE

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CENTRE FOR MICROCOMPUTER APPLICATIONS

http://www.cma-science.nl

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2|ML29s3‐AxisAccelerationSensorUser’sGuide

Shortdescription

The3‐AxisAccelerationsensorML29smeasuresaccelerationalong3axesx,y,andz.

Thesensorhas3me asurementranges:‐2..2g(default),‐4..4g,and‐8..8g.The

sensorgivesvaluesonagscale,wherebyonegistheaccelerationdueto

gravityat

theEarth’ssurface,9.81m/s

Thesensingelementofthesensorismountedinsidetheairbox.

The directions of the axes are marked on the sensor’s

label. Holding the sensor in the position shown on the

pictureshould give the following  values of the measured

componentaccelerations:

x‐component=0g

y‐component=

0g

z‐component=‐1g

The net acceleration is calculated as the square root of

thesumofthesquaresofthecomponentaccelerations.

The 3‐Axis Acceleration sensor is an I2C digital sensor,

which gives calibrated values of the measured quantity. This sensor can only be

connectedto

specialinterfacesthatsupportI2CdigitalsensorsliketheCMAMoLab

interface. The sensor cable needed to connect the sensor to an interface is not

suppliedwiththesensor(sensorcablesaresuppliedwithinterfaces).

Sensorspecifications

The3‐AxisAccelerationsensorML29s isadigitalsensorthatconvertsthemeasured

acceleration values to digital values via 10‐bit analog‐to‐digital conversion. The

resolutionofthesenoris±0.004gfortherangebetween‐2to2g,±0.008gforthe

rangebetween‐4

to4gand±0.016gfortherangebetween‐8to8g.

Collectingdata

This3‐AxisAccelerationsensorworksonlywithspecificinterfaces.Thesensorwillbe

automatically detected when connec ted to such an interface. For detailed

information about measurements with sensors consult the User  Manuals of the

interfaceandtheCoach6software.

Calibration

The3‐AxisAccelerationsensorissuppliedwithafactorycalibrationingvalues.The

Coach6programallowsselectingthemeasuringrangeofthesensorandshiftingthe

sensorcalibrationifneeded.TheSettozerooptioninCoach6canbeusedtoadjust

thezeropointandthe

Settovalueoptioncanbeusedtoadjustthemeasuredvalue

toanothervalue.Thiscanbedoneindependentforeachof3axes.

ML29s3‐AxisAccelerationSensorUser’sGuide |3

Since the 3‐Axis Accelerometer is equivalent to three accelerometers, you can use

just one channel of it to study acceleration along a single axis. Mount the

accelerometersothataparticularaxisisinthedirectionofinterestandmonitorjust

thatchannel.

Suggestedexperiments

The3‐AxisAccelerationsensorcanbeusedtostudy,e.g.:

 Bungeejump.

 Pendulummotion.

 Changesinacceleration ina golfswing.

 Explanationoffreefall,

 Tiltingofanobject.

Also the sensor can be used in any experiment that uses only one or two axes,

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examplesinclude:

 Measuretheaccelerationofdynamicscartsastheyrolldowninclines.

 Measuretheaccelerationofdynamicscartsasaforceisappliedtothem.

 Measureaccelerationofelevators,remote‐controlledcars,bicycles, or

automobiles.

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Figure 1. Measuring the acceleration of a dynamic cart as a force is applied.

WhenusedincombinationwithaForcesensoritispossibletomonitorbothforceand

accelerationatthesametime.

4|ML29s3‐AxisAccelerationSensorUser’sGuide

TechnicalSpecifications

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Sensorkind

Digital

on‐sensordigitalconversion

(upto10‐bitsresolution,communicationviaI2C)

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Measuringrange

‐2to2g(default)

‐4to4g

‐8to8g

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Resolution

±0.004g(range‐ 2to2g)

±0.008g(range‐4to4g)

±0.016g(range‐8to8g)

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Accuracy

Typical,±0.35 g(samplingrate< 25Hz)

Zero‐gOffset:±0.06gat25°C(samplingrate<500Hz)

Nonlinearity:±0.5%offullrange(±8g)(samplingrate<25Hz)

Cross Axis Sensitivity: 2% (Relative contribution between 3

axes)

Maximal

samplingrate



500Hz

Response

Acceleration data refresh rate (all axes) of sensing ele m ent:

3000Hz

Dimensions Housing:37x18x16mm(WxDxH)

Connection 5‐pinsminijackplug

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Warranty:

The 3‐Axis Acceleration sensor ML29s is warranted to be free from defects in

materials and workmanship for a period of 12 months from the date of purchase

provided that it has been used under normal laboratory conditions. This warranty

doesnotapplyifthesensorhasbeendamagedbyaccident

ormisuse.

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Note: Thisproductistobeusedforeducationalpurposesonly.Itisnotappropriate

forindustrial,medical,research,orcommercialapplications.   

Rev. 17/11/2011

CMA ML29s User guide

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