Using the Adafruit_BBIO library with the BeagleBone Black (BBB) is fairly simple, especially if you're familiar with the RPi.GPIO library for the Raspberry Pi.

To start, you'll want to import the library. There are two different options at this time to import. The first one is for GPIO:

import Adafruit_BBIO.GPIO as GPIO

import Adafruit_BBIO.GPIO as GPIO

If you'd like to use PWM, then import as follows:

import Adafruit_BBIO.PWM as PWM

import Adafruit_BBIO.PWM as PWM

You can access the channels by either referencing the pin "key" or the name. If you look at your BeagleBone Black, you can see that each set of pin headers has a name, either P8 or P9. Then, you can see that there are pin numbers that start from 1, and go to 46.

When you count the pins, you don't go length-wise, but start at 1, then across to 2, and then back up to the next pin 3, and so on. The following image illustrates this a bit better:

So, to access the first pin on P9, you'd use "P9_1". You can also use the name of the pin to access it, which would be . You wouldn't want to do this though, as P9_1 is actually gnd! You'll want to view the last page of this guide to see which pins are available to use.