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Sound Sensor

by Sébastien Lelong last modified 2007-09-22 09:38
Author: Sébastien Lelong, The SirBot Project, 2007
Revision History
$Revision: 544 $ Initial creation
Abtract

This small board provides an easy way to record sound and transmit data to the mainboard's microcontroller. Recording is done using an electret microphone, amplified with a LM386 sound amp. op. Output can directly be wired to the analog-to-digital (ADC) pin of the microcontroller.

Space on the board has been optimized to provide a small board.

Electronic diagram

lm386_preamp_schematics.jpg

This diagram is closed to the one provided in the LM386 datasheet. C4 and C5 are used to stabilized power supply (this is what I've read...).

Electronic assembly

soundsensor_component_side.jpg

Component side. Hole on the bottom right can be used to fix the board.

soundsensor_solder_side.jpg

Solder side.

Results

adc_sound_sensor.jpg

Looks like...

localize_sensors.jpg

Two sound sensors can be used to localized sounds


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