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Author Topic: Arduino 5V to 12V CMOS Logic  (Read 736 times)
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I have a Aalborg stepper motor valve with a built-in control module that has a 0 - 5v Speed pin that I can control from my arduino uno, and a 12VDC CMOS Logic Direction pin that controls which direction the valve is opening or closing (0V or 12V respectively).  I'm having issues sending a 5V logic value from the arduino and converting it to a 12VDC CMOS Logic to control the direction.  I've tried using an NPN transistor and a Darlington transistor with no luck (emitter output is always 5V when high, collector voltage is 12V).  The Aalborg stepper motor valve runs on a 800mA, 12VDC power supply that I would like to tap into.  Any suggestions?
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http://digital.ni.com/public.nsf/allkb/826C981B3D0D3A9786256DD300188620
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