PASCO CI-6742A User Manual

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Quick Start

Included Equipment Part Number

Motion Sensor II CI-6742A

Additional Equipment Required

ScienceWorkshop-compatible

Interface

UI-5000, CI-7650,

CI-6400, or similar

Yellow Plug

(left)

Black Plug

(right)

Range
Switch

Ultrasonic

Transducer

Rotating

Head

Clips for

mounting

on track

Hole for

mounting

on rod

Target

Indicator

Motion Sensor II

Motion Sensor II

CI-6742A

CI-6742A

Theory of operation and specifications are listed at the end of the
instruction sheet.

Note: Essential PASCO Capstone tasks are described briefly in this
instruction sheet. For more instructions on using Capstone, see the User’s
Guide or the online help

.

Instruction Sheet

012-09624B

1. Connect the Motion Sensor II to your ScienceWork-

shop-compatible interface (such as the 850 Universal Inter-
face or ScienceWorkshop 750 USB Interface).

2. If you are using a computer, connect the PASCO interface to

it, turn the interface on, and start the data acquisition soft­ware (such as PASCO Capstone).

3. Place an object in front of the sensor at least 15 cm away.

4. Click “Record” or press “Start” to begin recording data.

5. Move the object in a straight line directly away from or

toward the sensor.

Introduction

The Motion Sensor II works with a ScienceWorkshop-compatible
interface and PASCO data acquisition software (such as PASCO
Capstone) to measure and record motion data. It produces a series
of ultrasonic pulses and detects the sound reflecting back from an
object in front of it. The interface measures the times between
outgoing pulses and returning echoes. From these measurements,
the data acquisition software determines the position, velocity,
and acceleration of the object.

This instruction sheet includes procedures for setting up the hard­ware and software, collecting data, changing the sample rate,
mounting the sensor on equipment, and troubleshooting.

800-772-8700 www.pasco.com

®

Motion Sensor II CI-6742A

Yellow Plug

Black Plug

DIGITAL

INPUT

Click “Add

Sensor/Instrument”

Hardware

Setup

icon

Motion Sensor Icon

850 Interface Icon

1) Press
“Motion

Sensor”

2) Press
“OK”

Set-up

To Connect to a PASCO Interface

Connect the Motion Sensor's yellow plug to DIGITAL INPUT 1
(or Digital Channel 1) of your ScienceWorkshop-compatible
interface. Connect the black plug to DIGITAL INPUT 2 (or Digi­tal Channel 2).

NOTE: If you are using a PASPORT-only interface (such as the
SPARK Science Learning System), use a PS-2159 Digital
Adapter to connect the Motion Sensor to the interface. Put the
yellow plug into Input Port 1, and the black plug into Input Port

2. Plug the Digital Adapter into a port on the PASPORT-only
interface.

PASCO Capstone Setup

6. Confirm that the “Hardware Setup” panel shows the icon of

the Motion Sensor and the icon of the interface.

7. Double-click the Graph icon in the Displays palette (or

other display icon) to create a data display.

8. In a Graph display, click the “Select Measurement” menu

button on the vertical axis and select position, velocity, or
acceleration. Click “OK”.

SPARK Science Learning System (SLS) Setup

1. Turn on the interface. Connect the Motion Sensor’s plugs to

the input ports on a PS-2159 Digital Adapter, and plug the
adapter into the interface.

1. Turn on the interface and launch the PASCO data acquisition

software, such as PASCO Capstone..

2. In PASCO Capstone, click the “Hardware Setup” icon in

the Tools palette to open the “Hardware Setup” panel.

3. In the “Hardware Setup” panel, click “Add Sensor/Instru­ment” to open the “Add Sensor or Instrument” window.

4. In the “Add Sensor or Instrument window, click the “Sensor
or Instrument Type” menu and select “ScienceWorkshop
Digital Sensors” from the list.

5. Select “Motion Sensor II” in the list and then click “OK”.

2. The SPARKvue program recognizes that the Digital Adapter

is connected to the interface, and shows a screen with a list
of digital sensors. Press “Motion Sensor” and then press
“OK”.

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Motion Sensor II CI-6742A

1) Select a
parameter.

2) Press

Show.

Recording

Mode menu

Sample Rate setting

3. Press “OK” in the Edit Sensor Properties screen, and then
press to select “Position”, “Velocity”, or “Acceleration” in
the next screen.

4. Press “Show” to create a Graph screen. The Graph shows the
parameter you selected on the vertical axis, and time on the
horizontal axis.

To Aim the Motion Sensor at an Object

Data Collection

To Record Data

1. In PASCO Capstone, click Record. In SPARKvue, press
Start.

• The Motion Sensor starts clicking. If a target is in range, the
target indicator flashes with each click. The data acquisition
software starts collecting and displaying data.

2. Click Stop to stop data collection.

To Display Data without Recording

PASCO Capstone

Click the Recording Mode menu and select
Fast Monitor Mode. The Record icon changes

to a Monitor icon. Click Monitor to display
live data without recording it.

Sensor Configuration

1. Set the range switch to short range ( ) or long range ( )

setting.

• Select for measuring a cart on a track.

• Select for measuring most other objects.

2. Arrange the Motion Sensor and object so that the Motion

Sensor's transducer faces the object.

• The object should be at least 15 cm from the transducer.

• If the object will move, it should move directly toward
or away from the Motion Sensor.

• Aim the motion sensor slightly up to avoid detecting the
tabletop.

3. Remove objects that may interfere with the measurement.

These include objects between the sensor and target object,
either directly in front of the sensor or to the sides.

To Change the Sample Rate

PASCO Capstone

Click the up or down button next
to the Sample Rate setting.

SPARKvue

In the Graph display screen, press the Sampling Options icon.
Select the Sampling Mode, Sample Rate, and Sample Rate
Unit in the Sampling Options screen, and then press OK.

The normal range of sampling rates is between 1 Hz and 50 Hz.
At the default rate, the Motion Sensor can measure distance up to
8 m. The maximum distance decreases with increasing sample
rate. At very high sample rates (between 50 Hz and 250 Hz), the
maximum distance is less than 2 m.

Equipment Mounting

Mount the Motion Sensor as illustrated on a vertical rod (a) or a
horizontal rod (b).

Integrated clips allow it to be attached to the end of a dynamics
track (c).

A threaded hole in the bottom of the unit (d) is provided for
attachment to the PS-2546 Magnetic Bracket (e), the ME-6743

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Motion Sensor II CI-6742A

(a)

(b)

(c)

(d)

(e)

(f)

(g)

(h)

Cart Adapter (f), and other 1/4-20 threaded mounting devices
such as a camera tripod.

To protect the Motion Sensor from being hit by an object, use a
device such as the SE-7256 Motion Sensor Guard (g) or
ME-9806 bracket with a rubber band (h). The Motion Sensor can
“see through” a wire screen or rubber band placed close to the
transducer.

Troubleshooting

If the Motion Sensor fails to perform satisfactorily, try these
steps:

• Ensure that the target object is no closer than 15 cm.

• Switch the range switch to the other setting.

• Adjust the aim left, right, up, or down. In some cases the
Motion Sensor works best when it is aimed slightly to the
side or above the target in order to exclude interfering
objects.

• Improve the target by adding a larger or harder surface to
reflect ultrasound. A small object can be a better reflector
than large object if it has a harder surface.

• Remove interfering objects near the target object or sensor.

• Increase or decrease the sample rate.

Theory of Operation

The Motion Sensor uses an electrostatic transducer as both a
speaker and a microphone. When triggered by the interface, the
transducer transmits a burst of 16 ultrasonic pluses with a fre­quency of about 49 kHz. This burst of pulses can be heard as a
single click. The ultrasonic pulses reflect off an object and return
to the sensor. The tar get indicator on the sensor flashes when
transducer detects an echo.

Sound intensity decreases with distance; to compensate, the sen­sor increases the gain of the receiver amplifier as it waits for the
echo. The increased gain allows the sensor to detect an object up
to 8 m away. The lower gain at the beginning of the cycle reduces
the circuit's sensitivity to echoes from false targets.

The interface measures the time between trigger rising edge and
the echo rising edge. The data acquisition software uses this time
and the speed of sound to calculate the distance to the object. To
determine velocity, the software uses consecutive position mea­surements to calculate the rate of change of position. Similarly, it
determines acceleration using consecutive velocity measure­ments.

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Motion Sensor II CI-6742A

Specifications

Minimum Range 15 cm
Maximum Range 8 m
Transducer Rotation 360°
Range Settings Short Range: for distance measurement up

Mounting Options On rod up to 12.7 mm diameter

Connector Dual stereo phone plug for

to 2 m with improved rejection of false target
signals and air-track noise
Long Range: for distance measurement up
to 8 m

Directly to PASCO dynamics tracks
On table top

ScienceWorkshop-compatible interfaces

Technical Support

For assistance with any PASCO product, contact PASCO at:

Address:

Phone:

Web: www.pasco.com
Email: [e-mail]

PASCO scientific
10101 Foothills Blvd.
Roseville, CA 95747-7100

916-786-3800 (worldwide)
800-772-8700 (U.S.)

The European Union WEEE (Waste Elec­tronic and Electrical Equipment) symbol (to
the right) and on the product or its packag­ing indicates that this product must not be
disposed of in a standard waste container.

Limited Warranty For a description of the product warranty, see the
PASCO catalog.

Copyright The PASCO scientific 012-09624B Motion Sensor II Instruc-
tion Sheet is copyrighted with all rights reserved. Permission is granted to

non-profit educational institutions for reproduction of any part of this man­ual, providing the reproductions are used only in their laboratories and
classrooms, and are not sold for profit. Reproduction under any other cir­cumstances, without the written consent of PASCO scientific, is prohibited.
Trademarks PASCO, PASCO scientific, PASCO Capstone, SPARK SLS,
and SPARKvue are trademarks or registered trademarks of PASCO scien­tific, in the United States and/or in other countries. All other brands, prod­ucts, or service names are or may be trademarks or service marks of, and
are used to identify, products or services of, their respective owners. For
more information visit www.pasco.com/legal.

Product End of Life Disposal Instructions:

This electronic product is subject to disposal and recycling regu­lations that vary by country and region. It is your responsibility to
recycle your electronic equipment per your local environmental
laws and regulations to ensure that it will be recycled in a manner
that protects human health and the environment. To find out
where you can drop off your waste equipment for recycling,
please contact your local waste recycle/disposal service, or the
place where you purchased the product.

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