Hi,
I want to build an audible tone generator with knobs or buttons for selecting the frequency, and perhaps a display to show the current frequency.
I have some brief experience with arduino and amtels so I know some of what I will need but could use some advice in a few areas. I've basically broken it down into the following pieces:
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tone generation. It looks like there is a sample program that can output tones rather easily, so I think I'm ok on this part. I was looking at the toneMelody example and it looks like I can output a given frequency pretty easily
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The speaker. the toneMelody specifies an 8 ohm speaker. Can I get one of these at radio shack? I want to be able to produce tones as low as 20Hz. Would that be an issue?
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Amplification. Later, I want to drive something bigger. Can I just plugin into an 'line in' where my 8 ohm speaker was and use a stereo? In general, how do I control speaker volume in the case where I am not outputting to my stereo?
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control + display
I could go several routes with this one. If I have analog control, like a knob, I want to be able to display the actual frequency on an LCD. OR, I could have digital buttons to control frequency and display the number on an LCD. Any advice here? a button for up and a button for down connected to the lcd, and then just read out that value for input into the tone generator? Is radio shack a good place for getting little knobs?
Anything I am missing?
Thanks in advance,
Cliff