I am working on a project where I am working with an existing circuit board, and there is a button that I want to be able to send a signal to even when the button is not pushed, so that the circuit thinks the button was pushed. Unfortunately, the button is active low, so I am not sure if there is a way to drive the voltage of the button across its leads to low. If there is some way to do that with an Arduino, any help would be greatly appreciated.
You want to fake a button press using an Arduino. If so, use a transitor over the button (emitter to ground, collector to the button pin that carries the signal). Connect the base of the transistor through a resistor to an Arduino pin that you set as output and control. Not sure of the resistor value (1 kOhm will probably do).
And you will have to connect the other board's ground to Arduino's GND, if that is a problem you will need an opto coupler.
Hi,
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What is the button part of?
Tom... 