28125 Parallax Inc, 28125 Datasheet - Page 251

• Manufacturer Part Number: 28125
• Description: TEXT ROBOTICS
• Manufacturer: Parallax Inc

Specifications of 28125

• Title: Robotics with the Boe-Bot
• Product: Microcontroller Accessories
• Lead Free Status / RoHS Status: Not applicable / Not applicable

Parts List:
ACTIVITY #1: BUILDING AND TESTING THE IR PAIRS
In this activity, you will build and test the infrared transmitter/detector pairs.
(2) Infrared detectors
(2) IR LEDs (clear case)
(2) IR LED shield assemblies
(2) Resistors - 220 Ω
(2) Resistors – 1 kΩ
Building the IR Headlights
(red-red-brown)
(brown-black-red)
√
√
√
Insert the infrared LED into the shield assembly as shown in Figure 7-3.
Make sure the LED snaps into the larger part of the housing.
Snap the smaller part of the housing over the LED case and onto the larger part.
Some fluorescent lights do generate signals that can be detected by the IR detectors.
These lights can cause problems for your Boe-Bot’s infrared headlights. One of the things
you will do in this chapter is develop an infrared interference “sniffer” that you can use to test
the fluorescent lights near your Boe-Bot courses.
+
-
IR LED will snap in.
+
-
1
2
3
Longer lead
+
-
Figure 7-3
Snapping the IR
LED into the
Shield Assembly
1
2
3
Flattened
edge
Figure 7-2
New Parts
Used in this
Chapter
IR detector
(top)
IR LED
(middle)
IR LED
shield
assembly
(bottom)