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I've got an ArduiMU V3+ and would like to connect an ordinary push button to it. How would I connect it to it.

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Presumably connect it between ground and an unused input, then activate a pullup resistor on the input. This really depends on the software you are running, and on any unique requirements of your application (such as acceptability of various types of failure). –  Chris Stratton Jun 14 at 17:00
    
May I use analog-inputs as well? –  Hedge Jun 14 at 17:48
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This site realy exists as a fallback for things which are not covered in or not clear in the documentation, not as an alterantive to it. Please start with arduino.cc/en/Tutorial/AnalogInputPins –  Chris Stratton Jun 14 at 17:52

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