Square Wave Frequency Conversion

randyrw

What would be the best way to use the Stamp to output square wave frequencies?
I want to read a square wave frequency ranging from 0-5Khz and output it with a varible offset based on a percentage. Example:· 2500hz in and x10% out. I'm new at this so bare with me.

thanks
Randy

Post Edited By Moderator (Chris Savage (Parallax)) : 3/3/2006 4:08:55 AM GMT

Piper984

Hi Randy,

You might already know this, but incase you don't: You can use the PULSIN command twice to do frequency counting (crossing zero) of your input sigal. I think you could use the FREQOUT command and an opamp to square up an output signal. Let us know what you end up doing, as I am sure it would be of interest to folks.

randyrw

Thanks for the info. Although I'm not sure how to do the PULSIN twice for freq counting. Could you give me a simple program command example?
thanks
Randy

Jon Williams

Randy,

Do you want to measure square waves (easy) or produce them (not so easy)?

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Jon Williams
Applications Engineer, Parallax

randyrw

I need to measure them, then offset the frequency by a varable amount, then produce them on a output. They will probably be pulses not perfect square wave.
thanks

Jon Williams

The measurement is easy (you could use PULSIN or COUNT), the production of a square-wave is not going to be easy in [noparse][[/noparse]interpreted] PBASIC. This may be something better suited for the SX micro using assembly language.

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Jon Williams
Applications Engineer, Parallax