Parallax Boe-Bot Student Manual page 270

Page 256 · Robotics with the Boe-Bot
√
Build a course similar to the electrical tape delimited course shown in Figure 7-
9. Use at least three strips of electrical tape, edge to edge with no paper visible
between the strips.
√
Replace your 1 kΩ resistors with 2 kΩ resistors (red-black-red) to connect P2 to
its IR LED and P8 to its IR LED. We want the Boe-Bot to be nearsighted for
this activity.
√
Reconnect power to your board.
√
Run the program IrInterferenceSniffer.bs2 (page 246) to make sure that nearby
fluorescent lighting will not interfere with your Boe-Bot's IR detectors.
√
Use the TestIrPairsAndIndicators.bs2 (page 244) to make sure that the Boe-Bot
detects the poster board but does not detect the electrical tape.
If the Boe-Bot still "sees" the electrical tape too clearly, here are a few remedies:
√
Try adjusting the IR detectors and LEDs downward at various angles.
√
Try a different brand of vinyl electrical tape.
√
Try replacing the 2 kΩ resistors with 4.7 kΩ (yellow-violet-red) resistors to make the
Boe-Bot more nearsighted.
√
Adjust the
arguments that will make the Boe-Bot more nearsighted: 38250, 39500, 40500
If you are using older IR LEDs, the Boe-Bot might actually be having problems with being
too nearsighted. Here are some remedies that will increase the Boe-Bot's sensitivity to
objects and make it more far sighted:
√
Try 1 kΩ (brown-black-red) or 470 Ω (yellow-violet-brown) or even 220 Ω (red-red-
brown) resistors in series with the IR LEDs instead of 2 kΩ.
command with different
FREQOUT
arguments. Here are some
Freq1