I bought by mistake a bunch of push buttons that open the circuit (normally closed). They are the opposite of those used as reset button in Arduino, although they look identical.
Any idea of where I can use them (without auxiliary NOT gates, transistors etc, to invert their function)?
First thing that pops up into my mind is home automation (trigger alarm when window is open), but I am more interested in using them on the board.
Thanks.
Well they can still be used very well as normal user switches wired to digital input pins. Wire the switch to ground and the desired input pin. Enable the internal pull-up resistor. Push the switch and it will read as a HIGH and normally unpushed as a LOW.
Lefty
Thank you, makes sense. And because I have so many, I will think of making a matrix of buttons.
Now I just realize that I can even use them as the other type (like the reset button, with the pin hooked to Vcc through a 10k resistor), and I just need to modify the sketch. How could I be so narrow minded?