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Hi, I have my Systems & Control exam tomorrow and I really need some help. I need to know how to draw logic diagrams but I have no idea how to do this. For example, a question on a past paper says that a motor in a car won't start unless the seat belt is fastened, the door is closed and a secret security switch is pressed.
These are the logic states of the sensors:
Input A Seat belt fastened = Logic 1
Input B Door closed = Logic 0
Input C Secret switch pressed = Logic 1
Output Q Drives relay which allows the motor to start the engine when the ignition is turned.

There is then a diagram which looks a bit like this

A--

B--

C--

And you have to complete the diagram. Can anyone explain the whole logic thing or give me a link to somewhere as its really important. Thanks!
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