Volume Control (for buzzer)

Other Hardware Audio
1

So I read somewhere that you can control a buzzer sounds with a pot (so I'm guessing you can control it with the resistance).
Here: How to Vary the Volume of a Buzzer

So I had this idea, I am suppose to make an up/down binary counter application and I'm thinking about making a volume control application with a buzzer and said counter.

The idea is quite simple I have 15 levels max for the volume. I'm planning on using the code in arduino named fading.

This one

/*
 Fading
 
 This example shows how to fade an LED using the analogWrite() function.
 
 The circuit:
 * LED attached from digital pin 9 to ground.
 
 Created 1 Nov 2008
 By David A. Mellis
 modified 30 Aug 2011
 By Tom Igoe
 
 http://arduino.cc/en/Tutorial/Fading
 
 This example code is in the public domain.
 
 */


int ledPin = 9;    // LED connected to digital pin 9

void setup()  { 
  // nothing happens in setup 
} 

void loop()  { 
  // fade in from min to max in increments of 5 points:
  for(int fadeValue = 0 ; fadeValue <= 255; fadeValue +=5) { 
    // sets the value (range from 0 to 255):
    analogWrite(ledPin, fadeValue);         
    // wait for 30 milliseconds to see the dimming effect    
    delay(30);                            
  } 

  // fade out from max to min in increments of 5 points:
  for(int fadeValue = 255 ; fadeValue >= 0; fadeValue -=5) { 
    // sets the value (range from 0 to 255):
    analogWrite(ledPin, fadeValue);         
    // wait for 30 milliseconds to see the dimming effect    
    delay(30);                            
  } 
}

except i change the LED with a buzzer will it still work? (I wonder)
as for the application of the up/down counter. I have my basic idea for it and I need to know if this code will work(If i exchange the LED with a buzzer).(I have no buzzer in hand right now and I will be able to acquire 1 next week but this experiment is due next week xD).

Will it work?

2

Why not try Tone instead of Fading? Maybe you can canibalise a small speaker out of an old radio or something if you have no buzzer.

3

JimboZA:
Why not try Tone instead of Fading? Maybe you can canibalise a small speaker out of an old radio or something if you have no buzzer.

This seems to change the tone of the sounds, and not change the volume? as for cannibalizing a small speaker, I would very much love to do that, so I will :smiley:

Thank you for the idea, I got it working :smiley: and now all i have to do is make my up/down counter and hook em up :smiley: and I'm done

4

The toneAC library can adjust the volume, Arduino Playground - toneAC Library
But you have to keep in mind that it is a PWM volume control. So the base frequency stays the same, but the higher frequency parts change if the volume is changed.
There are many other sound libraries, see the Playground 'sound' section, Arduino Playground - HomePage

5

JimboZA:
Why not try Tone instead of Fading? Maybe you can canibalise a small speaker out of an old radio or something if you have no buzzer.

you can totally do this, i recently salvaged a couple of 6 ohm speakers from an old computer stereo and both an electret microphone and a speaker from an old tuve pone, they work great for tone commands

6

you can totally do this, i recently salvaged a couple of 6 ohm speakers from an old computer stereo and both an electret microphone and a speaker from an old tuve pone, they work great for tone commands

Do NOT directly connect a 4-8 Ohm speaker! Or, do so "at your own risk".

The "absolute maximum" current from the ATmega chip is 40mA. From Ohm's Law we can calculate the minimum resistance/impedance as 125 Ohms (5V / 0.040). If you connect a speaker you should put a resistor in series (which will substantially reduce the volume) or you can use a transistor or MOSFET driver to boost the current (and optionally boost the voltage).

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