51-09795.pdf

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ACTIVITY
2
SECTION 4
Copymaster for use with 9795
INTERMEDIATE AND
ADVANCED IDEAS USING
PROGRAMMER INVENTOR
The Burglar Alarm 2
You are going to create a burglar alarm that uses sound, light and a
motorized “scarecrow” to scare away a burglar.
Add the light sensor to the house as shown on page 11 of the Building Booklet.
Make sure the lamp is connected to port A and the light sensor is connected
to port 1.
Load the ROBOLAB software and choose Inventor 3.
Create a program that turns on the light and makes some sounds when the
light sensor is activated.Also add the movement of the motorized scarecrow
you created in the first Burglar Alarm activity.You can use the Jump and Land
icons to make the program run continuously.
Download the program and run it.
Try to sneak the LEGO figure through the door past the light sensor. Does
your burglar alarm work? If not, check the light sensor reading as the LEGO
figure is in front of the light sensor and compare it to the light sensor setting
in your program.
For a more dramatic burglar alarm, use the Loop icons
to make the sound and lamp turn on more than once. Create a loop that
runs inside the Jump and Land structure.
Download the program with the loop and try it.
What do you think? Is it a better burglar alarm? The Loop runs twice as a
default but you can modify the command to run many more times.
Finally, use the Piano Player to create a more elaborate sound for your
burglar alarm. (See a description in the Doorbell activity). Change to
Inventor 4.Then choose Piano Player from the Project menu so you can
record a scroll of your own!
Use micromotor pieces
for your scarecrow.