PCA9685 16채널 서보모터쉴드

pi@raspberrypi:~ $ sudo apt-get install git build-essential python-dev
pi@raspberrypi:~ $ git clone https://github.com/adafruit/adafruit_python_pca9685.git
pi@raspberrypi:~ $ cd adafruit_python_pca9685
pi@raspberrypi:~ $ sudo python setup.py install
pi@raspberrypi:~ $ cd examples
pi@raspberrypi:~ $ python simpletest.py
IOError: [Error 2] No such file or directory: '/dev/i2c-1'와 같이 에러가 난다면
pi@raspberrypi:~ $ sudo raspi-config

pi@raspberrypi:~/Adafruit_Python_PCA9685/examples $ nano simpletest.py