SOUND command not working

I'm trying to generate a tone whenever a specific event occurs using the code:

Code:

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SOUND PortA.1, [127, 255]

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I have tried this code with both a speaker (with and without 22 uf capacitor) and two different piezo-speakers and neither has produced a tone. When I run the program I hear a "click" coming from the speaker, but then silence. I have changed the code for this program to:

Code:

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main:
sound PortA.1, [127, 255]
goto main

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But I still only hear a click. I have defined OSC as 20 (PIC 18F252) but still nothing is generating a tone. I even tried:

Code:

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main:
high PortA.1
pauseus 30
low PortA.1
pauseus 30
goto main

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But that also made a clicking noise, no tone. Shouldn't this work?

Are you sending the signal to an amplifier before it gets to the speaker? If not, what type of speaker do you have?

1. Make sure PortA is configured as Digital I/O. The sound command will not work if it's configured as AtoD inputs.

2. Try another frequency, 127 is the highest (10KHz). Try something lower.

3. Try another pin on another Port (PortB maybe).

4. Test the speaker(s) by putting another sound trough them (like a radio). Just to make SURE they work.

Jim

I think I figured it out. I was sending inaudible stuff. The frequency was way to high. I changed the pauseus to 500 and got a nice tone.