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V2013.14

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  1. V2013.14

  2. Agenda • Old Business • Executive Committee • LCCUG meeting volunteer(s) • Reward Points Program • New Business • Weekly Quiz • Updated Website • Raspberry Pi Sensor Project • Intro to Python • LED

  3. Executive Committee • President • Name • Vice President • Name • Communications Director • Name • Treasurer • Name • Term begins next school year

  4. Lorain County Computer User Group • Website: www.lccug.com • Established around 1990 • The majority of their members are retired • Have a variety of knowledge and skills • June 10th Meeting: 6:00 – 7:30PM • Present on a topic of our choice • Volunteers?

  5. Avon Library Explorers Program • June 24th at the Avon Public Library • Mini Explorers (Pre K - Kindergarten) • 12:30-1:30 PM • Explorers (1st - 5th Grade) • 2:00 -3:00 PM • Theme is “Fun with Robotics” • Game/activity/experiment that will be engaging, but not too advanced for respective age groups • Any kid-friendly games or activities that we want to develop would be perfect No longer needed

  6. Weekly Quiz • What command should you use to immediately & gracefully shutdown and halt the Raspberry Pi? • sudo shutdown –h now • What command would you use to find the amount of free memory? • free -h • Which command shows a list of commands you recently typed? • history • What command would you use to reconfigure the Raspberry Pi? • sudoraspi-config • What Raspberry Pi feature will we use to communicate with off-board sensors? • GPIO • No perfect scores!

  7. Reward Points Program • Earn reward points for: • Completing surveys, polls, etc. • Completing weekly tasks • Completing projects • Participate during meetings • Volunteer opportunities • Redeem points for: • Tech Club gear • Other prizes • Create reward levels

  8. Raspberry Pi Sensor Project • Goals for today: • Editors • Intro to Python • Connect LED

  9. Getting Started: Editors • nano • IDLE • Geany

  10. Our First Python Program • Create the hellopi.py file using nano as follows: nano -c hellopi.py • Within our hellopi.py file, add the following code: #!/usr/bin/python #hellopi.py print ("Hello Raspberry Pi") • When done, save and exit (Ctrl + X, Y, and Enter) • To run the file, use the following command: python hellopi.py

  11. Challenges for Reward Points • Change “Hello Raspberry Pi” text to red • Show CPU speed or Temperature • Add ‘LED on/LED off’ to blink code • Have the on/off message coincide with LED • See website code samples for guidance

  12. Using GPIO: Raspberry Pi Pinout

  13. Using GPIO: Power a LED Resistor connects between Ground and LED cathode (short lead) Connect jumper from 3.3v to LED anode (long lead) Connect black wire to Ground, pin 6 Connect red wire to 3.3v, pin 1

  14. Using GPIO: Code to Blink LED #!/usr/bin/env python # Must be run as root: sudo python blink11led.py # Import necessary modules # Provides various time-related functions import time # Control Raspberry Pi GPIO channels import RPi.GPIO as GPIO

  15. Using GPIO: Code to Blink LED # Blinking function, turns LED on/off defblink(pin): # Turn LED on GPIO.output(pin, GPIO.HIGH) # Pause for 1 second time.sleep(1) # Turn LED off GPIO.output(pin, GPIO.LOW) # Pause for 1 second time.sleep(1) return

  16. Using GPIO: Code to Blink LED # Use Raspberry Pi board pin numbers GPIO.setmode(GPIO.BOARD) # Set the output channel/pin GPIO.setup(11, GPIO.OUT) # Blink LED 10 times for i in range(0,10): blink(11) # Reset any GPIO pins when you exit the program GPIO.cleanup()

  17. Using GPIO: Blinking LED Remove red wire Connect yellow wire from pin 11 to anode of LED (long lead)

  18. More Python Fun • Code samples: • Add colors to terminal • Get system information • See our webpage under ‘Raspberry Pi Workshop’ • Look for ‘additional Python examples to try!’

  19. Backup Slides

  20. How do Python Programs Run?