start PI camera on reboot

[bvimpe]

I searched and tried different ways to start a python script which starts the PIcamera on a raspberry PI3.

first attempt : through crontab

sudo crontab -e added :

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@reboot python3 /home/pi/camera.py

script :

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from picamera import PiCamera
    from time import sleep
    camera = PiCamera()
    camera.framerate = 15
    camera.start_preview()

second attempt through crontab :

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sudo crontab -e

added :

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@reboot /home/pi/launcher.sh >/home/pi/log/cameralog.log 2>&1

script camera.py stays the same
launcher.sh :

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 #!/bin/bash
    clear
    cd /
    cd home/pi
    /usr/bin/python3 /home/pi/camera.py
    cd /

third attempt :
removed all from crontab and used rc.local

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sudo nano /etc/rc.local

added :

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/usr/bin/python3 /home/pi/camera.py&

None of the above ways is starting the script at reboot.

I'm new to raspberry and python. what's wrong?

[kaksi]

I have solved a very similar problem this way:

in /etc/rc.local, I added:
sudo python /media/usb_1/WATCHDOG.PY &

(do not to forget the "&" at the end of the line and place it before the line with exit)

Via network, I create shut.r (in which case WATCHDOG restarts the PI) or shut.h (to shut it down properly).

I am a beginner, too. If someone knows a less complicated way, I will be gladful.

When the PI boots, camera starts with the line:
sudo python /media/usb_1/PI_CAM.PY
which I added as the last line in /etc/profile.

(I learned the hard way that programs launched from etc/profile can be stopped with CtrlC.)