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Sound Sensor
Technology
View
Test the Sound Sensor’s ability to measure sound volume
using View [View]. Connect the Sound Sensor to NXT port 2.
Make sounds into the microphone (Sound Sensor) and see the
readings on the NXT. Try also to read the sounds around you:
How loud are the nearest voices?
Suggestions for use
You can add the Sound Sensor to an NXT model and then
program the model behavior to change when the Sound
Sensor is activated.
Programming ideas using the Sound Sensor are included in
the Robot Educator.
Select View [View] in the NXT display.
Select the Sound dB icon.
Select port 2.
The Sound Sensor detects the decibel level: the softness or
loudness of a sound. The Sound Sensor detects both dB and
dBA.
dBA: the sounds human ears are able to hear.
dB: all actual sound, including sounds 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 sensor
readings on the LEGO
®
MINDSTORMS
®
NXT are displayed in
the percentage [%] of sound the sensor is capable of reading.
For comparison, 4-5% is like a silent living room and 5-10%
is about the level of someone talking some distance away.
From 10-30% is normal conversation close to the sensor or
music played at a normal level and 30-100% represents a
range from people shouting to music playing at high volumes.
These ranges are assuming a distance of about 1 meter
between the sound source and the sound sensor.
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