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 FREQOUT command with different Freq1 arguments. Here are some
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.
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