树莓派谷歌助手无需唤醒词激活及hotword.py代码修改咨询

Got it, let's tackle this problem for your Google Assistant + car turn signal project. The goal is to modify your hotword.py so the Assistant skips the hotword detection step and stays in a continuous listening state, ready to pick up navigation commands like "turn left" or "turn right" immediately.

Key Concept #

By default, the hotword.py script waits for the "OK Google/Hey Google" trigger before activating the Assistant's speech recognition. We need to replace that hotword detection loop with code that launches the Assistant in continuous listening mode right from startup.

Modified Code for hotword.py #

Here's the adjusted code you can use (replace your existing logic with this, and keep your turn signal trigger code intact):

import sys
from google.assistant.library import Assistant
from google.assistant.library.event import EventType
from google.oauth2.credentials import Credentials

# Replace with your actual credentials file path
CREDENTIALS_PATH = '/path/to/your/credentials.json'

def handle_assistant_events(event):
    # Keep your existing turn signal trigger logic here
    if event.type == EventType.ON_RECOGNIZING_SPEECH_FINISHED:
        command_text = event.args['text'].lower()
        if 'turn left' in command_text:
            # Add your code to trigger left turn signal here
            print("✅ Left turn signal activated!")
        elif 'turn right' in command_text:
            # Add your code to trigger right turn signal here
            print("✅ Right turn signal activated!")

def main():
    try:
        creds = Credentials.from_authorized_user_file(CREDENTIALS_PATH)
        with Assistant(creds) as assistant:
            print("🔊 Google Assistant is now continuously listening...")
            # Start persistent listening without hotword trigger
            for event in assistant.start():
                handle_assistant_events(event)
    except Exception as e:
        print(f"Error starting assistant: {e}", file=sys.stderr)
        sys.exit(1)

if __name__ == '__main__':
    main()

Important Notes #

• Credentials Path: Update CREDENTIALS_PATH to point to your actual Google Assistant SDK credentials file.
• Audio Setup: Ensure your microphone is properly configured for the Assistant—continuous listening relies on a stable, uninterrupted audio stream.
• Custom Logic: Keep your existing turn signal control code inside the handle_assistant_events function, where we check for navigation commands.
• Testing: Run the modified script and speak commands directly—you won't need to say "OK Google" to trigger the Assistant anymore.

Why This Works #

The assistant.start() method launches the Assistant in a persistent listening state, bypassing the hotword detection layer entirely. Every speech input is processed immediately, which aligns perfectly with your project's need to react to navigation commands without extra wake-up prompts.

内容的提问来源于stack exchange，提问作者afifizain