Detect if fridge door (contcat sensor) stays open

General
1

Hi,

typical problem (at least for me :slight_smile:): The fridge door stays open to long or is not properly closed.

My idea: Adding a contact sensor to the fridge door and create a simple flow which detects it and sends a warning to our google home.

I don't have the sensors yet, but already wanted to play around with a flow.

My first idea was super simple:

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The problem with this flow is, if the door is closed and opened while the delay is still active and stays open for a second after the delay is done, there will be a false alarm.

Another idea was this:

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This also doesn't work if multiple "CLOSE" and "OPEN" are send.

Does someone has an idea how I can implement such a behaviour?

2

I think "CLOSE" should always reset the timer and an "OPEN" should start a new timer from scratch so to say

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3

Would this work using trigger node? (tested only quickly but does was @krambriw suggested above)

[{"id":"a9682048.d1fef","type":"inject","z":"bf210454.b85538","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"open","payloadType":"str","x":90,"y":140,"wires":[["6664e7b7.ccf068"]]},{"id":"7319e2e7.1324bc","type":"debug","z":"bf210454.b85538","name":"","active":true,"tosidebar":true,"console":false,"tostatus":false,"complete":"false","statusVal":"","statusType":"auto","x":410,"y":180,"wires":[]},{"id":"575223cd.9cecfc","type":"inject","z":"bf210454.b85538","name":"","props":[{"p":"payload"},{"p":"topic","vt":"str"}],"repeat":"","crontab":"","once":false,"onceDelay":0.1,"topic":"","payload":"close","payloadType":"str","x":90,"y":220,"wires":[["6664e7b7.ccf068"]]},{"id":"6664e7b7.ccf068","type":"trigger","z":"bf210454.b85538","name":"","op1":"","op2":"DOOR ALARM","op1type":"str","op2type":"str","duration":"5","extend":false,"units":"s","reset":"close","bytopic":"all","topic":"topic","outputs":2,"x":240,"y":180,"wires":[[],["7319e2e7.1324bc"]]}]

I've setup the same thing for our freezer as my girlfriend often fails to close it properly. A Pushover message is then sent to both of our phones. :smile:

4

I tested this solution, but unfortunately this doesn't as expected.
If I send multiple "open", "close", "open", "close", I also receive multiple of them.

5

This works perfect for me. Thank you very much.

6

Great! Please mark the question solved so others don't need to check if there's still an open question. :slightly_smiling_face:

Edit: it was already handled.

7

Glad to see that your problem is solved. I can recommend the GS-WDS07 door sensors, they give an "open" and "closed" signal, not all door sensors do. They are 433 Mhz sensors.

8

Good to hear more endorsement for them as I have 5 of them on their (presently slow) way from China! The only door sensors that I have in use are two prohibitively expensive Z-wave ones from the beginning of my automation hobby. Besides them I have one of those frustrating single way only triggering sensors from Sonoff (useless).

9

Mine came from there too! :slight_smile: I was pleasantly surprised by how well they work.

10

This is more or less off topic, sorry!

@ghayne I received the door sensors today. My plan is to listen them using a Sonoff RF Bridge (flashed with Espurna).

I noticed the sensors send a rolling code but the last 6 digits seemed to be fixed for each event. Is this how you're interpreting the sensor/event or is there a fancier way?

11

I am using a RF Bridge flashed with Tasmota and get this in the console:

16:52:56 MQT: tele/rfbridge1/RESULT = {"Time":"2020-06-10T16:52:56","RfReceived":{"Sync":14080,"Low":490,"High":1350,"Data":"E07A0E","RfKey":"None"}}
16:52:59 MQT: tele/rfbridge1/RESULT = {"Time":"2020-06-10T16:52:59","RfReceived":{"Sync":14000,"Low":500,"High":1400,"Data":"E07A0A","RfKey":"None"}}

E07A0E is closed
E07A0A is opened

I use this change node attached to a MQTT in node subscribed to

tele/rfbridge1/RESULT

[{"id":"98294a1e.113d88","type":"change","z":"bfe6a9c4.a758a8","name":"","rules":[{"t":"move","p":"payload.RfReceived.Data","pt":"msg","to":"payload","tot":"msg"},{"t":"change","p":"payload","pt":"msg","from":"E6C60E","fromt":"str","to":"Front door is closed","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"E6C60A","fromt":"str","to":"Front door is open","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"E2CE0E","fromt":"str","to":"Back door is closed","tot":"str"},{"t":"change","p":"payload","pt":"msg","from":"E2CE0A","fromt":"str","to":"Back door is open","tot":"str"}],"action":"","property":"","from":"","to":"","reg":false,"x":480,"y":100,"wires":[["28a8d473.3f7e6c","ff568651.21b848"]]}]
12

Thanks! It seems Tasmota is smarter and can interpret the data. I believe E07A0x is the last part of the message. Espurna sends all the data as a single string like 36C401D60546E4050A. xxxxxE4050A is open, xxxxxE4050E is closed in the case of one of the sensors. I'll just create a switch with a "string contains" evaluation like I had to do with Sonoff PIR sensors. :+1: