Let's Make Robots!

how is this possible without an hbridge or similar?

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As long as the servo doesn't pull more current than the powersupply/voltage regulator/battery pack can supply, you won't have any problems driving a servo directly from pretty any* microcontroller.

*NOTE: I say any with a note, because, I don't know of any micro that would have a problem driving a servo directly. Just because I don't know of one, doesn't mean there isn't one out there that can not drive a servo directly. It probably would not be very useful to robotics.

i made the incorrect that servos and motors operated similarly....now I understand, thanks.