Audio output on Raspberry Pi

[danic85]

The initial approach to connect neopixels (addressable LEDs used in the 'eye') to the Raspberry Pi was following this guide:

https://learn.adafruit.com/neopixels-on-raspberry-pi/raspberry-pi-wiring

There is a note around disabling audio:

Sound must be disabled to use GPIO18. This can be done in /boot/config.txt by changing "dtparam=audio=on" to "dtparam=audio=off" and rebooting.

This prevents audio output from being used alongside neopixels connected to GPIO18.

However: NeoPixels must be connected to GPIO10, GPIO12, GPIO18 or GPIO21 to work! GPIO18 is the standard pin.

The implementation in v2 and v3 use GPIO12, but I haven't been able to enable audio again successfully on my device. It may be a configuration fault. This is something that should be considered before enabling neopixels with the PI.

Note that this limitation is not present on the Jetson Nano.

[danic85]

Branch in progress to support this, migrating neopixel support to an i2c driver.

Read More: #30 and https://github.com/dmt-labs/modular-biped/wiki/Software:-Modules#neopixel

[danic85]

This has been merged now, so audio output is supported by default on the Pi.