A driver for the Adafruit 16-Channel 12-bit Servo Driver - I2C interface - PCA9685. http://www.adafruit.com/product/815
Built for the NVIDIA Jetson Nano Development Kit.
Only for SG90 / MG90s servos or other servos with similar PWM signal timing.
The default address for the PCA9685 is 0x40. On some Jetson models, this address is being used by other hardware.
The default bus for the Jetson Nano is 1 which means you should connect the SDA to Pin 3 and the SCL to the Pin 5.
In order to be able inspect the PCA9685, you may find it useful to install the i2c tools:
$ sudo apt-get install libi2c-dev i2c-tools
As an example, after installation, in a Terminal execute:
$ sudo i2cdetect -y -r 1
Replace the bus number 1 with the appropriate bus number.