Keyspan USB RS232 Adapter

To use a Keyspan USA-19 USB to RS232 adapter, you need to install “firmware-linux-free”: e.g.: apt-get -y install firmware-linux-free

Install seeed-voicecard

seeed voice card source code and linux kernel drivers

git clone https://github.com/HinTak/seeed-voicecard/
cd seeed-voicecard
sudo ./install.sh
sudo reboot

Installing Google AIY Voice Kit on Raspios

git clone https://github.com/google/aiyprojects-raspbian.git
    cd aiyprojects-raspbian
    git checkout voicekit
    sudo scripts/configure-driver.sh
    sudo scripts/install-alsa-config.sh

Add delay to systemd service:

ExecStartPre=/bin/sleep 30

CPU Activity Indicator

• Add a configuration directive to /boot/config.txt
  • dtoverlay=pi3-act-led,gpio=17
  • Wire LED with drop-resistor to GPIO 17 pin & ground

Not specific to Raspberry Pi, but to add public keys for repositories:

apt-key adv --keyserver keyserver.ubuntu.com --recv-keys {ID}