122-28176 Parallax Inc, 122-28176 Datasheet - Page 3

• Manufacturer Part Number: 122-28176
• Description: GUIDE STUDENT PROCESS CONTROL
• Manufacturer: Parallax Inc

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

2. 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 time to troubleshoot:
The amount of voltage drop may be very small. A white piece of paper moved in front of the
sensor will be a better test.
3. Page 87, on specifying the resistor in StampPlot:
When all is working, move on:
Since 1K is not a choice, type the value 1 into the RC(K) drop-down box.
4. Throughout the remainder of the activity, reduce the size of RC by a factor of 10. Page 89,
5. Page 90, Figure 4-6: This figure should be representative of your response for a 10 kΩ value
Activity #2
1. Page 94, Figure 4-9: For R
Activity #6
1. Page 117, Figure 4-18: For R
Activity #7
1. Page 128, Figure 4-9: For R
2. This activity was intended to increases the response and sensitivity of the detector using a
Reflectivity of Inks
The principle employed in the tachometer projects (Activity #6) is the white vane on the encoder
will reflect light causing the phototransistor to conduct, registering as a low. Dark vanes will
√
bottom of page, thus becomes:
√
√
√
√
√
√
of R
Darlington Pair. As the number of vanes increases on the encoder wheel in Activity #6, there
comes a point where the detector is no longer fast enough to respond. With the higher
sensitivity of the opto-reflective switch used and therefore lower value of R
may not be absolutely required.
Verify that 10 is selected from the RC(K) drop-down menu in StampPlot.
Replace R
Select 10 from the RC(K) drop-down menu.
Repeat the activity, and label the resulting line "10 K Ohm response"
Replace R
Select 100 from the RC(K) drop-down menu.
Repeat the activity, and label the resulting line "100 K Ohm response"
© Parallax, Inc. • Errata for Process Control v1.0 (#28176)
C
as opposed to 100 kΩ.
C
C
with a 10 kΩ resistor.
with a 100 kΩ resistor.
6
6
use 1 kΩ and for R
6
use 1 kΩ.
use 1 kΩ and for R
C
use 100 kΩ.
C
use 100 kΩ.
•
v1.0 5/22/06
•
C
Page 3 of 4
, this activity