I made an 4x4x4 led cube with 4 layer connecting to the A0 A1 A2 A3 pin of the arduino uno and then the 16 columns connecting to the A4 A5 1 2 3 4 5 6 7 8 9 10 11 12 13 pins. I havent use any resistors. I have a little question if i turn all leds on through the arduino the ampèrage is way to high so i want to put in some transistors but i am new to this so a little help could come in handy. I've read a great deal about it but still i want some help of people who have experience and an answer to my question soo. What can i put a transistor before every layer pin? So 4 in total? What kind of transistors do i need and how do i connect them to the cube and arduino? Btw i use 5mm blue led they need to have aboit 2.7v to shine bright. I hope to find some answers. Thanks in advance.
Ps. If you need to know anything else i am will give the information you need.