Reports.QTILineSensor History

Hide minor edits - Show changes to output

April 26, 2007, at 06:50 PM by Raphael Zollinger -
Changed lines 87-93 from:
* Out of bounds detector : simple border detector for a two wheeled vehicle, turns left when it reads white. [[http://itp.nyu.edu/~rz403/docu/qti_arduinoDigCode.txt | link to ardunio code ]] and [[http://itp.nyu.edu/~rz403/docu/sensorPres3.mov | link to QuickTime movie ]] of QTI and on vehicle

* read gray scale/brightness of surface : [[http://itp
.nyu.edu/~rz403/docu/qti_arduinoAnalogCode.txt | link to sample arduino analog code ]] // [[http://itp.nyu.edu/~rz403/docu/QTI_processing.txt | link to sample cooresponding processing code ]]


http:
//itp.nyu.edu/~rz403/docu/analog_procQTI.png | '''gray scale reader/freq out screen shot'''
to:
* Out of bounds detector : simple border detector for a two wheeled vehicle, turns left when it reads white. [[http://itp.nyu.edu/~rz403/docu/qti_arduinoDigCode.txt | link to ardunio code ]] and [[http://itp.nyu.edu/~rz403/docu/sensorPres3.mov | link to QuickTime movie ]] of QTI on a vehicle that stops and turns left when it senses white vs black.

* read gray scale
/brightness of surface : [[http://itp.nyu.edu/~rz403/docu/qti_arduinoAnalogCode.txt | link to sample arduino analog code ]] // [[http://itp.nyu.edu/~rz403/docu/QTI_processing.txt | link to sample corresponding processing code ]]


http://itp.nyu.edu/~rz403/docu/analog_procQTI.png | '''Processing gray scale reader +
freq out screen shot'''
April 26, 2007, at 06:46 PM by Raphael Zollinger -
Changed lines 87-91 from:
* Out of bounds detector : simple border detector for a two wheeled vehicle, turns left when it reads white. [[http://itp.nyu.edu/~rz403/docu/qti_arduinoDigCode.txt | link to ardunio code ]]


[[http://itp.nyu.edu/~rz403/docu/sensorPres3.mov | link to quicktime of QTI and on vehicle]]
to:
* Out of bounds detector : simple border detector for a two wheeled vehicle, turns left when it reads white. [[http://itp.nyu.edu/~rz403/docu/qti_arduinoDigCode.txt | link to ardunio code ]] and [[http://itp.nyu.edu/~rz403/docu/sensorPres3.mov | link to QuickTime movie ]] of QTI and on vehicle
April 26, 2007, at 06:45 PM by Raphael Zollinger -
Added lines 89-91:

[[http://itp.nyu.edu/~rz403/docu/sensorPres3.mov | link to quicktime of QTI and on vehicle]]
April 26, 2007, at 06:39 PM by Raphael Zollinger -
Added lines 91-93:

http://itp.nyu.edu/~rz403/docu/analog_procQTI.png | '''gray scale reader/freq out screen shot'''
April 24, 2007, at 08:20 PM by Raphael Zollinger -
Changed lines 96-97 from:
Make sure that the QTI sensor is properly installed by matching up the pins. The “B” \\
connects
to Vss. The “R” connects to pin 9 of the BASIC Stamp and the “W” connects \\
to:
Make sure that the QTI sensor is properly installed by matching up the pins. The “B”
connects to Vss. The “R” connects to pin 9 of the BASIC Stamp and the “W” connects
April 24, 2007, at 04:09 PM by Raphael Zollinger -
Changed lines 77-78 from:
1.4 V if it detects a white surface. In other words, the QTI sends a binary-1 if it does not see its IR \\
reflection or a binary-0 if it does. Only one QTI should be turned on at any given time to make sure that \\
to:
1.4 V if it detects a white surface. In other words, the QTI sends a binary-1 if it does not see its IR
reflection or a binary-0 if it does. Only one QTI should be turned on at any given time to make sure that
Changed lines 80-82 from:
will drive the voltage at digital pin low; otherwise, it will be pulled high by the 10 kΩ resistor. \\
to:
will drive the voltage at digital pin low; otherwise, it will be pulled high by the 10 kΩ resistor.
April 24, 2007, at 04:07 PM by Raphael Zollinger -
Changed line 76 from:
If you apply 5 V to a QTI's W pin, its R pin will rise above 1.4 V if it detects a black surface, or fall below \\
to:
If you apply 5 V to a QTI's W pin, its R pin will rise above 1.4 V if it detects a black surface, or fall below
April 24, 2007, at 04:06 PM by Raphael Zollinger -
Added line 73:
Added line 82:
April 24, 2007, at 04:05 PM by Raphael Zollinger -
Changed lines 59-60 from:
through the IR transistor. Since the IR transistor conducts more or less current depending on how much IR it receives, the analog measurement \\
can
give you an indication of distance or shade of gray. \\
to:
through the IR transistor. Since the IR transistor conducts more or less current depending on how much IR it receives, the analog measurement
can give you an indication of distance or shade of gray.
Changed line 67 from:
surface, the voltage at R goes above 1.4 V. Since the BASIC Stamp interprets any voltage \\
to:
surface, the voltage at R goes above 1.4 V. Since the micro controller interprets any voltage \\
April 24, 2007, at 04:00 PM by Raphael Zollinger -
Changed lines 35-37 from:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause \\
current
to flow through the 470 ohm resistor to the LED side of the QRD1114. \\
IR light reflecting of the surface below will cause a change in
the ability for the \\
to:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause
current to flow through the 470 ohm resistor to the LED side of the QRD1114.
IR light reflecting of the surface below will cause a change in the ability for the
April 24, 2007, at 04:00 PM by Raphael Zollinger -
Changed line 38 from:
current to flow through the phototransistor side of the QRD1114. \\
to:
current to flow through the phototransistor side of the QRD1114.
April 23, 2007, at 10:12 PM by Raphael Zollinger -
April 23, 2007, at 10:10 PM by Raphael Zollinger -
Changed lines 87-88 from:
* read gray scale/brightness of surface
to:
* read gray scale/brightness of surface : [[http://itp.nyu.edu/~rz403/docu/qti_arduinoAnalogCode.txt | link to sample arduino analog code ]] // [[http://itp.nyu.edu/~rz403/docu/QTI_processing.txt | link to sample cooresponding processing code ]]
April 23, 2007, at 10:00 PM by Raphael Zollinger -
Changed lines 50-51 from:
The QTI module is designed for close proximity infrared (IR) detection. Take a look at the small square black box just above the QTI label. \\
It’s
nested below the capacitor and between the two resistors. That’s a QRD1114 reflective object sensor. There’s an infrared diode behind its \\
to:
The QTI module is designed for close proximity infrared (IR) detection. Take a look at the small square black box just above the QTI label.
It’s nested below the capacitor and between the two resistors. That’s a QRD1114 reflective object sensor. There’s an infrared diode behind its
Changed lines 85-86 from:
* Out of bounds detector
to:
* Out of bounds detector : simple border detector for a two wheeled vehicle, turns left when it reads white. [[http://itp.nyu.edu/~rz403/docu/qti_arduinoDigCode.txt | link to ardunio code ]]
April 23, 2007, at 09:28 PM by Raphael Zollinger -
Changed line 58 from:
remains constant. With this circuit, you can read the values into an anolog pin to measure how long it takes the capacitor to discharge \\
to:
remains constant. With this circuit, you can read the values into an analog pin to measure how long it takes the capacitor to discharge \\
April 23, 2007, at 09:26 PM by Raphael Zollinger -
Changed lines 38-39 from:
current to flow through the phototransistor side of the QRD1114. The \\
transistor, in effect, behaves like an IR controlled resistance.
to:
current to flow through the phototransistor side of the QRD1114. \\
The
transistor, in effect, behaves like an IR controlled resistance.
Changed lines 78-83 from:
one QTI doesn't see the reflection of another QTI's IR signal. With this rule in mind, P5, P6, and P7 each \\
connect to a QTI's W pin. P5 connects to
the right QTI, P6 to the center QTI, and P7 to the left QTI. All \\
the B pins are tied to Vss. All the R pins are tied together and connected to P3. We'll turn each QTI on, \\
one at a time, read P3, and then turn that QTI off again. If the QTI that receives 5 V sees it reflection, it
will drive the voltage at P3
low; otherwise, it will be pulled high by the 10 kΩ resistor. \\
to:
one QTI doesn't see the reflection of another QTI's IR signal. Turn each QTI on one at a time, read the digital pin, and then turn that QTI off again. If the QTI that receives 5 V sees it reflection, it
will drive the voltage at digital pin
low; otherwise, it will be pulled high by the 10 kΩ resistor. \\
Changed lines 85-89 from:
* Out of bounds detecter

* read grey scale/brightness of surface
to:
* Out of bounds detector

* read gray scale/brightness of surface

* read distance, though not far, at most maybe .5"
April 23, 2007, at 08:58 PM by Raphael Zollinger -
Changed lines 71-72 from:
http://itp.nyu.edu/~rz403/docu/twoCircuits.png
to:
http://itp.nyu.edu/~rz403/docu/twoCircuits.png | '''analog vs digital circuit'''
April 23, 2007, at 08:57 PM by Raphael Zollinger -
Changed lines 58-59 from:
remains constant. With this circuit, you can set P3 high and then test it with RCTIME to measure how long it takes the capacitor to discharge \\
through the IR transistor. Since the IR transistor conducts more or less current depending on how much IR it receives, the RCTIME measurement \\
to:
remains constant. With this circuit, you can read the values into an anolog pin to measure how long it takes the capacitor to discharge \\
through the IR transistor. Since the IR transistor conducts more or less current depending on how much IR it receives, the analog measurement \\
Changed lines 69-70 from:
way to detect a black line on a white background. \\
to:
way to detect a black line on a white background.

http://itp.nyu.edu/~rz403/docu/twoCircuits.png
April 23, 2007, at 08:44 PM by Raphael Zollinger -
Changed lines 46-47 from:
http://itp.nyu.edu/~rz403/docu/qtiChart.png
to:
http://itp.nyu.edu/~rz403/docu/IRGraph.png
April 23, 2007, at 08:43 PM by Raphael Zollinger -
Added lines 46-47:
http://itp.nyu.edu/~rz403/docu/qtiChart.png
Added lines 82-91:
!!!{+Applications+}

* Line following

* Out of bounds detecter

* read grey scale/brightness of surface


!!!{+Trouble Shooting Tips+}
Added lines 93-95:
Make sure that the QTI sensor is properly installed by matching up the pins. The “B” \\
connects to Vss. The “R” connects to pin 9 of the BASIC Stamp and the “W” connects \\
to pin 10 of the BASIC Stamp.
Deleted line 96:
!!!{+Trouble Shooting Tips+}
Changed lines 98-103 from:
Make sure that the QTI sensor is properly installed by matching up the pins. The “B” \\
connects to Vss. The “R” connects to pin 9 of the BASIC Stamp and the “W” connects \\
to pin 10 of the BASIC Stamp.

to:
April 23, 2007, at 08:34 PM by Raphael Zollinger -
Changed line 5 from:
!!{+Introduction+}
to:
!!!{+Introduction+}
Changed line 14 from:
!!{+Features+}
to:
!!!{+Features+}
Changed line 23 from:
!!{+Dimensions+}
to:
!!!{+Dimensions+}
Changed lines 33-35 from:
!!{+Description+}

The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause \\
to:
!!!{+Description+}

The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause \\
Changed line 37 from:
IR light reflecting of the surface below will cause a change in the ability for the \\
to:
IR light reflecting of the surface below will cause a change in the ability for the \\
Changed lines 42-43 from:
!!{+Specifications+}
to:
!!!{+Specifications+}
Changed lines 46-47 from:
!!{+A Closer Look at the QTI+}
to:
!!!{+A Closer Look at the QTI+}
Changed line 54 from:
{+two modes+}:
to:
!!!!!{+two modes+}:
Changed lines 69-70 from:
!!{+Building the Sensing Circuits+}
to:
!!!{+Building the Sensing Circuits+}
Changed line 82 from:
!!{+Trouble Shooting Tips+}
to:
!!!{+Trouble Shooting Tips+}
April 23, 2007, at 06:57 PM by Raphael Zollinger -
Added line 20:
Changed lines 89-90 from:
Web: www.parallax.com\\
to:

Web: www.parallax.com \\
April 23, 2007, at 06:56 PM by Raphael Zollinger -
Changed lines 88-89 from:
Web: www.parallax.com \\
E-mail: support@parallax.com \\
to:
Web: www.parallax.com\\
E-mail: support@parallax.com \\
April 23, 2007, at 06:55 PM by Raphael Zollinger -
Deleted line 88:
Deleted line 89:
Deleted line 90:
April 23, 2007, at 06:54 PM by Raphael Zollinger -
Changed line 1 from:
!QTI Line Sensor
to:
QTI Line Sensor
Deleted line 87:
Added line 89:
Added line 91:
Added line 93:
April 23, 2007, at 06:53 PM by Raphael Zollinger -
Changed line 1 from:
!!QTI Line Sensor
to:
!QTI Line Sensor
Changed line 5 from:
!{+Introduction+}
to:
!!{+Introduction+}
Changed line 14 from:
!{+Features+}
to:
!!{+Features+}
Changed lines 21-22 from:
{+Dimensions+}
to:

!!
{+Dimensions+}
Changed lines 32-33 from:
{+Description+}
to:
!!{+Description+}
Changed lines 41-42 from:
{+Specifications+}
to:
!!{+Specifications+}
Changed lines 45-46 from:
{+A Closer Look at the QTI+}
to:
!!{+A Closer Look at the QTI+}
Changed lines 68-69 from:
{+Building the Sensing Circuits+}
to:
!!{+Building the Sensing Circuits+}
Changed line 81 from:
{+Trouble Shooting Tips+}
to:
!!{+Trouble Shooting Tips+}
April 23, 2007, at 06:52 PM by Raphael Zollinger -
Changed line 1 from:
QTI Line Sensor
to:
!!QTI Line Sensor
Changed line 5 from:
{+Introduction+}
to:
!{+Introduction+}
Changed line 14 from:
{+Features+}
to:
!{+Features+}
April 23, 2007, at 06:50 PM by Raphael Zollinger -
Deleted line 87:
April 23, 2007, at 06:48 PM by Raphael Zollinger -
April 23, 2007, at 06:48 PM by Raphael Zollinger -
Changed lines 34-35 from:
current to flow through the 470 ohm resistor to the LED side of the QRD1114. \\
IR light reflecting of the surface below will cause a change in the ability for the \\
to:
current to flow through the 470 ohm resistor to the LED side of the QRD1114. \\
IR light reflecting of the surface below will cause a change in the ability for the \\
April 23, 2007, at 06:47 PM by Raphael Zollinger -
Changed line 37 from:
transistor, in effect, behaves like an IR controlled resistance. \\
to:
transistor, in effect, behaves like an IR controlled resistance.
April 23, 2007, at 06:46 PM by Raphael Zollinger -
April 23, 2007, at 06:43 PM by Raphael Zollinger -
Changed line 33 from:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause \\
to:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause \\
Changed lines 53-56 from:
When used as an analog sensor, the QTI can detect shades of gray on paper and distances over a short range if the light in the room
remains constant. With this circuit, you can set P3 high and then test it with RCTIME to measure how long it takes the capacitor to discharge
through the IR transistor. Since the IR transistor conducts more or less current depending on how much IR it receives, the RCTIME measurement
can give you an indication of distance or shade of gray.
to:
When used as an analog sensor, the QTI can detect shades of gray on paper and distances over a short range if the light in the room \\
remains constant. With this circuit, you can set P3 high and then test it with RCTIME to measure how long it takes the capacitor to discharge \\
through the IR transistor. Since the IR transistor conducts more or less current depending on how much IR it receives, the RCTIME measurement \\
can give you an indication of distance or shade of gray. \\
Changed lines 58-66 from:
If all you want to know is whether a line is black or white, the QTI can be converted to a
digital sensor by adding a 10 kΩ resistor across its W and R terminals. After doing so, the
QTI behaves similarly to the circuit on the right. When W is connected to Vdd and B is
connected to Vss, the R terminal’s voltage will drop below 1.4 V when the IR transistor sees
infrared reflected from the IR LED. When the IR LED’s signal is mostly absorbed by a black
surface, the voltage at R goes above 1.4 V. Since the BASIC Stamp interprets any voltage
above 1.4 V as 1 and any voltage below 1.4 V as 0, this circuit gives us a quick and easy
way to detect a black line on a white background.
to:
If all you want to know is whether a line is black or white, the QTI can be converted to a \\
digital sensor by adding a 10 kΩ resistor across its W and R terminals. After doing so, the \\
QTI behaves similarly to the circuit on the right. When W is connected to Vdd and B is \\
connected to Vss, the R terminal’s voltage will drop below 1.4 V when the IR transistor sees \\
infrared reflected from the IR LED. When the IR LED’s signal is mostly absorbed by a black \\
surface, the voltage at R goes above 1.4 V. Since the BASIC Stamp interprets any voltage \\
above 1.4 V as 1 and any voltage below 1.4 V as 0, this circuit gives us a quick and easy \\
way to detect a black line on a white background. \\
Changed lines 68-73 from:
If you apply 5 V to a QTI's W pin, its R pin will rise above 1.4 V if it detects a black surface, or fall below
1.4 V if it detects a white surface. In other words, the QTI sends a binary-1 if it does not see its IR
reflection or a binary-0 if it does. Only one QTI should be turned on at any given time to make sure that
one QTI doesn't see the reflection of another QTI's IR signal. With this rule in mind, P5, P6, and P7 each
connect to a QTI's W pin. P5 connects to the right QTI, P6 to the center QTI, and P7 to the left QTI. All
the B pins are tied to Vss. All the R pins are tied together and connected to P3. We'll turn each QTI on,
to:

If you apply 5 V to a QTI's W pin, its R pin will rise above 1.4 V if it detects a black surface, or fall below \\
1.4 V if it detects a white surface. In other words, the QTI sends a binary-1 if it does not see its IR \\
reflection or a binary-0 if it does. Only one QTI should be turned on at any given time to make sure that \\
one QTI doesn't see the reflection of another QTI's IR signal. With this rule in mind, P5, P6, and P7 each \\
connect to a QTI's W pin. P5 connects to the right QTI, P6 to the center QTI, and P7 to the left QTI. All \\
the B pins are tied to Vss. All the R pins are tied together and connected to P3. We'll turn each QTI on, \\
Changed lines 76-77 from:
will drive the voltage at P3 low; otherwise, it will be pulled high by the 10 kΩ resistor.
to:
will drive the voltage at P3 low; otherwise, it will be pulled high by the 10 kΩ resistor. \\
Changed lines 82-83 from:
Make sure that the QTI sensor is properly installed by matching up the pins. The “B”
connects to Vss. The “R” connects to pin 9 of the BASIC Stamp and the “W” connects
to:
Make sure that the QTI sensor is properly installed by matching up the pins. The “B” \\
connects
to Vss. The “R” connects to pin 9 of the BASIC Stamp and the “W” connects \\
Changed lines 89-93 from:
Web: www.parallax.com
E-mail: support@parallax.com
Fax: (916) 624-8003
Phone: (916) 624-8333
to:
Web: www.parallax.com \\
E-mail: support@parallax.com \\
Fax: (916) 624-8003 \\
Phone: (916) 624-8333 \\
April 23, 2007, at 06:40 PM by Raphael Zollinger -
Deleted line 20:
Added lines 32-37:

The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause \\
current to flow through the 470 ohm resistor to the LED side of the QRD1114. \\
IR light reflecting of the surface below will cause a change in the ability for the \\
current to flow through the phototransistor side of the QRD1114. The \\
transistor, in effect, behaves like an IR controlled resistance. \\
Deleted lines 38-42:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause \\
current to flow through the 470 ohm resistor to the LED side of the QRD1114. \\
IR light reflecting of the surface below will cause a change in the ability for the \\
current to flow through the phototransistor side of the QRD1114. The \\
transistor, in effect, behaves like an IR controlled resistance. \\
Deleted line 39:
Added lines 44-92:
{+A Closer Look at the QTI+}

The QTI module is designed for close proximity infrared (IR) detection. Take a look at the small square black box just above the QTI label. \\
It’s nested below the capacitor and between the two resistors. That’s a QRD1114 reflective object sensor. There’s an infrared diode behind its \\
clear window and an infrared transistor behind its black window. When the infrared emitted by the diode reflects off a surface and \\
returns to the black window, it strikes the infrared transistor’s base, causing it to conduct current. The more infrared incident on the \\
transistor’s base, the more current it conducts.

{+two modes+}:
When used as an analog sensor, the QTI can detect shades of gray on paper and distances over a short range if the light in the room
remains constant. With this circuit, you can set P3 high and then test it with RCTIME to measure how long it takes the capacitor to discharge
through the IR transistor. Since the IR transistor conducts more or less current depending on how much IR it receives, the RCTIME measurement
can give you an indication of distance or shade of gray.

If all you want to know is whether a line is black or white, the QTI can be converted to a
digital sensor by adding a 10 kΩ resistor across its W and R terminals. After doing so, the
QTI behaves similarly to the circuit on the right. When W is connected to Vdd and B is
connected to Vss, the R terminal’s voltage will drop below 1.4 V when the IR transistor sees
infrared reflected from the IR LED. When the IR LED’s signal is mostly absorbed by a black
surface, the voltage at R goes above 1.4 V. Since the BASIC Stamp interprets any voltage
above 1.4 V as 1 and any voltage below 1.4 V as 0, this circuit gives us a quick and easy
way to detect a black line on a white background.

{+Building the Sensing Circuits+}
If you apply 5 V to a QTI's W pin, its R pin will rise above 1.4 V if it detects a black surface, or fall below
1.4 V if it detects a white surface. In other words, the QTI sends a binary-1 if it does not see its IR
reflection or a binary-0 if it does. Only one QTI should be turned on at any given time to make sure that
one QTI doesn't see the reflection of another QTI's IR signal. With this rule in mind, P5, P6, and P7 each
connect to a QTI's W pin. P5 connects to the right QTI, P6 to the center QTI, and P7 to the left QTI. All
the B pins are tied to Vss. All the R pins are tied together and connected to P3. We'll turn each QTI on,
one at a time, read P3, and then turn that QTI off again. If the QTI that receives 5 V sees it reflection, it
will drive the voltage at P3 low; otherwise, it will be pulled high by the 10 kΩ resistor.



{+Trouble Shooting Tips+}

Make sure that the QTI sensor is properly installed by matching up the pins. The “B”
connects to Vss. The “R” connects to pin 9 of the BASIC Stamp and the “W” connects
to pin 10 of the BASIC Stamp.




Web: www.parallax.com
E-mail: support@parallax.com
Fax: (916) 624-8003
Phone: (916) 624-8333
April 23, 2007, at 06:37 PM by Raphael Zollinger -
Changed line 5 from:
Introduction{+underline+}
to:
{+Introduction+}
Changed line 14 from:
Features{+underline+}
to:
{+Features+}
Changed line 22 from:
Dimensions{+underline+}
to:
{+Dimensions+}
Changed line 32 from:
Description{+underline+}
to:
{+Description+}
Changed lines 41-44 from:
Specifications

http://itp.nyu.edu/~rz403/docu/qti chart.png"Specs" |
to:
{+Specifications+}

http://itp.nyu.edu/~rz403/docu/qtiChart.png
April 23, 2007, at 06:34 PM by Raphael Zollinger -
Changed line 5 from:
Introduction
to:
Introduction{+underline+}
Changed line 14 from:
Features //
to:
Features{+underline+}
Changed line 22 from:
Dimensions
to:
Dimensions{+underline+}
Changed line 32 from:
Description
to:
Description{+underline+}
April 23, 2007, at 06:32 PM by Raphael Zollinger -
Changed lines 43-44 from:
http://itp.nyu.edu/~rz403/docu/qti chart.png"Specs"
to:
http://itp.nyu.edu/~rz403/docu/qti chart.png"Specs" |
April 23, 2007, at 06:32 PM by Raphael Zollinger -
Changed lines 43-44 from:
http://itp.nyu.edu/~rz403/docu/qti chart.png
to:
http://itp.nyu.edu/~rz403/docu/qti chart.png"Specs"
April 23, 2007, at 06:31 PM by Raphael Zollinger -
Changed lines 8-9 from:
the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the
reflectivity is very low; when the QTI is over a light surface, the reflectivity is very
to:
the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the \\
reflectivity
is very low; when the QTI is over a light surface, the reflectivity is very \\
Changed lines 34-35 from:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause\\
current to flow through the 470 ohm resistor to the LED side of the QRD1114.\\
to:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause \\
current to flow through the 470 ohm resistor to the LED side of the QRD1114. \\
Added lines 43-44:
http://itp.nyu.edu/~rz403/docu/qti chart.png
April 23, 2007, at 06:28 PM by Raphael Zollinger -
Changed line 7 from:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine
to:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine \\
April 23, 2007, at 06:27 PM by Raphael Zollinger -
Changed lines 7-8 from:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine
to:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine
April 23, 2007, at 06:25 PM by Raphael Zollinger -
Changed lines 7-10 from:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine\\
the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the\\
reflectivity is very low; when the QTI is over a light surface, the reflectivity is very \\
high and will cause a different reading from the sensor. \\
to:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine

the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the
reflectivity is very low; when the QTI is over a light surface, the reflectivity is very
high and will cause a different reading from the sensor.
Changed lines 13-14 from:
available from Parallax: $5.95//
to:
available from Parallax: $5.95
April 23, 2007, at 06:23 PM by Raphael Zollinger -
April 23, 2007, at 06:23 PM by Raphael Zollinger -
Changed lines 34-38 from:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause//
current to flow through the 470 ohm resistor to the LED side of the QRD1114.//
IR light reflecting of the surface below will cause a change in the ability for the //
current to flow through the phototransistor side of the QRD1114. The //
transistor, in effect, behaves like an IR controlled resistance. //
to:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause\\
current to flow through the 470 ohm resistor to the LED side of the QRD1114.\\
IR light reflecting of the surface below will cause a change in the ability for the \\
current to flow through the phototransistor side of the QRD1114. The \\
transistor, in effect, behaves like an IR controlled resistance. \\
April 23, 2007, at 06:22 PM by Raphael Zollinger -
Changed line 7 from:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine \\
to:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine\\
April 23, 2007, at 06:22 PM by Raphael Zollinger -
Changed lines 7-10 from:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine//
the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the//
reflectivity is very low; when the QTI is over a light surface, the reflectivity is very //
high and will cause a different reading from the sensor. //
to:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine \\
the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the\\
reflectivity is very low; when the QTI is over a light surface, the reflectivity is very \\
high and will cause a different reading from the sensor. \\
April 23, 2007, at 06:22 PM by Raphael Zollinger -
Changed lines 7-10 from:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine
the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the
reflectivity
is very low; when the QTI is over a light surface, the reflectivity is very
high and will cause a different reading from the sensor.
to:
The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine//
the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the//
reflectivity
is very low; when the QTI is over a light surface, the reflectivity is very //
high and will cause a different reading from the sensor. //
Changed lines 12-14 from:
available from Parallax: $5.95

Features
to:
available from Parallax: $5.95//

Features //
Changed lines 34-38 from:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause
current to flow through the 470 ohm resistor to the LED side of the QRD1114.
IR light reflecting of the surface below will cause a change in the ability for the
current to flow through the phototransistor side of the QRD1114. The
transistor, in effect, behaves like an IR controlled resistance.
to:
The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause//
current to flow through the 470 ohm resistor to the LED side of the QRD1114.//
IR light reflecting of the surface below will cause a change in the ability for the //
current to flow through the phototransistor side of the QRD1114. The //
transistor, in effect, behaves like an IR controlled resistance. //
April 23, 2007, at 06:21 PM by Raphael Zollinger -
Added lines 31-42:

Description

The QTI sensor is activated by placing 5 V (Vdd) on the W pin. This will cause
current to flow through the 470 ohm resistor to the LED side of the QRD1114.
IR light reflecting of the surface below will cause a change in the ability for the
current to flow through the phototransistor side of the QRD1114. The
transistor, in effect, behaves like an IR controlled resistance.


Specifications
April 23, 2007, at 06:20 PM by Raphael Zollinger -
Added lines 28-30:


http://itp.nyu.edu/~rz403/docu/qtiPic.png"pic and schematic" | '''QTI Line Lensor and schematic'''
April 23, 2007, at 06:14 PM by Raphael Zollinger -
Changed lines 16-21 from:
Phototransistor Output
No contact surface sensing
Unfocused for sensing diffused surfaces
Compact Package
Daylight filter on sensor
to:
* Phototransistor Output
* No contact surface sensing
* Unfocused for sensing diffused surfaces
* Compact Package
* Daylight filter on sensor
April 23, 2007, at 06:13 PM by Raphael Zollinger -
Added lines 1-27:
QTI Line Sensor
(#550-27401)


Introduction

The Parallax QTI senor uses a QRD1114 infrared (IR) reflective sensor to determine
the reflectivity of the surface below it. When the QTI sensor is over a dark surface, the
reflectivity is very low; when the QTI is over a light surface, the reflectivity is very
high and will cause a different reading from the sensor.

available from Parallax: $5.95

Features

• Phototransistor Output
• No contact surface sensing
• Unfocused for sensing diffused surfaces
• Compact Package
• Daylight filter on sensor

Dimensions

PCB Length: 1”
Overall Length: 1 1⁄4”
PCB Width: 3/8”
Thickness: 5/16”