IoT with Intel Galileo Gerardo Carmona. makerobots.tk

Transcription

1 IoT with Intel Galileo Gerardo Carmona

2 Outline What is Intel Galileo? Hello world! In Arduino Arduino and Linux Linux via SSH Playing around in Linux Programming flexibility How GPIOs works Challenge 1: Bash script

3 What is Intel Galileo?

4 Intel Galileo The Intel Galileo Gen 2 development board is a microcontroller board based on the Intel Quark SoC X1000 application processor, a 32-bit Intel Pentium brand system on a chip (SoC). It is the first board based on Intel architecture designed to be hardware and software pin-compatible with shields designed for the Arduino Uno* R3. This platform provides the ease of Intel architecture development through support for the Microsoft Windows*, Mac OS*, and Linux* host operating systems. It also brings the simplicity of the Arduino integrated development environment (IDE) software. From Intel website, Galileo overview

5 Intel Galileo Intel Galileo Gen 2 Intel Galileo Gen 1

6 Intel Galileo Gen 1 RS-232 USB client USB Host Ethernet Pin 13 LED 5 V input Micro SD slot SD card LED, power LED and Reset button Digital pins, some PWM, Serial, I2C and others Quark SoC X1000 RAM memory Power pins & analog pins Reboot

7 Intel Galileo Gen 2 USB device port USB host port Pin 13 LED, Power LED and SD card LED Ethernet port 6 pin FTDI header 7 to 15 V input Digital pins, some PWM, Serial, I2C and others RAM memory Micro SD Card slot Reboot Linux button Quark SoC X1000 Power pins & analog pins Reset button (sketch)

8 Hello world! In Arduino

9 Hello World! - Arduino Before we can program our Intel Galileo board we need to do some setup steps, like installing drivers, software, etc. Refer to Installing Intel Galileo.pdf in my webpage for more details.

10 Hello World! - Arduino Open Arduino IDE. Open file under: File >> Examples >> 01.Basics >> Blink menú Go to menu Tools >> Boards >> Galileo Gen 2 Then Tools >> Serial port >> COMx and select corresponding COM port for your Galielo. If you do not know which one it is, go to Device manager and look under COM and LTP ports. Compile, Upload, New, Open, Save

11 Hello World! - Arduino Code: void setup() { // initialize digital pin 13 as an output. pinmode(13, OUTPUT); } // the loop function runs over and over again forever void loop() { digitalwrite(13, HIGH); // turn the LED on (HIGH is the voltage level) delay(1000); // wait for a second digitalwrite(13, LOW); // turn the LED off by making the voltage LOW delay(1000); // wait for a second }

12 Arduino + Linux

13 Arduino + Linux You can combine the easy to use of Arduino and the power of an Operative System like Linux. From the Arduino code you can make system calls to the Linux side using system command. Example: system( ls > /dev/ttygs0 ); System command List of directories Redirect output to Serial port

14 Arduino + Linux What if I want to know my Galielo s IP address?

15 Arduino + Linux What if I want to know my Galielo s IP address? R: Using ifconfig. upload this program void setup() { // Init serial com Serial.begin(9600); // Waits 5 seconds before printing it delay(5000); // Gets network interface info and sends // it through the serial interface system("ifconfig > /dev/ttygs0"); } void loop() { }

16 Arduino + Linux

17 Linux via SSH

18 Linux via SSH Secure Shell is a encrypted network protocol that initializes sessions on remote machines. We can connect to our Intel Galileo Linux-side using SSH. Follow the next steps (windows): 1) Connect your Intel Galileo to your local network 2) Get PuTTy o r any other SSH client, for PuTTY go to:

19 Linux via SSH Open PuTTy and configure as shown 1. Select SSH 2. Write Galileo s IP address 3. Leave port as Click Open

20 Linux via SSH The following window opens Type root as username and hit enter, no password is required

21 Linux via SSH Now you are inside Linux Yocto Project

22 Playing around with Linux

23 Playing around with Linux Now we can create files, folders, navigate though the Linux file system. You can use common Linux commands such as ls, cd, cd.., rm, Create a folder and name it as semanai

24 Playing around with Linux Now we can create files, folders, navigate though the Linux file system. You can use common Linux commands such as ls, cd, cd.., rm, Create a folder and name it as semanai Navigate to the folder $ mkdir semanai $ ls semanai

25 Playing around with Linux Now we can create files, folders, navigate though the Linux file system. You can use common Linux commands such as ls, cd, cd.., rm, Create a folder and name it as semanai Navigate to the folder $ mkdir semanai $ ls semanai $ cd semanai Create a file and name it hello.txt

26 No nano editor = ( We will use vi editor, old school

27 Playing around with Linux Now we can create files, folders, navigate though the Linux file system. You can use common Linux commands such as ls, cd, cd.., rm, Create a folder and name it as semanai Navigate to the folder $ mkdir semanai $ ls semanai $ cd semanai Create a file and name it hello.txt $ vi hello.txt

28 New file Write Hello world and save it

29 Vi editor To start editing this file press i (insert mode). Now you can type your text, after you finish, to save and exit file: Press escape key (exit editing mode) Type :wq (write and quit command)

30 Playing around with Linux If you want to display the content of a file in terminal type: $ cat hello.txt

31 Programming flexibility

32 Programming flexibility One of the advantages of having a OS is that we can program using different programming languages. We will make hello world in the following programming languages: Bash Python C Node.js

33 Bash A shell script is a file containing one or more commands that you would type on the command line. Create a file and name it hellobash.sh and write the following lines Execute the file by typing: #!/bin/bash #Author: Gerardo Carmona printf "Hello world! \n" $ sh hellobash.sh In computing, a shebang is the character sequence consisting of the characters number sign and exclamation mark (that is, "#!") at the beginning of a script. The program loader is instructed to run the program "/bin/sh" instead (usually this is the Bourne shell or a compatible shell), passing "path/to/script" as the first argument.

34 Python Create a file and name it hellopython.py and write the following lines Execute the file by typing: #!/usr/bin/python #Author: Gerardo Carmona print Hello world! $ python hellopython.py This is Python 2.x compatible only

35 C Create a file and name it helloc.c and write the following lines Compile file //Author: Gerardo Carmona #include <stdio.h> int main(){ printf( Hello world!\n ); } $ gcc helloc.c o hello Execute compiled file $./hello

36 Node.js Create a file and name it hellonode.js and write the following lines // Author: Gerardo Carmona console.log("hello world!"); Execute the file by typing: $ node hellonode.js

37 How GPIOs Works

38 Galileo Gen 1 Pinout

39 Accessing GPIOs To see a list of GPIOs type: $ cat /sys/kernel/debug/gpio

40 Accessing GPIOs You will observe that Galileo Gen2 contains 79 GPIO ports. Some of these pins are connected to the Arduino headers: GPIO Digital I/O GPIO Digital I/O gpio11 pin0 gpio38 pin7 gpio12 pin1 gpio40 pin8 gpio13 pin2 gpio4 pin9 gpio14 pin3 gpio10 pin10 gpio6 pin4 gpio5 pin11 gpio0 pin5 gpio15 pin12 gpio1 pin6 gpio7 pin13

41 Accessing GPIOs While the Intel Galileo, in essence, a very inexpensive Linux computer, there are a few things that distinguish it from laptop and desktop machines that we usually use for writing , browsing the web, or word processing. One of the main differences is that the Intel Galileo can be directly used in electronics projects because it has general purpose input and output pins right on the board. It also lacks a video output to connect to a monitor

42 Virtual files In order to manage gpios you need to write some configurations to different virtual files. They are a part of Linux s virtual file system, which is a system that makes it easier to access low-level functions of the board in a simpler way. For example, you could turn the LED on and off by writing to a particular section of the Intel Galileo memory, but doing so would require more coding and more caution.

43 Turning ON/OFF an LED

44 Accessing GPIOs Lets turn On/Off pin 8, that s gpio40. First we need to export gpio: $ echo -n 40" > /sys/class/gpio/export Above command will create /sys/class/gpio/gpio40 folder.

45 Accessing GPIOs Lets turn On/Off pin 8, that s gpio40. First we need to export gpio: $ echo -n 40" > /sys/class/gpio/export Above command will create /sys/class/gpio/gpio40 folder. Set the direction of gpio40 to out. $ echo -n "out" > /sys/class/gpio/gpio40/direction

46 Accessing GPIOs Lets turn On/Off pin 8, that s gpio40. First we need to export gpio: $ echo -n 40" > /sys/class/gpio/export Above command will create /sys/class/gpio/gpio40 folder. Set the direction of gpio40 to out. $ echo -n "out" > /sys/class/gpio/gpio40/direction Now we can turn on the LED and off: $ echo -n "1" > /sys/class/gpio/gpio40/value $ echo -n 0" > /sys/class/gpio/gpio40/value

47 Accessing GPIOs Lets turn On/Off pin 8, that s gpio40. First we need to export gpio: Above command will create /sys/class/gpio/gpio40 folder. Set the direction of gpio40 to out. Now we can turn on the LED and off: Unexport pin $ echo -n 40" > /sys/class/gpio/export $ echo -n "out" > /sys/class/gpio/gpio40/direction $ echo -n "1" > /sys/class/gpio/gpio40/value $ echo -n 0" > /sys/class/gpio/gpio40/value $ echo -n "40" > /sys/class/gpio/unexport

48 Challenge 1 Make a script in bash that blinks 10 times an LED. Use LED located on Pin 8 on Arduino (gpio40).

49 Some help For cicle in bash: for i in `seq 1 10`; do # Print echo $i done Challenge 1: Make a script in bash that blinks 10 times an LED. Use LED located on Pin 8 on Arduino, gpio40 in Linux.

50 Time to recharge batteries! Thanks!