Library for communication with PCF8575 IO expander over I2C
Project description
PCF8575
Python library for the PCF8575 I2C IO expander. It abstracts the 16 bit IO port as a Python list, and allows the read/writing of individual pins or the whole port at once. This is a modified version of the PCF8574 library to support the extra 8 ports.
Installation
The library depends on the smbus-cffi package. You may need to apt-get install libffi-dev if you're on a debian based system. Otherwise, simply:
pip install pcf8575
Usage
In [1]: from pcf8575 import PCF8575 In [2]: i2c_port_num = 1 In [3]: pcf_address = 0x20 In [4]: pcf = PCF8575(i2c_port_num, pcf_address) In [5]: pcf.port Out[5]: [True, True, True, True, True, True, True, True] In [6]: pcf.port[0] = False In [7]: pcf.port Out[7]: [False, True, True, True, True, True, True, True] In [8]: pcf.port = [True, False, True, False, True, False, True, False] In [9]: pcf.port Out[9]: [True, False, True, False, True, False, True, False] In [10]: pcf.port[7] Out[10]: False In [11]: pcf.port[6] Out[11]: True
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