Now reboot the Pi and check the python code runs automatically. This will run the launcher script during startup. sh /home/pi/bbt/launcher.sh >/home/pi/logs/cronlog 2>&1 Once the crontab window opens add this line at the end of the file. We need to schedule the launcher script to run during startup itself. Navigate back to home directory and create a log directory there. sh launcher.shĬreate a log directory for capturing logs incase of any errors. You can test the launcher script by typing the following command if you want to test. We want to make this launcher.sh script executable. It will ask for filename leave it as ‘launcher.sh’ itself and press enter. Now press Ctrl – X and the press Y to Save. # navigate to home directory, then to this directory, then execute python script, then back home This shell script will navigate to the blink code. Copy and paste the following code to the editor. Open the terminal and navigate to the ‘blink’ folder by using the following command cd blinkĬreate a launcher script by typing the command in the terminal. If _name_ = '_main_': # Program start from hereĮxcept KeyboardInterrupt: # When 'Ctrl+C' is pressed, the child program destroy() will be executed. GPIO.output(LedPin, GPIO.HIGH) # Turn ON led tup(LedPin, GPIO.OUT) # Set LedPin's mode is output tmode(GPIO.BOARD) # Numbers GPIOs by physical location

Python code: blink.py import RPi.GPIO as GPIO

(The /home/pi/ is the default user files path). It should be inside the path /home/pi/blink. It is mostly used by Linux system Administrators to automate his daily tasks like scheduling backups and deleting old files, etc., Here we will be using it to launch the code during the startup, so we will be creating a shell script to navigate to the python code first and then launch it during startup using crontab.įirst, create a ‘ blink’ folder and then create an empty ‘ blink.py’ file.

Crontab (cron table) is scheduler used in Linux to schedule a specific task at a specific time. We need a scheduler to run the python code when the Pi is powered up or rebooted. Unlike Arduino, the Raspberry Pi won’t run the code until it is executed manually.

Auto run python code