Pi Zero - forked and modified from warchildmd's repo (https://github.com/warchildmd/google-assistant-hotword-raspi)

1. Headless auto start on boot with multiple custom wakeword activation triggers.
2. Voice control of GPIOs without IFTTT, api.ai, Actions SDK.
3. Voice control of servo connected to RPi GPIO.
4. Safe shutdown RPi using voice command.
5. Stream Music from YouTube.
6. Indicator lights for assistant listening and speaking events.
7. Startup audio and audio feedback for wakeword detection.

1. Mute button.
2. Neopixel indicator without Arduino.

This is implemented in Python2 so your existing Google Assistant may not work. So please start by making a fresh copy of latest Raspbian Stretch

FIRST STEP- CLONE the PROJECT on to Pi

1. Open the terminal and execute the following

git clone https://github.com/shivasiddharth/GassistPi

INSTALL AUDIO CONFIG FILES

1. Update OS and Kernel

sudo apt-get update  
sudo apt-get install raspberrypi-kernel  

2. Restart Pi

3. Choose the audio configuration according to your setup.
   (Run the commands till you get .bak notification in the terminal)

3.1. USB DAC or USB Sound CARD users,

sudo chmod +x /home/pi/GassistPi/audio-drivers/USB-DAC/scripts/install-usb-dac.sh  
sudo /home/pi/GassistPi/audio-drivers/USB-DAC/scripts/install-usb-dac.sh 

3.2. AIY-HAT users,

sudo chmod +x /home/pi/GassistPi/audio-drivers/AIY-HAT/scripts/configure-driver.sh  
sudo /home/pi/GassistPi/audio-drivers/AIY-HAT/scripts/configure-driver.sh  

sudo chmod +x /home/pi/GassistPi/audio-drivers/AIY-HAT/scripts/install-alsa-config.sh  
sudo /home/pi/GassistPi/audio-drivers/AIY-HAT/scripts/install-alsa-config.sh  

3.3. USB MIC AND HDMI users,

sudo chmod +x /home/pi/GassistPi/audio-drivers/USB-MIC-HDMI/scripts/install-usb-mic-hdmi.sh  
sudo /home/pi/GassistPi/audio-drivers/USB-MIC-HDMI/scripts/install-usb-mic-hdmi.sh  

3.4. USB MIC AND AUDIO JACK users,

sudo chmod +x /home/pi/GassistPi/audio-drivers/USB-MIC-JACK/scripts/usb-mic-onboard-jack.sh  
sudo /home/pi/GassistPi/audio-drivers/USB-MIC-JACK/scripts/usb-mic-onboard-jack.sh 

3.5. CUSTOM VOICE HAT users,

sudo chmod +x /home/pi/GassistPi/audio-drivers/CUSTOM-VOICE-HAT/scripts/custom-voice-hat.sh  
sudo /home/pi/GassistPi/audio-drivers/CUSTOM-VOICE-HAT/scripts/custom-voice-hat.sh  

sudo chmod +x /home/pi/GassistPi/audio-drivers/CUSTOM-VOICE-HAT/scripts/install-i2s.sh  
sudo /home/pi/GassistPi/audio-drivers/CUSTOM-VOICE-HAT/scripts/install-i2s.sh 

Those Using HDMI/Onboard Jack, make sure to force the audio

sudo raspi-config  

Select advanced options, then audio and choose to force audio

Those using any other DACs or HATs install the cards as per the manufacturer's guide and then you can try using the USB-DAC config file after changing the hardware ids

4. Restart Pi

5. Check the speaker using the following command

speaker-test -t wav  

CONTINUE after SETTING UP AUDIO

1. Download credentials--->.json file (refer to this doc for creating credentials https://developers.google.com/assistant/sdk/develop/python/config-dev-project-and-account)

2. Place the .json file in/home/pi directory

3. Rename it to assistant--->assistant.json

4. Using the one-line installer for installing Google Assistant and Snowboy dependencies
   Pi3 and Armv7 users use the "gassist-installer-pi3.sh" installer and Pi Zero, Pi A and Pi 1 B+ users use the "gassist-installer-pi-zero.sh" installer. Snowboy installer is common for both
   4.1 Make the installers Executable

   sudo chmod +x /home/pi/GassistPi/scripts/gassist-installer-pi3.sh
   sudo chmod +x /home/pi/GassistPi/scripts/gassist-installer-pi-zero.sh
   sudo chmod +x /home/pi/GassistPi/scripts/snowboy-deps-installer.sh  
   
   

   4.2 Execute the installers (Run the snowboy installer first. Don't be in a hurry and Don't run them parallely, Run them one after the other

   sudo  /home/pi/GassistPi/scripts/snowboy-deps-installer.sh
   sudo  /home/pi/GassistPi/scripts/gassist-installer-pi-zero.sh
   sudo  /home/pi/GassistPi/scripts/gassist-installer-pi3.sh  
   
   

5. Copy the google assistant authentication link from terminal and authorize using your google account

6. Copy the authorization code from browser onto the terminal and press enter

7. Move into the environment and test the google assistant according to your board

source env/bin/activate  
google-assistant-demo 
googlesamples-assistant-pushtotalk   

8. After verifying the working of assistant, close and exit the terminal

HEADLESS AUTOSTART on BOOT SERVICE SETUP

1. Make the service installer executable

sudo chmod +x /home/pi/GassistPi/scripts/service-installer.sh 

2. Run the service installer

sudo /home/pi/GassistPi/scripts/service-installer.sh    

3. Enable the services - Pi3 and Armv7 users, if you need custom wakeword functionality, then enable both the services, else enable just the "gassistpi-ok-ggogle.service" - Pi Zero, Pi A and Pi 1 B+ users, enable snowboy services alone

sudo systemctl enable gassistpi-ok-google.service  
sudo systemctl enable snowboy.service

4. Start the service - Pi3 and Armv7 users, if you need custom wakeword functionality, then start both the services, else start just the "gassistpi-ok-ggogle.service" - Pi Zero, Pi A and Pi 1 B+ users, start snowboy services alone

sudo systemctl start gassistpi-ok-google.service  
sudo systemctl start snowboy.service   

RESTART and ENJOY

INDICATORS for GOOGLE ASSISTANT'S LISTENING AND SPEAKING EVENTS

Connect LEDs with colours of your choice to GPIO05 for Listening and GPIO06 for Speaking Events.

VOICE CONTROL of GPIOs, SERVO and Pi SHUTDOWN

The default GPIO and shutdown trigger word is trigger. It should be used for controlling the GPIOs, servo and for safe shutdown of Pi.

It has been intentionally included to prevent control actions due to false positive commands. If you wish to change the trigger word, you can replace the 'trigger'in the main.py and assistant.py code with your desired trigger word.

The default keyword for servo motor is servo. For example, the command trigger servo 90 will rotate the servo by 90 degrees.

If you wish to change the keyword, you can replace the 'servo' in the action.py script with your desired keyword for the motor.

For safe shutdown of the pi, command is: trigger shutdown

You can define your own custom actions in the actions.py script.
THE ACTIONS SCRIPT OF THIS PROJECT IS DIFFERENT FROM AIY KIT's SCRIPT, COPY PASTING THE COMMANDS FROM AIY's ACTION SCRIPT WILL NOT WORK HERE. FOR A BETTER UNDERSTANDING OF THE ACTIONS FILE, FOLLOW THE YOUTUBE VIDEO.

MUSIC STREAMING from YOUTUBE

Default keyword for playing music from YouTube is Play. For example, Play I got you command will fetch Bebe Rexha's I Got You from YouTube.

Music streaming has been enabled for both OK-Google and Custom hotwords/wakewords.

Due to the Pi Zero's limitations, users are advised to not use the Music streaming fueature. Music streaming will send the CPU usage of Pi Zero into the orbit.

FOR NEOPIXEL INDICAOR

1. Change the Pin numbers in the given sketch according to your board and upload it.

2. Follow the circuit diagram given.

Now you have your Google Home Like Indicator