Artonn:
I have some 220K and 220E resistors but not any 220R resistors.What is an IO ?
220R is 220 Ohms Resistance abbreviation. you can add resistances by wiring them in serial. 2 100 ohm resistors in line is close enough to 220R for this to work.
IO is an Input-Output pin. The pins you setMode() as OUTPUT, INPUT or INPUT_PULLUP as opposed to 5V, GND, 3V3, reset, and the clock pins. 3V3 is 3.3V and in case you're wondering, I didn't make this up!