How did you get the data in the debug window. Using my google home I threw a debug node on the output
and my debug window draws a blank. My google homes are working in nodered with other flows as I use them on tts google_say.
Here is my flow that I use for numerous announcements and the alarm:
[{"id":"eead7d9d.051e","type":"api-call-service","z":"f9a8a8ea.c4b0f8","name":"Set volume to 100%","server":"1b36a1cc.1e72ee","service_domain":"media_player","service":"volume_set","data":"{\"entity_id\":\"media_player.bedroom_speaker\",\"volume_level\":1}","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":false,"x":1780,"y":880,"wires":[[]]},{"id":"4494668b.223168","type":"switch","z":"f9a8a8ea.c4b0f8","name":"100%?","property":"data.attributes.volume_level","propertyType":"msg","rules":[{"t":"neq","v":"1","vt":"num"}],"checkall":"true","repair":false,"outputs":1,"x":1430,"y":880,"wires":[["eead7d9d.051e","e39c7d3f.4ab0b"]]},{"id":"389f0326.13fb6c","type":"api-current-state","z":"f9a8a8ea.c4b0f8","name":"Bedroom Speaker","server":"1b36a1cc.1e72ee","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":true,"entity_id":"media_player.bedroom_speaker","state_type":"str","state_location":"payload","override_payload":"msg","entity_location":"data","override_data":"msg","blockInputOverrides":false,"x":1250,"y":880,"wires":[["4494668b.223168"]]},{"id":"e39c7d3f.4ab0b","type":"function","z":"f9a8a8ea.c4b0f8","name":"","func":"msg.payload =\n{\n \"data\":{\n \"entity_id\":\"media_player.bedroom_speaker\",\n \"volume_level\": msg.data.attributes.volume_level\n }\n}\nreturn msg;","outputs":1,"noerr":0,"x":1430,"y":940,"wires":[["4f516e52.57f07"]]},{"id":"c1afee90.99e03","type":"api-call-service","z":"f9a8a8ea.c4b0f8","name":"Set volume to Previous","server":"1b36a1cc.1e72ee","service_domain":"media_player","service":"volume_set","data":"{}","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":false,"x":1790,"y":940,"wires":[[]]},{"id":"4f516e52.57f07","type":"ha-wait-until","z":"f9a8a8ea.c4b0f8","name":"","server":"1b36a1cc.1e72ee","outputs":1,"entityId":"alarm_control_panel.house","property":"state","comparator":"is","value":"disarmed","valueType":"str","timeout":0,"timeoutUnits":"seconds","entityLocation":"","entityLocationType":"none","checkCurrentState":true,"x":1580,"y":940,"wires":[["c1afee90.99e03"]]},{"id":"1b36a1cc.1e72ee","type":"server","z":"","name":"Home Assistant","legacy":false,"hassio":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true}]
[{"id":"f9af48c9.471648","type":"api-call-service","z":"63ea4fd.14ed3b","name":"Set volume to 50%","server":"1b36a1cc.1e72ee","service_domain":"media_player","service":"volume_set","data":"{\"entity_id\": \"media_player.living_room_speaker\", \"volume_level\": 0.5 }","mergecontext":"","x":1570,"y":480,"wires":[[]]},{"id":"37589482.af76bc","type":"switch","z":"63ea4fd.14ed3b","name":"50% ?","property":"data.attributes.volume_level","propertyType":"msg","rules":[{"t":"neq","v":"0.5","vt":"num"}],"checkall":"true","repair":false,"outputs":1,"x":1370,"y":540,"wires":[["f9af48c9.471648","b2037777.2d64a8"]]},{"id":"45c120d4.e132c","type":"api-current-state","z":"63ea4fd.14ed3b","name":"Speaker","server":"1b36a1cc.1e72ee","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":true,"entity_id":"media_player.living_room_speaker","state_type":"str","state_location":"payload","override_payload":"msg","entity_location":"data","override_data":"msg","blockInputOverrides":false,"x":1220,"y":540,"wires":[["37589482.af76bc"]]},{"id":"b2037777.2d64a8","type":"function","z":"63ea4fd.14ed3b","name":"","func":"msg.payload =\n{\n \"data\":{\n \"entity_id\":\"media_player.living_room_speaker\",\n \"volume_level\": msg.data.attributes.volume_level\n }\n}\nreturn msg;","outputs":1,"noerr":0,"x":1510,"y":540,"wires":[["76f78e06.d0958"]]},{"id":"76f78e06.d0958","type":"delay","z":"63ea4fd.14ed3b","name":"","pauseType":"delay","timeout":"6","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":1640,"y":540,"wires":[["1d043b26.2af975"]]},{"id":"1d043b26.2af975","type":"api-call-service","z":"63ea4fd.14ed3b","name":"Set volume to Previous","server":"1b36a1cc.1e72ee","service_domain":"media_player","service":"volume_set","data":"{}","mergecontext":"","x":1830,"y":540,"wires":[[]]},{"id":"1b36a1cc.1e72ee","type":"server","z":"","name":"Home Assistant","legacy":false,"hassio":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true}]Works a charm, pretty simply to follow.
For anyone reading. The difference between the two examples is the top flow waits for state change (eg the alarm changes to disarm) and then returns volume back.
Whereas the bottom group just has a timer delay (eg 6 seconds) before returning the volume.
I put my output ie Google Home Speaker on the ‘Set volume to… 100%’ service node.
I will roll this out pretty much anywhere I have an announcement in my NodeRed 
.
Here’s my change
Before. TTS announcement plays at whatever level speaker is currently set too.
If you’re going to be using this sequence quite regularly, I’d suggest converting it into a subflow.
This will allow you to only have to insert a single “subflow” node whenever you require it. 
You can then access the subflow directly from your palette.
Great tip… Another one I will implement!!
why do you not use a NR node to directly send the announcement to your google home?
like
I did originally try Cast when I purchased my first Google home and alot more green to NR but I couldn’t get the text to speech to work.
Looking at it again I can see that the quick start guide has been added to now giving examples and I can see now I just needed to put the text on the incoming payload and she/it will read out the incoming payload.
For what I need at the moment in my Alarm flow the TTS with google say and with the added volume level control and return to previous level shown by @onkytonk it is functioning perfectly.
I can see now you have mentioned it that Cast node with more notes looks like its worth having look over and see what features I can adopt for other areas of my node red.
Is there a way, I can wait until TTS finished?
Unfortunately, the flow continues and I have no information when the Say command finished.
The only possible solution I found so far is to set a predefined delay.
But since I want to output a dynamic text which can be either 10 characters long or 200, the duration varies and I cannot simply set a fix delay.
I tried to wait until the media_player_mpd turns “off” which it does sometimes after TTS finished, but not always. And then the volume stays high.
Just because I’m curious, I also can’t get the debug info in the detailed way… how do I get all the info?
Not sure if this helps
Hey mate, sorry it’s been awhile, just checking…
Does your original flow still work for you with setting the volume back to the original volume?
I glued a Xiaomi push button next to my front door as door bell and using it to play doorbell mp3s on my google homes.
It sets the volume fine but doesn’t return the volume to the previous volume.
[{"id":"219d9dc2.09e732","type":"debug","z":"d1ff6d76.b90a8","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"payload","targetType":"msg","x":2430,"y":1600,"wires":[]},{"id":"3a0c0487.a8836c","type":"cast-to-client","z":"d1ff6d76.b90a8","name":"Playroom","url":"http://192.168.86.229:8123/local/doorbell.mp3","contentType":"audio","message":"","language":"en","ip":"192.168.86.40","port":"","volume":"","x":2360,"y":1680,"wires":[[]]},{"id":"5401f546.dec15c","type":"api-call-service","z":"d1ff6d76.b90a8","name":"Set volume to 20%","server":"a661f859.8644a8","version":1,"debugenabled":false,"service_domain":"media_player","service":"volume_set","entityId":"media_player.googlehome4405","data":"{\"volume_level\":0.2}","dataType":"json","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":false,"x":1910,"y":1600,"wires":[["ada484de.1a9d58"]]},{"id":"4f748a5f.6c30c4","type":"switch","z":"d1ff6d76.b90a8","name":"20%?","property":"data.attributes.volume_level","propertyType":"msg","rules":[{"t":"neq","v":"0.2","vt":"num"}],"checkall":"true","repair":false,"outputs":1,"x":1610,"y":1600,"wires":[["5bec789d.b19d48","5401f546.dec15c"]]},{"id":"5a1e3c83.7c7e24","type":"api-current-state","z":"d1ff6d76.b90a8","name":"Playroom Speaker","server":"a661f859.8644a8","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":true,"entity_id":"media_player.googlehome4405","state_type":"str","state_location":"payload","override_payload":"msg","entity_location":"data","override_data":"msg","blockInputOverrides":false,"x":1430,"y":1600,"wires":[["4f748a5f.6c30c4"]]},{"id":"5bec789d.b19d48","type":"function","z":"d1ff6d76.b90a8","name":"","func":"msg.payload =\n{\n \"data\":{\n \"entity_id\":\"media_player.garage_speaker\",\n \"volume_level\": msg.data.attributes.volume_level\n }\n}\nreturn msg;","outputs":1,"noerr":0,"x":1610,"y":1660,"wires":[["422b3aef.040814"]]},{"id":"98acbd33.2546c","type":"api-call-service","z":"d1ff6d76.b90a8","name":"Set volume to Previous","server":"a661f859.8644a8","version":1,"debugenabled":false,"service_domain":"media_player","service":"volume_set","entityId":"media_player.googlehome4405","data":"{}","dataType":"json","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":false,"x":1970,"y":1660,"wires":[[]]},{"id":"ada484de.1a9d58","type":"change","z":"d1ff6d76.b90a8","name":"","rules":[{"t":"set","p":"payload","pt":"msg","to":"on","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":2132,"y":1599,"wires":[["3a0c0487.a8836c","219d9dc2.09e732"]]},{"id":"422b3aef.040814","type":"delay","z":"d1ff6d76.b90a8","name":"","pauseType":"delay","timeout":"10","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":1760,"y":1660,"wires":[["98acbd33.2546c"]]},{"id":"a661f859.8644a8","type":"server","z":"","name":"HA - Default","legacy":false,"addon":true,"rejectUnauthorizedCerts":true,"ha_boolean":"y|yes|true|on|home|open","connectionDelay":true}]
ps I chose the cast node at the end as I am using .mp3 rather than tts.
Hey bud,
I’ve been out of the home assistant scene for a while, since we were waiting for our new home to be built. Got HA up and running last week but haven’t implemented any major automations yet, so can’t say if these are working for me or not.
If I get a chance to experiment, I’ll let you know.
Hey,
Did you ever find a solution for this?
I am in need of the exact same thing myself.
I have tried checking for state change to identify when the TTS is done, but I cannot seem to find any clear identification for this.
Unfortunately not. I stopped searching for a soluation short after, but I would definitely be thankful for any ideas.
Allright, good to know.
My plan B now is to try a couple of different messages with different lengths and try to extrapolate the average speech length for a certain length in the message string.
This will obviously vary with different voices and languages, as well as what TTS engine, being used, but I don’t know any other way. I also think it might work well enough, especially if one add a small static delay of 500 milliseconds after the calculated speech length as a buffer.
I’ll make sure to post my flow here when I have tried my hand at this.
I’m a newbie in node-red, and I’d like to implement exactly what is in this topic. When the garage door opens, I’d like to have a notification on one of my cast device. I could manage it, works great. No I want to handle the volume. Store the current, set it on a different and set back to the tored original. I saw storing is possible with the “function” node. Could somebody make a screenshot how the node set up to store “{{data.attributes.volume_level}}” and also screenshot on set the previous volume in a call service node?
I have the state node “current_state: media_player.kitchen_display”, wich gives “{{data.attributes.volume_level}}”.
Thanks a lot! So I have the current state. If I’m right “vana_magata” is the variable for the volume. So the volume is stored in “vana_magata”.
To be honest, I’m still not clear 
Can you please post the window screenshot of the “Function” node and the “Call service node” whict sets back to the original?
service node and data part:
{ "volume_level": {{flow.vana_laud.attributes.volume_level}}}
and i’m not using function node at all.
sorry screenshots are from different flows, but you should use flow.yourname
Hi, how did you get that output?
This is my flow:
[{"id":"f0e4ec9b.c55fd","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"17f121a5.e5dcce","type":"inject","z":"f0e4ec9b.c55fd","name":"","props":[{"p":"payload"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"on","payloadType":"str","x":970,"y":160,"wires":[["fcb04c1c.2d1d5"]]},{"id":"e555f204.9b437","type":"debug","z":"f0e4ec9b.c55fd","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"true","targetType":"full","statusVal":"","statusType":"auto","x":1250,"y":160,"wires":[]},{"id":"fcb04c1c.2d1d5","type":"api-current-state","z":"f0e4ec9b.c55fd","name":"g mini","server":"46a5f96a.e810e8","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":false,"entity_id":"media_player.family_room_speaker","state_type":"str","state_location":"payload","override_payload":"msg","entity_location":"data","override_data":"msg","blockInputOverrides":false,"x":1120,"y":160,"wires":[["e555f204.9b437"]]},{"id":"46a5f96a.e810e8","type":"server","name":"Home Assistant","addon":true}]
This is the output I get:
