Project 1 – Python control of a PWM board driving RC servo motors
You should now have a reasonable understanding of what is required to program an I2C PWM board, so let's look at some Python code to drive the Adafruit 16 channel PWM board.
The python-smbus library is compatible only with Python 2 at the time of writing. To run PCA9685, you have to use IDLE and not IDLE3. To run from the command line, use Python and not Python 3. As with the
RPi-GPIO library, the SMBus library needs to have root privileges.
First, create a new
/home/pi/servo project directory for the files and download
pca9685.py from the
Chapter 6 folder at http://1drv.ms/1ysAxkl into the directory.
Then, open the
pca9685.py file in the idle development environment, remembering ...