The Official Raspberry Pi Projects Book - Projects_Book_v4

Tutorial

raspberrypi.org/magpi The Official Raspberry Pi Projects Book 115

and an automatic download of the JSON key should

begin. Keep track of this file! You should now use

an FTP program (such as FileZilla) or Samba (see

our tutorial at youtu.be/CEYwYqkAPfA) to move

the JSON file over to your Raspberry Pi. Place the

JSON file in the home directory /home/pi.

>STEP-08

Prepare the Raspberry Pi

We need to run a few commands to prepare the

Raspberry Pi. We only need to do this one time.

In the command line, run the following commands:

EMPATHYBOT

Above This project really only works well on non-bearded

humans. Beards interfere with the software

Above This project was tested on babies
and it works just fine on them too

STEP-04
Attach the sensors
We use the button sensor to give us an easy way to start
the robot up once the code is running, and the distance
sensor to judge how far we are from the human. Hang
the ultrasonic distance sensor from the front of the
GoPiGo, using small zip ties, and attach the button
to the top of the GoPiGo, also using zip ties.

STEP-05
Setup a free Google Cloud Vision account
You can use your Gmail or Google account to set this up.
At the time of publication, Google offers a 60-day free
account – magpi.cc/2hAk0tI.

STEP-06
Create a new project
This is an abbreviated version of the setup process.
You can see a pictorial walkthrough of how to set
up a new project in Google Cloud Vision online
here: magpi.cc/2hAhHqc.
Create a new project called ‘vision1’. Enable the Cloud
Vision API for vision1.

STEP-07
Download and install your JSON credentials
Head back to the Console in Google Cloud. Find
the box titled ‘Use Google APIs’ and click ‘Enable
and manage APIs’. Click on Credentials and Create
Credentials. Credentials is on the left-hand side,
with a picture of a key next to it. Select ‘Create
a Service Account Key’. Under Service Account,
select New Service Account. We’ll call this ‘vision’.
Finally, create a role. We’ll give the new role full
access, so select Project and Owner to give the Pi
full access to all resources. A pop-up window should
appear telling you that you have created a new key,

Language

>PYTHON

DOWNLOAD:

magpi.cc/2hAgqiT

sudo pip install --upgrade pip

sudo apt-get install libjpeg8-dev

sudo pip install --upgrade google-api-python-client

sudo pip install --upgrade Pillow

sudo apt-get install python-picamera

Finally, make the credentials we downloaded in the

previous step available to Python:

export GOOGLE_APPLICATION_

CREDENTIALS=filename.json

Here, replace ‘filename’ with the name of your JSON file.

>STEP-09

Run the code

If you’ve taken the code from our GitHub repo, or typed

it out yourself, you can now run the code:

sudo python empathybot.py

Point the robot towards your human subject, press the

Grove button on the GoPiGo, and let your robot start

interacting with some humans!