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How to detect a sound? what electronic components ?

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young707082

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How To Detect A Sound?

Basically what electronic component surppose to use to detect a sound? Mean how to differentiate a different types of frequencies or certain level of decibel (dB)? And how does the simple circuit diagram looks like? Thank you!
 

Re: How To Detect A Sound?

It's not the same, if you just want to detect a certain level in dB you just need a mic and a operational amplifier, or a circuit with transistors.
If you whant to detect a certain level, in a certain frecuency, you need the same circuit as before, but with a bandpass filter tuned to the frecuency you want to measure.
You can use a mic preamp to detect a certain level, and try to adjust it to your needs.
For the bandpass filter you can look for a equalizer, and try to adjust it to your needs.

Regards,
Diego Bouvier
 

How To Detect A Sound?

I'm totally fresh in electronics...Deeply appreciated for your help.

PIC microcontroller decide to use: PIC16F877A. Compiler: MPLAB
(Is PIC16F877A suitable for this kind of project?)

Objective:
Light up an LED & activate the DC motor if the sound level is above a certain dB (Need to differentiate at lease 2 different level of dB).
(Only use 1pc. of PIC16F877A without any other IC, is it feasible?)

Draft Flow Chart:
Microphone---> Amplifier--->LED/ DC Motor

Somebody can find me a similar schematic diagram?
 

Re: How To Detect A Sound?

your hardware flow will be like

Microphone -> Opamp as comparator (level 1) -> to PIC -> LED and Motor
Microphone -> Opamp as comparator (level 2) -> to PIC -> LED and Motor

in software part look continuously for the two pins or you can set the two pins for external interrupt
when you get a pulse do the job


for setting different level of dB detection use a trimmer with opamp and set them at different values
 

A single chip is good enough... But you will not even need a micro controller...!!! Your application can be achieved just by using a hand full of discrete components.
 

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