V2013.14
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
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Executive Committee
• President
– Name
• Vice President
– Name
• Communications Director
– Name
• Treasurer
– Name
• Term begins next school year
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Lorain County Computer User Group
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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?
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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
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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?
– sudo raspi-config
• What Raspberry Pi feature will we use to communicate with offboard sensors?
– GPIO
• No perfect scores!
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Reward Points Program
• Earn reward points for:
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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
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Raspberry Pi Sensor Project
• Goals for today:
– Editors
– Intro to Python
– Connect LED
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Getting Started: Editors
• nano
• IDLE
• Geany
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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
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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
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Using GPIO: Raspberry Pi Pinout
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Using GPIO: Power a LED
1.
2.
3.
4.
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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
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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
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Using GPIO: Code to Blink LED
# Blinking function, turns LED on/off
def blink(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
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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()
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Using GPIO: Blinking LED
1.
2.
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Remove red wire
Connect yellow wire from pin 11 to anode
of LED (long lead)
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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!’
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Backup Slides
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How do Python Programs Run?
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