I am the RPi B+ user. Feeling confused about the GPIO. GPIO isn't working. I tried checking it with multimeter by connecting the pin 21 to the gnd, not work. And then i tried the 5 v and 3.3 v, it works. Any idea about this problem. I am working a project using RPi. So i need to solve it immidiately. I am a newbie abou RPi.
import RPi.GPIO as GPIO
from time import sleep
Anyway GPIO 21 in the seventh left gpio?? Need Help!! Thanks