Datasheet

Chapter 3 • Assemble and Test your BOE Shield-Bot

100 • Robotics with the BOE Shield-Bot

Chapter 3 Challenges

Questions

1. What are some of the symptoms of brownout on the BOE Shield-Bot?

2. What is a reset?

3. How can a piezospeaker be used to announce that brownout just occurred?

4. What function makes the speaker play tones?

5. What’s a hertz? What’s its abbreviation?

Exercises

1. Write a statement that makes a tone, one that sounds different from the start-

alert tone, to signify the end of a sketch.

2. Write a statement that plays a speaker tone to signify an intermediate step in the

sketch. This tone should be different from a start-alert or end tone.

Projects

1. Modify the TestServoSpeed sketch so that it makes a tone signifying each test is

complete.

2. Modify the TestServoSpeed sketch so that it runs both wheels instead of just one

with each test. Make the right wheel turn the opposite direction from the left

wheel.

Question Solutions

1. Symptoms include erratic behavior such as going in unexpected directions or

doing a confused dance.

2. It’s when the Arduino restarts executing a sketch from the beginning. Resets

occur when you press/release the reset button, disconnect/reconnect power, or

when the Arduino receives insufficient power due to brownout.

3. If you add statements that make the piezospeaker play a tone at the beginning of

all your sketches, it’ll play a tone if a brownout occurs. That way, you can know

whether to replace the batteries or check for an error in your navigation code.

4. The

tone function.

5. A hertz is a measurement of the number of times per second a signal repeats

itself. It is abbreviated Hz.

Exercise Solutions

1. tone(4, 2000, 1500); //example, your tone may be different.

tone(4, 4000, 75); //example, your tone may be different.