Help with automating ventilation

Kroeliemonster · July 2, 2019, 8:54am

Hi there, I would love to get some suggestions or solutions on how to properly automate my ventilation system. At the moment my ventilation is automated by using a humidity sensor in the bathroom and according to the %RH the ventilation is either on high, medium or off. This works fine but I want to add some functionality but I am unsure on how to properly add this to node-red.
My wishes are the following:

Override button to enable or disable medium ventilation (preferably linked to button on Lovelace dashboard)
Disable medium ventilation when one of my window sensors has status open
Disable medium ventilation if my bathroom sensor is within 5 %RH of my humidty sensor in the hallway
If at all possible I would love to set the %RH thresholds used for the switch node by separate inputs by using inject nodes for instance

Thanks

xx_Nexus_xx · July 2, 2019, 10:43am

Override button

you need to check the status of the override button after your humidity sensor
you need have another input trigger which is acting based on the even of your override button

Disable Medium ventilation

just check the window status before your ‘ventilation medium’ node , and block the message if the window is open

you can do the threshold handling within a function node in front of your switch and just return OFF,LOW,MEDIUM,HIGH as message for your switch

but as so often … this is just one approach and i’m sure there are lots of brilliant ideas arround

Kroeliemonster · July 2, 2019, 1:17pm

Hmm well that should help me along, not sure if I am able to write the function node and configure the other nodes you suggested with my lack of node-red or programming knowledge but it gives me some options to experiment with thanks.

xx_Nexus_xx · July 3, 2019, 3:13am

you can export and share your flow here … I’m sure somebody will be able to help you with the function node as it is a straight forward if-then code

Kermit · July 3, 2019, 4:53am

This is untested but might get you going in the right direction. I tried to build it without using any custom code. The switch is probably the most complicated part but it’s just a complex if statement. Also I don’t run any fans in my system so wasn’t exactly sure if you need to turn on the fan before setting the speed.

[{"id":"105c4277.96377e","type":"server-state-changed","z":"87dc7051.52b27","name":"Humidity Xiaomi","version":1,"entityidfilter":"sensor.humidity","entityidfiltertype":"exact","outputinitially":true,"state_type":"num","haltifstate":"","halt_if_type":"str","halt_if_compare":"is","outputs":1,"output_only_on_state_change":true,"x":112,"y":432,"wires":[["e5d9beca.7107c"]]},{"id":"e5d9beca.7107c","type":"api-current-state","z":"87dc7051.52b27","name":"Medium Disabled?","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":false,"entity_id":"input_boolean.fan_medium","state_type":"str","state_location":"fan_medium_disabled","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":522,"y":432,"wires":[["4070d96c.aa4d78"]]},{"id":"4070d96c.aa4d78","type":"api-current-state","z":"87dc7051.52b27","name":"high %","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":false,"entity_id":"input_number.fan_high","state_type":"num","state_location":"fan_high","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":482,"y":480,"wires":[["e8af8a5e.4bea38"]]},{"id":"e8af8a5e.4bea38","type":"api-current-state","z":"87dc7051.52b27","name":"med %","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":false,"entity_id":"input_number.fan_med","state_type":"num","state_location":"fan_med","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":492,"y":528,"wires":[["218a2955.5f7ae6"]]},{"id":"644f45ce.f858ec","type":"switch","z":"87dc7051.52b27","name":"","property":"payload","propertyType":"msg","rules":[{"t":"gte","v":"fan_high","vt":"msg"},{"t":"jsonata_exp","v":"(payload > fan_med or $abs((hall - payload)) >= (hall * 0.05)) and fan_medium_disabled = \"off\" and openWindows = 0","vt":"jsonata"},{"t":"lt","v":"fan_med","vt":"msg"}],"checkall":"false","repair":false,"outputs":3,"x":722,"y":480,"wires":[["56b593d4.e5860c"],["4e53ee08.2d13a"],["c82a0bc0.2fbf68"]]},{"id":"c82a0bc0.2fbf68","type":"api-call-service","z":"87dc7051.52b27","name":"Vent Off","service_domain":"","service":"","data":"","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":876,"y":528,"wires":[[]]},{"id":"4e53ee08.2d13a","type":"api-call-service","z":"87dc7051.52b27","name":"Vent Med","service_domain":"","service":"","data":"","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":876,"y":480,"wires":[[]]},{"id":"56b593d4.e5860c","type":"api-call-service","z":"87dc7051.52b27","name":"Vent High","service_domain":"","service":"","data":"","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":876,"y":432,"wires":[[]]},{"id":"218a2955.5f7ae6","type":"api-current-state","z":"87dc7051.52b27","name":"Hall Humidity","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":false,"entity_id":"sensor.hall","state_type":"num","state_location":"hall","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":502,"y":576,"wires":[["17175821.c012e8"]]},{"id":"17175821.c012e8","type":"ha-get-entities","z":"87dc7051.52b27","name":"Open Windows","rules":[{"property":"entity_id","logic":"includes","value":"sensor.window1, sensor.window2","valueType":"str"},{"property":"state","logic":"is","value":"open","valueType":"str"}],"output_type":"count","output_empty_results":false,"output_location_type":"msg","output_location":"openWindows","output_results_count":1,"x":512,"y":624,"wires":[["644f45ce.f858ec"]]},{"id":"db4d4c99.d07ac","type":"server-state-changed","z":"87dc7051.52b27","name":"Window Opened","version":1,"entityidfilter":"sensor.window1, sensor.window2","entityidfiltertype":"substring","outputinitially":false,"state_type":"str","haltifstate":"","halt_if_type":"str","halt_if_compare":"is","outputs":1,"output_only_on_state_change":true,"x":112,"y":480,"wires":[["8364f1e9.4c35d"]]},{"id":"8364f1e9.4c35d","type":"api-current-state","z":"87dc7051.52b27","name":"Humidity Xiaomi","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":false,"entity_id":"sensor.humidity","state_type":"str","state_location":"payload","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":288,"y":480,"wires":[["e5d9beca.7107c"]]}]

Forgot to state this requires you to make an input_boolean in home assistant for the manual control of the medium fan, this would allow you to control it from lovelace. Also need to make two input_numbers to be able to set the High and Medium thresholds from lovelace.

Kroeliemonster · July 3, 2019, 9:47am

Thanks that looks like a less complicated flow than what I came up with so far and I didnt even include all my functionality, I am kinda surprised its without a function node. Will take a good look at your solution when I have time and see where it gets me.

Kermit · July 4, 2019, 9:01am

Well here’s one with a function node then.

[{"id":"ebbf6d38.adfc6","type":"server-state-changed","z":"87dc7051.52b27","name":"Humidity Xiaomi","version":1,"entityidfilter":"sensor.humidity","entityidfiltertype":"exact","outputinitially":true,"state_type":"num","haltifstate":"","halt_if_type":"str","halt_if_compare":"is","outputs":1,"output_only_on_state_change":true,"x":144,"y":752,"wires":[["b2208856.8a8d18"]]},{"id":"f634acfd.10588","type":"server-state-changed","z":"87dc7051.52b27","name":"Window Opened","version":1,"entityidfilter":"sensor.window1, sensor.window2","entityidfiltertype":"substring","outputinitially":false,"state_type":"str","haltifstate":"","halt_if_type":"str","halt_if_compare":"is","outputs":1,"output_only_on_state_change":true,"x":144,"y":800,"wires":[["b2208856.8a8d18"]]},{"id":"4b858eac.d0fd9","type":"api-call-service","z":"87dc7051.52b27","name":"Ventilation","service_domain":"fan","service":"set_speed","data":"{\"entity_id\":\"fan.bathroom\"}","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":662,"y":752,"wires":[[]]},{"id":"f4d26c92.d14da","type":"function","z":"87dc7051.52b27","name":"","func":"const entities = global.get('homeassistant').homeAssistant.states;\n\nconst humidity = entities[\"sensor.humidity\"].state;\nconst disabled = entities[\"input_boolean.fan_medium\"].state;\nconst high = Number(entities[\"input_number.fan_high\"].state);\nconst med = Number(entities[\"input_number.fan_med\"].state);\nconst hall = Number(entities[\"sensor.hall\"].state);\n\n\nif (humidity > high) {\n    msg.payload = {\n        data: {\n            speed: \"high\"\n        }\n    }    \n} else if (humidity > fan_med && Math.abs(hall - humidity) > hall * 0.05 && disabled === \"off\" && msg.openWindows === 0) {\n    msg.payload = {\n        data: {\n            speed: \"med\"\n        }\n    }\n} else {\n    msg.payload = {\n        service: \"turn_off\"\n    }\n}\n\nreturn msg;","outputs":1,"noerr":0,"x":498,"y":752,"wires":[["4b858eac.d0fd9"]]},{"id":"b2208856.8a8d18","type":"ha-get-entities","z":"87dc7051.52b27","name":"Open Windows","rules":[{"property":"entity_id","logic":"includes","value":"sensor.window1, sensor.window2","valueType":"str"},{"property":"state","logic":"is","value":"open","valueType":"str"}],"output_type":"count","output_empty_results":false,"output_location_type":"msg","output_location":"openWindows","output_results_count":1,"x":336,"y":752,"wires":[["f4d26c92.d14da"]]}]

xx_Nexus_xx · July 4, 2019, 9:33am

@Kermit … well done

Kroeliemonster · July 5, 2019, 10:22am

Kermit:

[{"id":"ebbf6d38.adfc6","type":"server-state-changed","z":"87dc7051.52b27","name":"Humidity Xiaomi","version":1,"entityidfilter":"sensor.humidity","entityidfiltertype":"exact","outputinitially":true,"state_type":"num","haltifstate":"","halt_if_type":"str","halt_if_compare":"is","outputs":1,"output_only_on_state_change":true,"x":144,"y":752,"wires":[["b2208856.8a8d18"]]},{"id":"f634acfd.10588","type":"server-state-changed","z":"87dc7051.52b27","name":"Window Opened","version":1,"entityidfilter":"sensor.window1, sensor.window2","entityidfiltertype":"substring","outputinitially":false,"state_type":"str","haltifstate":"","halt_if_type":"str","halt_if_compare":"is","outputs":1,"output_only_on_state_change":true,"x":144,"y":800,"wires":[["b2208856.8a8d18"]]},{"id":"4b858eac.d0fd9","type":"api-call-service","z":"87dc7051.52b27","name":"Ventilation","service_domain":"fan","service":"set_speed","data":"{\"entity_id\":\"fan.bathroom\"}","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":662,"y":752,"wires":[[]]},{"id":"f4d26c92.d14da","type":"function","z":"87dc7051.52b27","name":"","func":"const entities = global.get('homeassistant').homeAssistant.states;\n\nconst humidity = entities[\"sensor.humidity\"].state;\nconst disabled = entities[\"input_boolean.fan_medium\"].state;\nconst high = Number(entities[\"input_number.fan_high\"].state);\nconst med = Number(entities[\"input_number.fan_med\"].state);\nconst hall = Number(entities[\"sensor.hall\"].state);\n\n\nif (humidity > high) {\n    msg.payload = {\n        data: {\n            speed: \"high\"\n        }\n    }    \n} else if (humidity > fan_med && Math.abs(hall - humidity) > hall * 0.05 && disabled === \"off\" && msg.openWindows === 0) {\n    msg.payload = {\n        data: {\n            speed: \"med\"\n        }\n    }\n} else {\n    msg.payload = {\n        service: \"turn_off\"\n    }\n}\n\nreturn msg;","outputs":1,"noerr":0,"x":498,"y":752,"wires":[["4b858eac.d0fd9"]]},{"id":"b2208856.8a8d18","type":"ha-get-entities","z":"87dc7051.52b27","name":"Open Windows","rules":[{"property":"entity_id","logic":"includes","value":"sensor.window1, sensor.window2","valueType":"str"},{"property":"state","logic":"is","value":"open","valueType":"str"}],"output_type":"count","output_empty_results":false,"output_location_type":"msg","output_location":"openWindows","output_results_count":1,"x":336,"y":752,"wires":[["f4d26c92.d14da"]]}]

Looks amazing, not even sure what I want to use. A pure node based flow makes it easier to see what is happening but a function node seems easier to understand for me.
Since the fan itself is connected to a Sonoff 4CH Pro R2 I need to use a switch behind the function node to call the correct turn on switch service.
Thanks again this made me understand more about node-red, and seems if you actually know how node-red works my wishes are easier to implement than expected.

xx_Nexus_xx · July 5, 2019, 10:32am

it will get easier with every flow you generate … but be careful as it is getting more and more complex with every flow

my light switch journey got crazy:

switch on/off a light via button
Added motion sensor to the flow
Added auto switch-off after specific time (if no new motion was detected)
Added alexa voice support
Added environment lightning check to the flow
Added scheduler to enable/disable light (e.g. dont switch on during day)
Added not-home feature
Added fake-presence (random light on/off when not-home)

Kroeliemonster · July 5, 2019, 2:09pm

Hmm I decided to use the node based flow atm, but ran into a problem with the JSONata Exp in the switch node. Seems $abs subtraction fails as it doesnt recognize payload or hall as a number. Tried to troubleshoot it but failed so far.
Also just noticed that the Open Windows node doesnt work in combination with my sensors, count stays at 0 even when opening windows.

[{"id":"df97dd1d.6fecb","type":"tab","label":"Flow 3","disabled":true,"info":""},{"id":"7224f560.5e184c","type":"server-state-changed","z":"df97dd1d.6fecb","name":"Humidity_Xiaomi","server":"ad59f2ad.671e2","version":1,"entityidfilter":"sensor.humidity_xiaomi","entityidfiltertype":"exact","outputinitially":true,"state_type":"num","haltifstate":"","halt_if_type":"num","halt_if_compare":"gte","outputs":1,"output_only_on_state_change":false,"x":80,"y":100,"wires":[["e72444ad.a74ab8"]]},{"id":"e72444ad.a74ab8","type":"api-current-state","z":"df97dd1d.6fecb","name":"Medium Disabled?","server":"ad59f2ad.671e2","version":1,"outputs":1,"halt_if":"","halt_if_type":"str","halt_if_compare":"is","override_topic":false,"entity_id":"input_boolean.medium_ventilation_on_off","state_type":"str","state_location":"fan_medium_on_off","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":550,"y":100,"wires":[["78598c07.936334"]]},{"id":"78598c07.936334","type":"api-current-state","z":"df97dd1d.6fecb","name":"high %","server":"ad59f2ad.671e2","version":1,"outputs":1,"halt_if":"","halt_if_type":"num","halt_if_compare":"is","override_topic":false,"entity_id":"input_number.vent_high","state_type":"num","state_location":"fan_high","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":510,"y":148,"wires":[["626dddfa.be4804"]]},{"id":"626dddfa.be4804","type":"api-current-state","z":"df97dd1d.6fecb","name":"med %","server":"ad59f2ad.671e2","version":1,"outputs":1,"halt_if":"","halt_if_type":"num","halt_if_compare":"is","override_topic":false,"entity_id":"input_number.vent_medium","state_type":"num","state_location":"fan_med","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":520,"y":196,"wires":[["5d1b1360.b9f85c"]]},{"id":"2169c31.436af3c","type":"switch","z":"df97dd1d.6fecb","name":"","property":"payload","propertyType":"msg","rules":[{"t":"gte","v":"fan_high","vt":"msg"},{"t":"jsonata_exp","v":"(payload > fan_med and $abs((payload - hall)) >= 5) and fan_medium_on_off = \"on\" and openWindows = 0","vt":"jsonata"},{"t":"lt","v":"fan_med","vt":"msg"}],"checkall":"false","repair":false,"outputs":3,"x":290,"y":440,"wires":[["411b69de.cb3338"],["ac0b8599.35dd48"],["b50200b1.f18fc"]]},{"id":"ac0b8599.35dd48","type":"api-call-service","z":"df97dd1d.6fecb","name":"Vent Med","server":"ad59f2ad.671e2","service_domain":"switch","service":"turn_on","data":"{\"entity_id\":\"switch.sonoff_1000739d8d_1\"}","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":520,"y":460,"wires":[[]]},{"id":"411b69de.cb3338","type":"api-call-service","z":"df97dd1d.6fecb","name":"Vent High","server":"ad59f2ad.671e2","service_domain":"switch","service":"turn_on","data":"{\"entity_id\":\"switch.sonoff_1000739d8d_2\"}","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":520,"y":420,"wires":[[]]},{"id":"5d1b1360.b9f85c","type":"api-current-state","z":"df97dd1d.6fecb","name":"Hall Humidity","server":"ad59f2ad.671e2","version":1,"outputs":1,"halt_if":"","halt_if_type":"num","halt_if_compare":"is","override_topic":false,"entity_id":"sensor.shelly_humidity","state_type":"num","state_location":"hall","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":530,"y":244,"wires":[["24b51272.46189e"]]},{"id":"24b51272.46189e","type":"ha-get-entities","z":"df97dd1d.6fecb","server":"ad59f2ad.671e2","name":"Open Windows","rules":[{"property":"entity_id","logic":"includes","value":"binary_sensor.openclose_5, binary_sensor.openclose_6","valueType":"str"},{"property":"state","logic":"is","value":"true","valueType":"bool"}],"output_type":"count","output_empty_results":false,"output_location_type":"msg","output_location":"openWindows","output_results_count":1,"x":540,"y":292,"wires":[["2169c31.436af3c"]]},{"id":"e3ae0334.1ccff","type":"server-state-changed","z":"df97dd1d.6fecb","name":"Window Opened/Closed","server":"ad59f2ad.671e2","version":1,"entityidfilter":"binary_sensor.openclose_5, binary_sensor.openclose_6","entityidfiltertype":"substring","outputinitially":false,"state_type":"str","haltifstate":"","halt_if_type":"str","halt_if_compare":"is","outputs":1,"output_only_on_state_change":true,"x":110,"y":160,"wires":[["9aefd6bc.4e58b8"]]},{"id":"9aefd6bc.4e58b8","type":"api-current-state","z":"df97dd1d.6fecb","name":"Humidity Xiaomi","server":"ad59f2ad.671e2","version":1,"outputs":1,"halt_if":"","halt_if_type":"num","halt_if_compare":"is","override_topic":false,"entity_id":"sensor.humidity_xiaomi","state_type":"num","state_location":"payload","override_payload":"msg","entity_location":"","override_data":"none","blockInputOverrides":false,"x":320,"y":160,"wires":[["e72444ad.a74ab8"]]},{"id":"b50200b1.f18fc","type":"api-call-service","z":"df97dd1d.6fecb","name":"Ventilation Switch 4 On","server":"ad59f2ad.671e2","service_domain":"switch","service":"turn_on","data":"{\"entity_id\":\"switch.sonoff_1000739d8d_4\"}","mergecontext":"","output_location":"payload","output_location_type":"msg","mustacheAltTags":false,"x":570,"y":500,"wires":[["63a035c9.f3bb7c"]]},{"id":"63a035c9.f3bb7c","type":"delay","z":"df97dd1d.6fecb","name":"","pauseType":"delay","timeout":"5","timeoutUnits":"seconds","rate":"1","nbRateUnits":"1","rateUnits":"second","randomFirst":"1","randomLast":"5","randomUnits":"seconds","drop":false,"x":760,"y":500,"wires":[["2b1131fc.3bce5e"]]},{"id":"2b1131fc.3bce5e","type":"api-call-service","z":"df97dd1d.6fecb","name":"Ventilation Switch 4 Off","server":"ad59f2ad.671e2","service_domain":"switch","service":"turn_off","data":"{\"entity_id\":\"switch.sonoff_1000739d8d_4\"}","mergecontext":"","output_location":"","output_location_type":"none","mustacheAltTags":false,"x":950,"y":500,"wires":[[]]},{"id":"ad59f2ad.671e2","type":"server","z":"","name":"Home Assistant"}]

Kermit · July 5, 2019, 6:27pm

For the windows state use a string comparison not a boolean. It checks against whatever the string value is in HA.

Can you show a full debug dump of the message object after the Open Windows node, mainly curious why the payload and such aren’ t numbers. A solution would be to wrap the variables in the JSONata expression with $number()

Kroeliemonster · July 5, 2019, 7:05pm

Yeah I managed to figure out that windows state part by myself and already changed it to exactly what you now suggested, glad I did that correctly.

The output is as follows:
object
topic: “sensor.humidity_xiaomi”
payload: 68.5
data: object
_msgid: “85a7fd88.30c47”
fan_medium_on_off: “on”
fan_high: 80
fan_med: 65
hall: 54
openWindows: 1

Kroeliemonster · July 5, 2019, 7:39pm

Seems the $abs cant read the payload, or at least when I test the JSONata exp in the switch it says
" The left side of the “-” operator must evaluate to a number" which is payload.
I just added a current state node that just outputs the humidity from the sensor to msg.bathroom and replaced “$abs((payload - hall)) >= 5” with “$abs((bathroom - hall)) >= 5” in the JSONata exp.

I also added a delay before the Open Windows node to make sure the count works when I deploy the flow after changes.

Another thing I noticed is that when the JSONata exp is false but the payload > fan_med, nothing happens but what I want in this situation is that the fan turns off. So I added an otherwise to the switch that does that.

jaycamcam · June 20, 2020, 6:25am

Do you mind sharing this part of your code?

Kroeliemonster · June 20, 2020, 2:28pm

payload > fan_med and $abs((bathroom - hall)) >= 7 and fan_medium_on_off = “on” and openWindows = 0

[{"id":"df30bd06.13a8d","type":"tab","label":"Flow 1","disabled":false,"info":""},{"id":"1a74bbc5.7bdfb4","type":"server-state-changed","z":"df30bd06.13a8d","name":"Humidity_Xiaomi","server":"ad59f2ad.671e2","version":1,"entityidfilter":"sensor.humidity_xiaomi","entityidfiltertype":"exact","outputinitially":true,"state_type":"num","haltifstate":"","halt_if_type":"num","halt_if_compare":"gte","outputs":1,"output_only_on_state_change":true,"x":80,"y":140,"wires":[["3ab32c9.b1389d4"]]},{"id":"3ab32c9.b1389d4","type":"api-current-state","z":"df30bd06.13a8d","name":"Medium 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