Chapter 7: Navigating with Infrared Headlights
· Page 237
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.
ACTIVITY #1: BUILDING AND TESTING THE IR PAIRS
In this activity, you will build and test the infrared transmitter/detector pairs.
Parts List:
(2) Infrared detectors
(2) IR LEDs (clear case)
(2) IR LED shield assemblies
(2) Resistors - 220
Ω
(red-red-brown)
(2) Resistors – 1 k
Ω
(brown-black-red)
1
2
3
1
2
3
+
-
Flattened
edge
Longer lead
+
-
Figure 7-2
New Parts
Used in this
Chapter
IR detector
(top)
IR LED
(middle)
IR LED
shield
assembly
(bottom)
Building the IR Headlights
√
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.
+
-
IR LED will snap in.
Figure 7-3
Snapping the IR
LED into the
Shield Assembly
