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Author Topic: Securifi SZ-PIR02 design flawed?  (Read 9605 times)

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Offline Fire69

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Securifi SZ-PIR02 design flawed?
« on: February 23, 2015, 11:39:46 am »
Hi,

I was testing the Securifi SZ-PIR02 that was delivered together with my Almond+ and either my logic is flawed, or the sensor's design is...

When it detects motion, the led goes on for 1 second and it sends a 'motion' signal to the Almond+.  So far nothing weird. But...
When the led goes out, it immediately sends a 'no motion' signal!
That's not supposed to happen, is it?

I set up a rule:
If motion - light on.  Works OK (little slow, 2 second delay...)

I set up another rule:
When no motion - wait 60 seconds - light off

The problem now is that it turns on the light and 60 seconds later, the light is turned off. Even is motion is detected at that moment, resulting in a light turning off and immediately back on!  :o

Do all PIR sensors work like this, or is something work with the Securifi sensor?

Offline mparadis

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Re: Securifi SZ-PIR02 design flawed?
« Reply #1 on: February 23, 2015, 01:07:19 pm »
I think they all work this way. Mine, not Securifi branded, work that way too.

Offline Fire69

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Re: Securifi SZ-PIR02 design flawed?
« Reply #2 on: February 23, 2015, 01:45:40 pm »
Weird...
Wouldn't it be more logical if they send the 'no motion' at the preset detection interval?

So how do you go about making rules for controlling a light with a motion detector?

Offline mparadis

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Re: Securifi SZ-PIR02 design flawed?
« Reply #3 on: February 23, 2015, 06:12:25 pm »
Most PIR sensors can't detect motion again for a set period of time. I am not sure what Securifi's is. This is normal so that you don't waste a ton of battery and don't get motion activations every second. Mine are 4 minutes so my lights turn off after that period runs out. By then I can turn the lights on manually (through the app not through rules) if I need them or let them go off if I don't.

Offline Fire69

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Re: Securifi SZ-PIR02 design flawed?
« Reply #4 on: February 24, 2015, 02:22:56 am »
Most PIR sensors can't detect motion again for a set period of time. I am not sure what Securifi's is. This is normal so that you don't waste a ton of battery and don't get motion activations every second. Mine are 4 minutes so my lights turn off after that period runs out.

That's totally logical and how Securifi's sensor should work too, but it doesn't...
There is a selectable interval on the sensor, 5 seconds to 3 minutes, to set 'redetection' interval.
Mine is set to 1 minute, and when it detects motion, it does wait 1 minute before detecting again.
But.... when it detects motion, it sends a 'motion' signal and IMMEDIATELY after that, it sends a 'no motion' signal.
And after 1 minute, when it should redetect if there is motion, it does NOT send anything when there is no motion.

You get the problem?  :)

Quote
By then I can turn the lights on manually (through the app not through rules) if I need them or let them go off if I don't.

That's ok for a living room or bedroom or whatever, but I'm using it in the bathroom (toilet only) and I want it to turn on when you enter and turn off automatically after you leave.  :)
That is working now, if you don't stay in there longer than 60 seconds, otherwise the light starts going on and off.  ::)
« Last Edit: February 24, 2015, 06:24:10 am by Fire69 »

Offline coderunner

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Re: Securifi SZ-PIR02 design flawed?
« Reply #5 on: February 24, 2015, 09:27:13 am »
Consider adding a door sensor.  Don't turn the light off until the door is opened.

Offline Fire69

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Re: Securifi SZ-PIR02 design flawed?
« Reply #6 on: February 24, 2015, 09:31:34 am »
How would that work?  Door opens => light on, door opens again, light goes off. Can you do that in rules?

Offline fillibar

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Re: Securifi SZ-PIR02 design flawed?
« Reply #7 on: February 24, 2015, 10:21:32 am »
I would think you could have the light be part of the conditions. If the light is off and the door opens, turn the light on. If the light is on and the door opens, turn the light off.
Almond 3 mesh handling the home.

Offline mparadis

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Re: Securifi SZ-PIR02 design flawed?
« Reply #8 on: February 24, 2015, 11:33:06 am »
Interesting. Try not using the no motion part, i.e. whenlight isn't off and motion is sensed turn on light then wait x minutes then turn off. Bypassing the no motion. Not ideal but perhaps a temporary work around.

Offline coderunner

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Re: Securifi SZ-PIR02 design flawed?
« Reply #9 on: February 24, 2015, 01:36:09 pm »
How would that work?  Door opens => light on, door opens again, light goes off. Can you do that in rules?

I was thinking that you could use the motion sensor to turn the light on (if the door is usually open when the room is not in use).
Yes the light state would have to be used in the condition.  If light is on and door opens, turn light off. 
If you wanted to use only the door sensor, I recommend as fillibar suggested.

Offline Fire69

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Re: Securifi SZ-PIR02 design flawed?
« Reply #10 on: February 24, 2015, 02:45:34 pm »
Interesting. Try not using the no motion part, i.e. whenlight isn't off and motion is sensed turn on light then wait x minutes then turn off. Bypassing the no motion. Not ideal but perhaps a temporary work around.

That's how I have it set now.
1 rule:
Motion > light on > wait 120sec > light off.

If you need to go number 1, that's fine.  For number 2 it's a bit short and you end up sitting in the dark  ;D

I was thinking that you could use the motion sensor to turn the light on (if the door is usually open when the room is not in use).
Yes the light state would have to be used in the condition.  If light is on and door opens, turn light off. 
If you wanted to use only the door sensor, I recommend as fillibar suggested.


It's a toilet in the downstairs hallway so the door is always closed.
IMHO, attaching a doorsensor in a toilet is a little over the top, so I'll just wait until they fix this strange behaviour :)

Offline coderunner

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Re: Securifi SZ-PIR02 design flawed?
« Reply #11 on: February 24, 2015, 04:25:34 pm »
attaching a doorsensor in a toilet is a little over the top

Lid open - light on  :)

Offline Fire69

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Re: Securifi SZ-PIR02 design flawed?
« Reply #12 on: February 24, 2015, 04:27:15 pm »
 Lol, that would be hilarious! ;D

Offline Ohiomedic

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Re: Securifi SZ-PIR02 design flawed?
« Reply #13 on: February 24, 2015, 06:56:08 pm »
That's how I have it set now.
1 rule:
Motion > light on > wait 120sec > light off.

If you need to go number 1, that's fine.  For number 2 it's a bit short and you end up sitting in the dark  ;D

It's a toilet in the downstairs hallway so the door is always closed.
IMHO, attaching a doorsensor in a toilet is a little over the top, so I'll just wait until they fix this strange behaviour :)

If I wanted to automate the lights in my bathroom I'd probably go with the door sensor if the door is always closed. Just seems better price wise since you can get two of the trippers for $40, cheapest motion detector I've seen is $30. Also seems like motion detector take a little longer to trigger then the door sensor.

Offline Fire69

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Re: Securifi SZ-PIR02 design flawed?
« Reply #14 on: February 25, 2015, 04:58:53 am »
If I wanted to automate the lights in my bathroom I'd probably go with the door sensor if the door is always closed. Just seems better price wise since you can get two of the trippers for $40, cheapest motion detector I've seen is $30. Also seems like motion detector take a little longer to trigger then the door sensor.

Got a link to those sensors?
Unfortunately, I'm in Europe and everything is way more expensive over here  :(

 

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