I have a problem with trying to set up multiple buttons. I followed this tutorial for 1 button and it worked perfectly:
The problem is that I have connected two more in the same way, whereby they are both connected to the same power and same ground, but different digital pins. The pins are 3, 4 and 5.
My problem is that when I press, say 3, both 4 and 5 are reading as if they have been pressed. This works for any combination - i.e. they are acting as if they are one giant button.
What do you think this could be? I hope this is not to vague. If this is the wrong way to do it, what should I think about?
Use a separate pulldown resistor for each button. The way you have it wired now, the side of the switches connected to the digital pins are all common, so when you close one switch all three digital pins are brought high (through that closed switch).
To see this problem on the schematic, re-draw it with the first switch closed. You can trace with your finger the current path from +5v to any of the three digital pins, so all three digital pins will see +5v.
