Sending Voice Announcements via Google Home Using SinricPro

Google Home does not support arbitrary text-to-speech (TTS) announcements through the Smart Home API for third-party integrations like SinricPro. However, you can achieve voice announcements indirectly using Google Home Routines (called “Routines” in the Google Home app) combined with a virtual device trigger.

Method: Google Home Routines + SinricPro Switch

Step-by-Step:

Create a Google Home Routine
- Open the Google Home app.
- Go to Routines → + Create new routine.
- Under “When this happens”, choose “Device state” (e.g., “When [Device] turns on”).
- Under “Add action”, select “Assistant voice” or “Speak response”, and enter your custom announcement (e.g., “The garage door is open.”).
- Save the routine.
Add a Switch in SinricPro
- In your SinricPro dashboard, create a new Switch device.
- Give it a recognizable name (e.g., “Announcement Trigger”).
Trigger the Announcement
- From your code or automation system, send a sendPowerStateEvent command to turn on the Switch via SinricPro.
- This state change is detected by Google Home and triggers the associated routine, causing the Google Assistant to speak your message.

Example code for ESP8266/ESP32:

void triggerVoiceAnnouncement() {
    SinricProSwitch& mySwitch = SinricPro[SWITCH_ID];
    mySwitch.sendPowerStateEvent(true);
} 

Limitation:

This approach supports predefined announcements only. If you need to send dynamic/runtime messages (e.g., “Current temperature is 23°C”), Google Home does not support this via standard Smart Home APIs. In such cases, you’d need to explore alternative solutions like broadcast notifications on Android devices or third-party TTS speakers, which fall outside the official Google Smart Home framework.