Hello,
I have a question.
How the programables switchs works?
Having a look at the schematics, I wonder how the programmables switch works (specially the SW3). Because eathier th SW3 relies PMW2 with GND ... or eathier withh... Nothing?
Does he needs to be connevted to 3.3V.. so the Arduino can read eathier a 3.3V or eathier a 0V? Or that is just for analog inputs?
Regarding the hardware design of the programmable one (SW3 which is connected to PWM2), the Arduino Due board has an internal pull-up resistor, so when the pull-up is enabled, it will be in "high" level by default and when you connect it to ground it goes to "low" level.
So the "nothing" you mentioned is the internal pull-up, to configure it
check this topic.
