Datasheet

Navigating with Infrared Headlights • Chapter 7

Robotics with the BOE Shield-Bot • 239

 Build a course like one shown below. For electrical tape, make a small test patch

on a piece of paper first to make sure the infrared detectors cannot see a

reflection from it. If it does not reflect infrared, use three strips edge to edge on

the poster board with no paper visible between the strips.

 Run the sketch IrInterferenceSniffer to make sure that nearby fluorescent

lighting will not interfere with your BOE Shield-Bot’s IR detectors.

 Use TestBothIrAndIndicators to make sure that the BOE Shield-Bot detects the

poster board but does not detect the electrical tape or paint.

If the BOE Shield-Bot still "sees" the electrical tape too clearly:

 Try adjusting the IR detectors and LEDs downward at shallower 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 Shield-Bot more nearsighted.

 Adjust the

tone command with different frequency arguments. Here are some

arguments that will make the BOE Shield-Bot more nearsighted: 39000, 40000,

41000.

If the Boe Shield-Bot seems nearsighted:

If you are using older IR LEDs, the BOE Shield-Bot might actually be having problems with

being too nearsighted. Here are some remedies that will increase the BOE Shield-Bot’s

sensitivity to objects and make it more far sighted:

 Try replacing the 2 kΩ (red-black-red) resistors with 1 kΩ (red-black-brown) or

even 470 Ω (yellow-violet-brown) resistors in series with the IR LEDs instead of

2 kΩ.

 Try pointing the IR LEDs and detectors downward at a steeper angle so that the

bot is looking at the surface right in front of it.

22” (56 cm)

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