Hi all,
I have a task that i would like to start automatically on boot up of my RPi 4. I have some Python code that streams radio spectrum data from a software defined radio. Incorporated into the code is the use of a tool called 'soapy_power'. This was installed using pip install, along with other dependencies. I'm streaming my data onto a USB stick, so that also needs to be mounted prior to the code starting. My code works fine when i run it from a terminal and I have also created a sh script that would firstly mount the USB stick, then start the code. If i run this from a terminal it works ok as well. So far, so good.
As mentioned above i'd like this to run automatically on boot up, so I can just plug it in and leave it running for a few days to capture some data. So, i started looking at crontab. I've tried 'sudo crontab -e' and 'crontab -e' , both with the same response. The sh script i use is as follows:
The command i used in crontab is:
Although the sh script runs ok, when i try it from the terminal, i have no luck running this on reboot. Well, that's not strictly true, the USB stick mounts ok, and the Python code starts, but it throws up an error in the cronlog that soapy_power is not installed and stops running.
I suspect that this is something to do with where soapy_power is installed (pip install vs sudo pip install, i chose the former), and whether i use python sdr_streaming.py vs sudo python sdr_streaming.py. However, i've tried various options and still get the same result.
Does crontab have a restriction with running code as a pi user or running it from the root directory? Is crontab the best option for this, or what other option would be best? Any suggestions most welcome.
Thanks
Dave
I have a task that i would like to start automatically on boot up of my RPi 4. I have some Python code that streams radio spectrum data from a software defined radio. Incorporated into the code is the use of a tool called 'soapy_power'. This was installed using pip install, along with other dependencies. I'm streaming my data onto a USB stick, so that also needs to be mounted prior to the code starting. My code works fine when i run it from a terminal and I have also created a sh script that would firstly mount the USB stick, then start the code. If i run this from a terminal it works ok as well. So far, so good.
As mentioned above i'd like this to run automatically on boot up, so I can just plug it in and leave it running for a few days to capture some data. So, i started looking at crontab. I've tried 'sudo crontab -e' and 'crontab -e' , both with the same response. The sh script i use is as follows:
Code:
#!/bin/sh# Mount USB drive, navigate to home directory, then execute Python codesudo mount /dev/sda1 /mnt/usb -o uid=pi,gid=piecho "USB drive mounted successfully"cd /cd /home/pi/SDR-streaming/code#Start streaming codepython sdr_streaming.pyCode:
@reboot sh /home/pi/SDR-streaming/code/launch-stream.sh > /home/pi/SDR-streaming/logs/cronlog 2>&1I suspect that this is something to do with where soapy_power is installed (pip install vs sudo pip install, i chose the former), and whether i use python sdr_streaming.py vs sudo python sdr_streaming.py. However, i've tried various options and still get the same result.
Does crontab have a restriction with running code as a pi user or running it from the root directory? Is crontab the best option for this, or what other option would be best? Any suggestions most welcome.
Thanks
Dave
Statistics: Posted by cappers — Thu Jan 18, 2024 10:52 am