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You could use a 555 timer. They're only a few cents, available at even Radio Shack, and dont need programming. Just set it up to generate a square wave with adjustable frequency and duty cycle then you're all set.
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MII-12000 / Ampie / Lilliput 7" / BU-355 / PicoPSU / uSDC
Currently: Enjoying the setup, but always contemplating my next move...
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