Table of Contents
1. Introduction
The libpixyusb2 library provides a software application programming interface (API) for communicating
with Pixy2 over USB. This allows you to write software that interfaces with Pixy2 like the PixyMon application.
The following procedure will outline the steps required for building the libpixyusb2 library and some example projects using the library. This procedure assumes the following:
- Your system has Linux Mint-18 installed
- Your system is connected to the internet
The Mint-18 distribution of Linux can be downloaded here: http://www.linuxmint.com
Although this procedure uses Linux Mint-18, it should work with any Linux distribution that uses the Debian package manager (e.g. Ubuntu).
2. Procedure
2.1. Install dependencies for building libpixyusb2
Start the terminal application:
In the terminal window type:
sudo apt-get install git libusb-1.0-0-dev g++
2.2. Build libpixyusb2
2.2.1 Download Pixy2 source code
In the terminal window type:
git clone https://github.com/charmedlabs/pixy2
2.2.2. Build the library
In the terminal window type:
./pixy2/scripts/build_libpixyusb2.sh
3. Example projects
Before trying the examples below, connect Pixy2 to your Linux system using a USB Micro-B cable:
3.1. Color Identification Example (GetBlocksCPPDemo)
The example does the following:
- Connects to Pixy2 using USB
- Displays firmware version installed on Pixy2
- Block information is displayed (as shown in the image above) if color signatures have been set and if the signatures are currently being detected by Pixy2.
3.1.1. Build the 'get_blocks_cpp_demo' example
In the terminal window type:
./pixy2/scripts/build_get_blocks_cpp_demo.sh
3.1.2. Start the example
To start the get blocks example, run 'getblockscpp_demo' as root.
In the terminal window type:
cd ./pixy2/build/get_blocks_cpp_demo
sudo ./get_blocks_cpp_demo
Block data received from Pixy2 is displayed in stdout.
3.2. Line Identification Example (GetLinesCPPDemo)
This example does the following:
- Connects to Pixy2 using USB
- Configures Pixy2 for line feature identification
3.2.1. Build the 'get_lines_cpp_demo' example
In the terminal window type:
./pixy2/scripts/build_get_lines_cpp_demo.sh
3.2.2. Start the example
To start the pantilt demo, run 'getlinescppdemo' as root.
cd ./pixy2/build/get_lines_cpp_demo
sudo ./get_lines_cpp_demo
3. Comments
We welcome your thoughts and feedback! Please let us know how we can improve.