Help w/ speaker for 16F690 and SOUND command

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  1. - 14th March 2009, 01:19 #1
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    Default Help w/ speaker for 16F690 and SOUND command

    I'm just trying to test the SOUND command with a 16F690. Unfortunately, I'm not getting any sound, but I'm pretty sure it's not on the sofware side of things, but the hardware side. The PICBASIC compiler manual shows a capacitor in series with a speaker. I input an alternating tone with the sound command where it should alternate tone/silence/tone/silence and I hear a faint "clicking" sound so I think it's trying to work.

    Does anyone have experience with more specifics as to the speaker/capacitor arrangement that would work.

    I also tried to directly drive a piezo element I had in an old parts bin, but that didn't work either.

    TIA

    Brad
  2. - 14th March 2009, 01:50 #2
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    Have you connected the polarity of the speaker correctly?
    What do you see on that pin using oscilloscope?
    Make sure you have disable analog pin and chg it to digital output (if applicable).
  3. - 14th March 2009, 01:55 #3
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    Good thoughts, but speaker is connected correctly. Pin is outputting. I can see activity on an LED, but I don't have a scope to be able to verify that the output is oscillating at some frequency. My old HP scope died a couple years ago and I never had a need to replace it.
  4. - 14th March 2009, 04:41 #4
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    It will not work without the capacitor. The book says and I concur 10µf.
    Last edited by Archangel; - 14th March 2009 at 04:43.
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  5. - 15th March 2009, 20:54 #5
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    Code:
    sound portB.6, [120,20]
    keep first number below 125, second number is duration. If you are using the Microchip low pin count demo board, be advised the black plastic header does not necessarily go to the pins they appear to.
    If you do not believe in MAGIC, Consider how currency has value simply by printing it, and is then traded for real assets.
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  6. - 20th March 2009, 18:57 #6
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    I removed the sound command from my main program just so I could focus on that. The only line of code I have now is:

    sound portc.0, [100,100]

    the LED tied to portc.0 lights up, but all I get is an initial click from the speaker. I've tried 6-10 different capacitors and that doesn't help either.

    Anyone have any other thoughts? I've tried changing the tone from 1 to 127 and no change. When I use one of the "white noise" tones, say 157, then I do see the LED flicker and the speaker crackles with the LED flicker.

    I wish I had a scope, but I don't.

    Any other thoughts?
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