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I created a Toy which Talks somebody's tweets using Raspberry Pi.
This Toy catches object by distance sensor and then make sound (Tweet).

The architecture is very simple. For getting Tweets, just using twitter api for python. And playing sound with "AquesTalk Pi" (free) which is created by Japanese software company. Unfortunately AquesTalk Pi only supports Japanese words so cant handle English and alphabet. Maybe "eSpeak" works for English, I haven't tested it.

[materials]
- raspberry pi type B
- usb wifi adapter
- MCP3008(Analog-to-Digital Converter)
- sharp distance sensor (GP2Y0A02YK)
- small speaker
- Redbull

Program source and wiring on breadboard is based on "Analog Inputs for Raspberry Pi Using the MCP3008".
Thanks Mikey Sklar.

Step 1: Enable Sound

$ sudo nano /boot/config.txt

add "hdml_drive = 1" line and save (cntrl + O[enter]).

this enables sound out put to 3.5 mm jack. In case of connecting HDMI, HDMI is set as Sound output device so it's need to chenge.

$alsamixer

Gain volume by up key. Default is a bit small.

Step 2: Install Twitter API and Related Modules

install httplib module
$ wget https://httplib2.googlecode.com/files/httplib2-0.8.zip
$ unzip httplib2-0.8.zip
$ cd httplib2-0.8
$ sudo python setup.py install

install simplejson module
$ git clone https://github.com/simplejson/simplejson
$ cd simplejson
$ sudo python setup.py install

install oauth2 module
$ git clone https://github.com/simplegeo/python-oauth2
$ cd python-oauth2
$ sudo python setup.py install

install twitter module
$ git clone https://github.com/bear/python-twitter
$ cd python-twitter-master
$ sudo python setup.py build
$ sudo python setup.py install

Step 3: Assembling a Breadboard

Step 4: Register App on Https://dev.twitter.com/

To use Twitter API, you need to register app on Twitter developers.
After registration, take a note some security codes like Consumer key / Consumer secret / Access token / Access token secret.
sorry I don't write the procedure here. You can find it  in the internet.

Step 5: Test Run Program

$ git clone https://github.com/Azuwoo/TweeToy
$ cd TweeToy
$ sudo nano run.py

modfiy 2  parts bellow. If you want to speak some tweet (not only one), add "for" sentence "after if trim_pot < 600:".
This video of top page is set loop.

--------------------------------------------------------------------------------------------
# dev account ....(1)
api = twitter.Api(consumer_key='user consumer_key',
consumer_secret='user consumer_secret',
        access_token_key='user access_token_key',
        access_token_secret='user access_token_secret')

# specify the account you want to get tweet from ....(2)
account = '@dave_spector'
--------------------------------------------------------------------------------------------

$ sudo python run.py

Close something to the senser.  You might get sound of Tweet.

And then schedule "run.py" in crontab( crontab -e) for periodically execution like 5sec or 10sec.

That's ALL!!!
<p>Wow! This is really cool. </p>

About This Instructable

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Bio: Japanese, in Tokyo. Server Engineer.
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