Appendix A. The BeagleBone Black Pinout
This figure shows the pinouts of the P8 and P9 expansion headers on the BeagleBone Black, color-coded by subsystem. P9 is shown on the left and P8 is shown on the right, to match their physical orientation on the board:
The pins with multiple functions can only be used for one thing at a time, for example, PWM1A shouldn't be used if GPIO1_18 is already in use.
Note
Some pins on the P8 header are reserved for the HDMI output by default and can't be used without disabling HDMI. See Appendix B: Disabling HDMI for more info.
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