LEGO Mindstorms NxT 53788 Manuel de l'utilisateur - Page 23
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NXT TECHNOLOGY
SOUND SENSOR
The Sound Sensor makes your robot hear!
The Sound Sensor can detect both decibels (dB) and
adjusted decibels (dBA). A decibel is a measurement of
sound pressure.
dBA: In detecting adjusted decibels, the sensitivity of
the sensor is adapted to the sensitivity of the human
ear. In other words, these are sounds that your ears are
able to hear.
dB: In detecting standard (unadjusted) decibels, all
sounds are measured with equal sensitivity. Thus, these
sounds may include some that are too high or low for the human ear to hear.
The Sound Sensor can measure sound pressure levels up to 90 dB - about the level
of a lawnmower. Sound pressure levels are extremely complicated, so the Sound
Sensor readings on the MINDSTORMS
comparative examples: 4-5% is like a silent living room. 5-10% would be the reading
you get from someone talking some distance away. 10-30 % is normal conversation
close to the sensor or music played at a normal level. And you will record readings of
30-100% from people shouting and music played at high volumes.
Test it!
Test the Sound Sensor's ability to read
sound volume:
Connect the Sound Sensor to the NXT.
1
Select the View submenu on the
NXT's display. Select the Sound
Sensor icon and the port where you
have connected the sensor.
Select the Try Me submenu on the NXT's display and test
your Sound Sensor. You'll get a fun reaction.
®
NXT are displayed in percent (%). To give some
2
Make some sounds into the Sound Sensor and watch the readings
displayed on the NXT. Use the sensor to read some sounds around you.
How loud do your parents speak? How loud is your front doorbell?
Suggestions for use
You can use the Sound Sensor to make
a sound controlled robot. Talk to your
robot and it will answer you back. Clap
your hands and the robot can pick up
things and bring them to you.
3
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