NameError: name 'GPIO' is not defined

[henkoegema]

• # http://www.rototron.info/using-a-motion ... pberry-pi/
  # Set up input pin
  GPIO.setup(21, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
  
  # Set up LED output
  GPIO.setup(20, GPIO.OUT)
  
  # Callback function to run when motion detected
  def motionSensor(channel):
  lcd.clear()
  GPIO.output(20, GPIO.LOW)
  if GPIO.input(21): # True = Rising
  global counter
  counter += 1
  lcd.message('Motion Detected\n{0}'.format(counter))
  GPIO.output(20, GPIO.HIGH)
  
  # add event listener on pin 21
  GPIO.add_event_detect(21, GPIO.BOTH, callback=motionSensor, bouncetime=300).
  counter = 0
  
  try:
  while True:
  sleep(1) # wait 1 second
  finally: # run on exit
  GPIO.cleanup() # clean up
  print "All cleaned up."

When I run this program I get following error message:

Code: Select all

pi@raspberrypi2:~/i2c_lcd20x4/motion $ sudo python motion.py
Traceback (most recent call last):
  File "motion.py", line 3, in <module>
    GPIO.setup(21, GPIO.IN, pull_up_down=GPIO.PUD_DOWN)
NameError: name 'GPIO' is not defined

[ghp]

Let your python program 'know' that you want to use the rpi.gpio package and add
import RPi.GPIO as GPIO
at the beginning of the program.
Hope this helps,
Gerhard

[PatrickPi]

Hello members,
I get RBP 3 B+., runing a very simple Py3 script to activate GPIO nevertheless received msg ... GPIO not defined..
Program had code import RPi.GPIO as GPIO as advice.
Pi software had upgraded as latest. and reboot Pi.
when run the moudle, still show the same message" .... GPIO not defined...
kindly advice what the problem can be? hope can get some advice, thank.
rg. Patrick

[pcmanbob]

Hello members,
I get RBP 3 B+., runing a very simple Py3 script to activate GPIO nevertheless received msg ... GPIO not defined..
Program had code import RPi.GPIO as GPIO as advice.
Pi software had upgraded as latest. and reboot Pi.
when run the moudle, still show the same message" .... GPIO not defined...
kindly advice what the problem can be? hope can get some advice, thank.
rg. Patrick

Hi.

Try posting your code so we can have a look at it, without seeing your code we don't have much of a chance to diagnose the problem,
might also be a good idea to post the actual error message as well.

please use code tags when posting your code

Add [code] at the top

code goes here

and [/code] at the bottom.