1. Embedded Software Development with Python and the Raspberry Pi
Class 4: Controlling Raspberry Pi Peripherals with Python
August 21, 2014 Jacob Beningo, CSDP
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2. Course Overview Introduction to Python Python Fundamentals
An Overview of the Raspberry Pi
Controlling Raspberry Pi Peripherals with Python
An Internet of Things Weather Station Example

3. Session Overview Controlling Raspberry Pi Peripherals with Python
The Raspberry Pi Ecosystem
Library Setup
GPIO Setup and Example
I2C
UART
SPI
Analog Sensors
Pi Camera

4. Ecosystem

5. Library Setup Python Raspberry Pi Libraries Installation Steps
Provide code modules to easily access hardware
Easy to Install
Installation Steps
Update Packages
Install GPIO Library
Install git
Install optional Adafruit Python Libraries

6. Library Setup – Update Packages
sudo apt-get update

7. Library Setup – Install Python 2.7
sudo apt-get install python-dev

8. Library Setup – Install GPIO
sudo apt-get install python-rpi.gpio

9. Library Setup - Optional
Adafruit Libraries
Useful interfaces for experimentation
Install git
sudo apt-get install git
Clone Adafruit repository
git clone
cd Adafruit-Raspberry-Pi-Python-Code ls

10. Library Setup - Optional

11. A GPIO Example Goals Setup Toggle an LED using Python
Adjustable blink rate
Use of ctrl-c to exit application
Setup
Use nano
GPIO18 as an output
Use python sleep()

12. A GPIO Example

13. Setting Up I2C Add I2C modules sudo nano /etc/modules
Don’t forget to reboot after this step!
sudo reboot

14. Setting Up I2C Install I2C tools
sudo apt-get install python-smbus
sudo apt-get install i2c-tools
Modify /etc/modprobe.d/raspi-blacklist.conf
Don’t forget to restart after saving
sudo reboot

15. Setting Up I2C
sudo i2cdetect –y 1

16. Setting Up the UART
UART0 by default is setup for Kernel Debugging

17. Setting Up the UART Run the UART Script Steps
Disconnects the UART from Kernel
Steps
sudo wget -O /usr/bin/rpi-serial-console && sudo chmod +x /usr/bin/rpi-serial-console
rpi-serial-console status
Rpi-serial-console disable
sudo reboot
The script modifies the entries for ttyAMA0 in
/boot/cmdline.txt
/etc/inittab

18. Setting Up the UART Install python-serial
Most likely already installed and up to date
sudo apt-get install python-serial

19. Setting Up SPI Install Spi Wrapper mkdir python-spi cd python-spi
wget
wget
sudo python setup.py install

20. Setting Up SPI

21. Reading Analog Sensors
Model:
A / B / B+
Model:
B+ Only

22. Reading Analog Sensors
MCP3008 ADC Chip

23. Pi Camera
Enable Camera
Sudo raspi-config
Reboot
Python Test Script

24. Going Further Download Template Materials for Web Tutorials YouTube
Python Doxygen Script Template
Personal Weather Station Python Script
Raspberry Pi Example Python Scripts
Web Tutorials
YouTube
From under
Blog and Articles > Software Techniques > Embedded Software with Python

25. Contact Information
P.O. Box 400
Linden, Michigan 48451 : :
: Jacob_Beningo
: Beningo Engineering
: JacobBeningo
: Embedded Basics
Jacob Beningo
Principal Consultant
© All Images and content in this presentation may not be used or copied without express written permission of the owner.