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wiki:v1:hooking_up_pixy_to_a_raspberry_pi

Hooking up Pixy to a Raspberry Pi

1. Introduction

The following procedure outlines the steps required to build the 'hello_pixy' example on a Raspberry Pi using the Raspberrian disribution. The 'hello_pixy' example is a simple program that demonstrates how to read blocks and send commands to the Pixy over USB like PixyMon.

You will need:

  • SD Card with NOOBS 1.3.9 installed
  • USB Hub with at least three ports
  • Pixy updated to latest firmware (1.0.2)
  • libpixyusb version is 0.3

NOOBS is available from the Raspberry Pi website here: http://www.raspberrypi.org/downloads/

2. Procedure

2.1. Raspberry Pi Hardware Setup

2.1.1. Connect your Raspberry Pi to the Internet

Using an Ethernet cable, connect the Raspberry Pi to an internet source as shown below.

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2.1.2. Connect your Raspberry Pi to a video display

Using an HDMI cable, connect the Raspberry Pi to a video display as shown below.

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2.1.3. Connect Keyboard, Mouse, and Pixy to USB hub

The Raspberry Pi only has two USB ports, so a hub is needed to connect Pixy, a keyboard, and mouse simultaneously. Using the hub, connect your keyboard, mouse, and Pixy to the Raspberry Pi.

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2.1.4. Insert NOOBS SD Card

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2.1.5. Connect power to Raspberry Pi

2.2. Raspberry Pi Software Setup

2.2.1. Install Raspberrian

On first boot, NOOBS will display a list of install options for the Raspberry Pi. Select Raspberrian and click the install button.

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Click the 'Yes' button to confirm installing.

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The installer will begin installing Raspberry Pi system files. This will take some time.

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When the installer is finished, click the 'OK' button to restart.

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When the Raspberry Pi boots, the configuration menu will be displayed. Select the 'Enable Boot to Desktop/Scratch…' option.

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Select 'Desktop log in as user pi at the graphical desktop' and select 'OK'.

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Select 'Finish' to exit the configuration menu.

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Select 'Okay' to reboot.

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2.3. Software Dependency Installation

From the Raspberry Pi desktop, start the LXTerminal application.

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2.3.1. Install libusb

In the terminal window type:

sudo apt-get install libusb-1.0-0.dev

2.3.2. Install libboost

In the terminal window type:

sudo apt-get install libboost-all-dev

2.3.3. Install cmake

In the terminal window type:

sudo apt-get install cmake

2.4. Install Pixy Source Code

In the terminal window type:

git clone https://github.com/charmedlabs/pixy.git

2.5 Build and install libpixyusb

2.5.1. Build the library

In the terminal window type:

cd pixy/scripts
./build_libpixyusb.sh

2.5.2. Install the library

In the terminal window type:

sudo ./install_libpixyusb.sh

2.6. Running the 'hello_pixy' example

2.6.1. Build the example

In the terminal window type:

./build_hello_pixy.sh

2.6.2. Run the example

In the terminal window type:

cd ../build/hello_pixy
sudo ./hello_pixy

The output should look like something below:

Hello Pixy:
Example Version: 0.3
Pixy Firmware Version: 1.0.2
Detecting blocks...
[sig: 1 w: 11 h: 17 x:149 y: 46]
[sig: 1 w: 9 h: 21 x:148 y: 46]
[sig: 1 w: 14 h: 21 x:151 y: 45]
[sig: 1 w: 10 h: 19 x:149 y: 47]
[sig: 1 w: 8 h: 16 x:148 y: 49]
[sig: 1 w: 9 h: 19 x:148 y: 45]
[sig: 1 w: 12 h: 6 x:150 y: 54]
[sig: 1 w: 15 h: 18 x:151 y: 46]
[sig: 1 w: 11 h: 5 x:149 y: 54]
[sig: 1 w: 9 h: 7 x:148 y: 49]
[sig: 1 w: 11 h: 5 x:149 y: 50]
[sig: 1 w: 8 h: 6 x:148 y: 47]
[sig: 1 w: 10 h: 7 x:149 y: 51]

The example does the following

  • Connects to Pixy using USB
  • Displays firmware version installed on Pixy
  • Block information is displayed if color signatures have been set and if the signatures are currently being detected by Pixy.

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wiki/v1/hooking_up_pixy_to_a_raspberry_pi.txt · Last modified: 2018/01/08 22:45 by jfrench