Pradeep Singh | 2nd Sep 2017
If you have installed piCore on your Raspberry Pi and are looking to control GPIO Pins using the python scripts, you can follow this article. Here, I am using a Raspberry Pi 3 and “piCore-9.0.3.zip” piCore image downloaded from this link – “http://distro.ibiblio.org/tinycorelinux/9.x/armv6/releases/RPi/“.
1. Install Packages:
1.1 Install Python using the following command –
tce-load -wi python3.5.tcz
If you want to use any other Python package use “tce-ab” command to search other “.tcz” files.
1.2 Install Python RPI.GPIO package using the following command –
tce-load -wi python-RPi.GPIO.tcz
2. Prepare the Circuit:
For this example you need, Raspberry Pi 2/3, a LED and a 330 or 220 Ohm Resistor.
Connect LED anode (+) with 330 Ohm (or 220 Ohm) resistor to Pin # 8 on Raspberry Pi 3 (GPIO # 14), and connect LED cathode (-) to Ground Pin # 6. For more details refer to the following picture –
3. Create a Python Script to Blink the LED:
To organize your python scripts create a dedicated directory under “/home/tc” using the following command –
Create a new Python Script in “python_scripts” directory with the following command –
Copy and Paste following code into “vi” editor window and save the file –
import RPi.GPIO as GPIO import time # Configure the PIN # 8 GPIO.setmode(GPIO.BOARD) GPIO.setup(8, GPIO.OUT) GPIO.setwarnings(False) # Blink Parameters blink_interval = .5 #Time interval in Seconds blink_Count = 10 # Blinker Loop for i in range(0,blink_Count): GPIO.output(8, True) time.sleep(blink_interval) GPIO.output(8, False) time.sleep(blink_interval) # Release Resources GPIO.cleanup()
4. Execute the Script to Blink the LED:
Execute the python script using the following command –
sudo python /home/tc/python_scripts/led_blinker.py
During the execution of this python script, You should see your LED blinking. if not, check the connections on your Raspberry Pi.
5. Make the Script Persistent:
If you reboot the Raspberry Pi, you would lose this python script. If you want to make it persistent, following these steps –
5.1 Use the following command to add the “python_scripts” directory in the list of file/directories that should be backed up by “filetool.sh” script –
sudo echo '/home/tc/python_scripts' >> /opt/.filetool.lst
5.2 (optional Step) If you want to trigger this script on system startup, add it to “bootlocal.sh” file using the following command –
sudo echo 'sudo python /home/tc/python_scripts/led_blinker.py' >> /opt/bootlocal.sh
5.3 Save the persistent data using the following command –
After this step, if you reboot your Raspberry Pi you should not lose the “led_blinker.py” script.