i have an lcd hooked up to my arduino uno, it is using the 5v on the arduino, i am trying to hook up a button and i need to use the 3.3v on the arduino, but whenever i put the other ground that i need for the button in, the lcd stops working. i could take out the 3.3v pin and the ground pin would still make the lcd stop working. if i put ether one of them on an external power source they don't work. any solutions.
the image wont upload correctly but here is the diagram url: