I am using a 3 pin PIR Sensor to detect motion (https://www.modmypi.com/pir-motion-sensor). This is connected to the GPIO pins. I also have the RPI Camera module attached to the Camera CSI. I would ultimately like the RPI to detect motion then take a picture. I can detect motion with a python script and I take a picture with a python script but when I combine the two, I can detect motion, but get an error when I try to take the picture. I need some help figuring out what the issue is. The camera has been enabled as proven by taking pictures in a separate python script.

Error Statement:

mmal: mmal_vc_component_enable: failed to enable component: ENOSPC
Traceback (most recent call last):
  File "motionsensor.py", line 17, in MOTION
    camera = picamera.PiCamera()
  File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 330, in __ini                                                                                        t__
  File "/usr/lib/python2.7/dist-packages/picamera/camera.py", line 441, in _init                                                                                        _camera
    prefix="Camera component couldn't be enabled")
  File "/usr/lib/python2.7/dist-packages/picamera/exc.py", line 127, in mmal_che                                                                                        ck
    raise PiCameraMMALError(status, prefix)
picamera.exc.PiCameraMMALError: Camera component couldn't be enabled: Out of res                                                                                        ources (other than memory)

My Code:

# coding: utf-8
import RPi.GPIO as GPIO
import picamera
import time




filename = 0


    print "Motion Detected!"
    camera = picamera.PiCamera()
    filename = 'image' + filenumber + '.jpg'
    filenumber = filenumber + 1

print "PIR Module Test (CTRL+C to exit)"


print "Ready"


    GPIO.add_event_detect(PIR_PIN, GPIO.RISING, callback=MOTION)

    while 1:


except KeyboardInterrupt:

    print " Quit"

2 Answers 2


You are defining the camera whenever there is motion. The second time the call back runs, the there is an error, because there is already a process controlling the camera. Define the camera outside of the function, and the code should run fine. If this doesn't work reboot and run it again.


Try rebooting, which'll clear your RAM

  • Rebooting is not a nice option.. The code needs to change as Jack Hughes said (or similar) but rebooting is masking the problem, not fixing it.
    – Luis Diaz
    Commented Sep 22, 2017 at 9:04

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