Project ARK's goal is to replace existing Aardvark I2C bridge with Arduino Uno board (Arduino Replaces aardvarK). The project contains:
arduino_io.py Python interface that allow user to interact with the bridge
i2c_usb_bridge.ino Arduino board FW
To use the scripts and firmware code, you need to have:
Python 2.7 with required modules installed (run "pip install -r requirements.txt")
Arduino IDE (download here https://www.arduino.cc/en/Main/Software)
To build and install the module as a python package, run:
pip install git+https://bitbucket.org/nextinput_sw/project_ark.git
or, if there's no Internet connection, run:
python setup.py sdist
pip install dist/arduino_io-[latest_version].tar.gz
The Arduino board is programmed to act as a virtual serial port to host machine. User can send and receive data by issuing serial command:
'A' set the I2C device address
'a' set the target register address
'l' set the length of read or write buffer
'w' indicates it's a write operation
'r' indicates it's a read operation
For example, to read 3 bytes from device 0x26, register 0x9d:
"A 26 a 9d l 03 r"
You can also control the Arduino digital GPIOs with the following commands:
'D' sets the pin number (2 through 13)
'M' sets the pin mode (0 = input, 1 = output, 2 = input pullup)
'<' reads from the digital pin (0 or 1)
'>' writes to the digital pin (0 or 1)
Pin config and IO capabilities are accessible through the APIs dio_mode, dio_read, and dio_write in arduino_io.py