122-28176 Parallax Inc, 122-28176 Datasheet

122-28176

Manufacturer Part Number

122-28176

Description

GUIDE STUDENT PROCESS CONTROL

Manufacturer

Parallax Inc

Datasheets

1.122-28176.pdf (330 pages)

2.122-28176.pdf (4 pages)

Specifications of 122-28176

Accessory Type

Manual

Product

Microcontroller Accessories

Lead Free Status / RoHS Status

Contains lead / RoHS non-compliant

For Use With/related Products

Propeller Education (PE) Kit

Lead Free Status / RoHS Status

Lead free / RoHS Compliant, Contains lead / RoHS non-compliant

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Errata for Process Control v1.0 (#122-28176)

Chapter 4 Opto-Reflective Switch Use

Background

The opto-reflective switch is used predominately in Chapter 4 as a means to illustrate sensor

sensitivity and response in relation to the sizing of the pull-up resistor on an Infrared (IR)

phototransistor's collector. This errata note will assist in successfully completing Chapter 4

activities and demonstrating the principles intended.

The principle in operation is that an IR LED emits infrared light which is reflected to the

phototransistor from a white surface in close proximity causing the phototransistor to conduct

within its linear range. A black surface will absorb the IR preventing the transistor from

conducting sufficiently. By adjusting the collector resistance (R

how this value affects both the sensitivity and the response of the sensor and BJT transistors in

general.

Issues relating to the successful completion of Chapter 4 activities using the opto-reflective

switch include:

Recommendations are provided, but it will rely upon the understanding of the principles of those

conducting the experiments to ensure their objectives are being met by adjusting test parameters

as necessary to achieve desired results.

Ambient IR Sources

The phototransistor is extremely sensitive to IR light, and as such, care should be taken to

prevent ambient light sources from affecting the experiment. Sunlight, and in some cases

fluorescent light, can affect measurements of the sensor. Care should be taken to limit these

sources if they appear to be affecting the experiment.

Recommendations

When testing Activity #1, position the reflector approximately 2 cm from the detector and

determine the voltage output of the sensor. Darken the area of the experiment as best as possible

and measure once again. There should be no significant voltage change (< 0.5 V).

• Ambient IR sources.

• Part substitution from authorship to publication.

• Reflectivity of inks.

Web Site: www.parallax.com

Forums: forums.parallax.com

Sales: sales@parallax.com

Technical: support@parallax.com

•

v1.0 5/22/06

) the text intends to illustrate

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Fax: (916) 624-8003

Sales: (888) 512-1024

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•

Page 1 of 4

Related parts for 122-28176

122-28176 Summary of contents

Page 1

... Errata for Process Control v1.0 (#122-28176) Chapter 4 Opto-Reflective Switch Use Background The opto-reflective switch is used predominately in Chapter means to illustrate sensor sensitivity and response in relation to the sizing of the pull-up resistor on an Infrared (IR) phototransistor's collector. This errata note will assist in successfully completing Chapter 4 activities and demonstrating the principles intended ...

Page 2

Part Substitution from Authorship to Publication A part substitution was made during editing and formatting of the text from one which was tested and used by the author to the QRB1114. The IR phototransistor in the QRB1114 has a much ...

Page 3

Page 87 recommends moving your hand toward and away from the QRB1114 sensor. The box labeled VCE should show different readings as you move your hand. If the VCE readings do not change, something is amiss, and it is ...

Page 4

IR light and register as a high. The number of transitions is counted to arrive at the RPM of the fan. Recommendations Not all inks absorb IR equally and some may be reflective to this wavelength of light. ...

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