BS2e Sounds and Siren

rfenergy

Has anyone tried to use the freqout command to cause a BS2e to emulate the sound of a siren? I don't know enough about the command and its advanced parameters to get it to mnake a smooth transition between the frequencies. If anyone has any sample code os BS2e sirens or sound effects PLEASE post them so I can stop pulling my hair out!!

Mike.

Jon Williams

It's very difficult to make a smooth transition because each new FREQOUT takes a bit of time to load an this lets the output relax. What this means is there will always be a clicking sound unless you synthesize the sound via some other method.

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Jon Williams
Applications Engineer, Parallax

doggiedoc

Would it be possible to generate the siren sound with discrete components and control that start/stop with the stamp?

I seem to remember a schematic in one of my basic electronics texts somewhere. I'll have to look that up.

Jon Williams

Sure, you could do that -- use a 555 (or 556) and let the BASIC Stamp control the reset pin.

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Jon Williams
Applications Engineer, Parallax

rfenergy

Thanks for the information guys. That makes sense about the lag in the transition time. I'll explore the alternative of using some ancillary circuitry. Thanks again for responding.

doggiedoc

I found that schematic. Credit goes to Forrest M. Mims III, from the Basic Electronics Workbook.

Hope this helps.








I don't know what application you have in mind, but if you were to use the stamp to monitor whatever, say a perimeter trip-wire or tank fluid level. You probable could have it sound the "alarm" in the above circuit.

Post Edited (doggiedoc) : 8/24/2005 8:19:54 PM GMT