GPIO: Warning Channel already in use

Question

gpio.py:5: RuntimeWarning: This channel is already in use, continuing anyway. Use GPIO.setwarnings(False) to disable warnings. GPIO.setup(8, GPIO.OUT) That is what I get after I run:

import RPi.GPIO as GPIO

GPIO.setmode(GPIO.BCM)
GPIO.setup(7, GPIO.OUT)
GPIO.setup(8, GPIO.OUT)
GPIO.output(7, 0)
GPIO.output(8, 0)

Is there anyway I can fix the warning?

Also, what does GPIO.cleanup() do? Should I use it? – LilVinny Sep 18 '16 at 16:40 — LilVinny, Sep 18 '16 at 16:40

score 24 · Accepted Answer · answered Jun 08 '17 at 20:55

24

This code helped me get rid of the warning (the "finally" part at the end):

import RPi.GPIO as GPIO
import time

GPIO.setmode(GPIO.BCM) # Broadcom pin-numbering scheme

GPIO.setup(6, GPIO.OUT) # output rf

# Initial state for LEDs:
print("Testing RF out, Press CTRL+C to exit")

try:
     print("set GIOP high")
     GPIO.output(6, GPIO.HIGH)
     time.sleep(5)               
except KeyboardInterrupt: # If CTRL+C is pressed, exit cleanly:
   print("Keyboard interrupt")

except:
   print("some error") 

finally:
   print("clean up") 
   GPIO.cleanup() # cleanup all GPIO

answered Jun 08 '17 at 20:55

user1231247

426
3
6

Please take the tour and visit the helpcenter to see how things work here. Note that empty except clauses are dangerous Use this with extreme caution, since it is easy to mask a real programming error in this way! – Ghanima Jun 08 '17 at 21:13
Wow, you actually took the time to review my code and help. Thanks! – LilVinny Jun 09 '17 at 00:11

score 5 · Answer 2 · answered Sep 18 '16 at 16:55

5

You can safely ignore the warning.

As the message says add GPIO.setwarnings(False) to the start of your script to disable warnings.

GPIO.cleanup() sets any GPIO you have used within RPi.GPIO to INPUT mode. If that behaviour is desirable call the method before exiting your script.

answered Sep 18 '16 at 16:55

joan

71,024
5
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Is there a way that I can repeat the script after every 5 minutes and after every loop turn the lights off. – LilVinny Sep 18 '16 at 17:01

score 0 · Answer 3 · edited Mar 09 '21 at 05:40

0

List item

import RPi.GPIO as GPIO 
from time import sleep
GPIO.setwarnings(False)
GPIO.setmode(GPIO.BOARD) 
GPIO.setup(7, GPIO.OUT) 
GPIO.setup(8, GPIO.IN)
state = "ON"
if GPIO.input(8) == 0: GPIO.output(7, GPIO.HIGH)
state = “OFF” 
print(state)
else:
GPIO.output(7, GPIO.LOW)
print(state)

edited Mar 09 '21 at 05:40

Greenonline

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answered Mar 08 '21 at 04:15

prinit reddy

1

2

Would you care to [edit] and explain your answer? – Greenonline Mar 09 '21 at 05:41

GPIO: Warning Channel already in use

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