Automotive Use

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  1. - 20th August 2006, 10:04 #12
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    BigWumpus
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    Quote Originally Posted by DynamoBen
    Is this the "proper" way of sensing the state of a 12V source?

    I have also seen voltage dividers or transistors used. Whats the best method for a 12V sense? (just detecting on (0V) or off (12V))
    The last 3000-4000 parts we have sold have a relais to switch the power after switching the ignition. Before, there are sometimes little voltage on the pin.

    In our current design, I use a zener-diode (5,1V) followed by a 4k7-resistor towards griund and a 100k-resistor to the port.

    My intention was to reject all this little voltages on the ignition-power-line comind from other devices...
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