Arabnet Conf 2014 Code & Design Day. GDG Beirut Code Lab: Duration: 1h30min Project Files: https://github.com/DonaldDerek/GoogleBeam Given By: Raghd Hamzeh, Donald Derek Haddad

2. The recipe
Hardware Stack
• Raspberry Pi Model B (512 MB Ram)
• Raspberry Pi Camera Module (2 MP) or
any compatible USB Cam *
• Ethernet Cable
• Wifi dongle: Edimax EW-7811Un 150Mbps Wireless
• SD Card ( 4 GB ++)

3. The recipe
Software Stack
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Raspbian OS
Node.js (v 0.10.2 +)
Python (V 2.7)
Shell Scripts
Twitter Stream API
Google Drive API

4. Downloading weapons
Node.js on Raspberry Pi: https://github.com/DonaldDerek/rPi-cheat-sheet

5. WARNING
coding mask on!

6. Connecting to your raspberry pi
ssh-ing
#Avahi Deamon should be installed
ssh pi@raspberrypi.local
#Static IP
shh pi@192.168.5.10
Usefull Links:
http://elinux.org/RPi_Advanced_Setup

7. * Testing USB Cam
Resurrecting ancient technologies
#Test USB Camera
Lsusb
#Take images from RaspberryPi USB Camera
fswebcam -d /dev/video0 -r 640x480 test.jpeg

8. Testing Rpi 2mp cam
Tiny yet amazing camera!
raspistill –o test.jpg -w 640 -h 480

9. WARNING
coding mask on!

10. App architecture
Where all your scripts belong
• node_modules/
• ntwitter/
• Request/
• bin/
• atom/
• gdata/
• gdrive.py
• images/
• App.js
• Config.js
• Controller.js
• Package.json
• tw-upload.js

11. Twitter stream api
The communication layer is built upon Twitter’s infrastructure
var twit = new twitter(config);
// Check Credentials
twit.verifyCredentials(function (err, data) {
if(err) console.log(err);
})
.stream('user', {track:watch}, function(stream) {
console.log("Twitter stream is ready and waiting for inc
tweets...")
stream.on('data', function (data) {
//Check if tweet is not empty
if (data.text !== undefined) {
//Action Code here
}
});
//Catch errors
stream.on('error', function (err, code) {
console.log("err: "+err+" "+code)
});

12. Child process
Control anything you can do in the terminal
child = exec("raspistill -o "+ image_path +" -w 640 -h 480",
function (err, stdout, stderr) {
//trigger another event
})

13. WARNING
coding mask on!

14. Google drive api
Light-weight python script
//Authenticate with Gdrive API
try:
docsclient.ClientLogin(username, password, docsclient.source);
except (gdata.client.BadAuthentication, gdata.client.Error), e:
sys.exit('Unknown Error: ' + str(e))
except:
sys.exit('Login Error, perhaps incorrect username/password')
print 'success!'
Resources: http://planzero.org/blog/2012/04/13/uploading_any_file_to_google_docs_with_python

15. WARNING
coding mask on!

16. May The Source be With you
https://github.com/DonaldDerek/GoogleBeam
DonaldDerek
DerekHaddad
rhamzeh
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