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STM32mini MCU external clock method high-precision frequency capture [Copy link]

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The STM32 CONTEX M0 microcontroller uses an internal clock and an external crystal oscillator. The two clocks will differ by a few minutes a day.
TheSTM32CONTEXM0microcontrollerusesaninternalclockandanexternalcrystaloscillator
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Theproblemisthis:thesolenoidvalveiscontrolledonandoffbyaswitch,whichisconnectedinseriestoa24VswitchingpowersupplyAsimpleswitchcontrolstheopeningandclosingofthesolenoidvalveAflybackswitchingpowersupplyisconnectedtoreduce220Vto12Vtopowertheco ...
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