Robotics with the Boe-Bot text v2.2

Chapter 2: Your Boe-Bot’s Servo Motors · Page 45
' Robotics with the Boe-Bot - HelloOnceEverySecond.bs2
' Display a message once every second.
' {$STAMP BS2}
' {$PBASIC 2.5}
DO
DEBUG "Hello!", CR
PAUSE 1000
LOOP
Your Turn – A Different Message
You can modify your program so that part of it executes once, and another part executes
over an over again.
√ Modify the program so that the commands look like this:
DEBUG "Hello!"
DO
DEBUG "!"
PAUSE 1000
LOOP
√ Run it and see what happens! Did you anticipate the result?
ACTIVITY #2: TRACKING TIME AND REPEATING ACTIONS WITH A
CIRCUIT
In this activity, you will build circuits that emit light that will allow you to “see” the kind
of signals that are used to control the Boe-Bot’s servo motors.
What’s a Microcontroller? Excerpts – This activity contains selected excerpts from the
What’s a Microcontroller? Student Guide v2.0.
√ Even if you are familiar with this material from What’s a Microcontroller?, don’t skip
this activity.
In the second half of this activity, you will examine the signals that control your servos and
timing diagrams in a different light than they were presented in What’s a Microcontroller?
Introducing the LED and Resistor
A resistor is a component that ‘resists’ the flow of electricity. This flow of electricity is
called current. Each resistor has a value that tells how strongly it resists current flow.