Is there a zwave device similar to garage gate safety sensors?

project_sensors

#1

Hi There

Today I was observing the always super reliable and accurate sensors, which prevent the garage door from crushing someone. There is a receiver and a transmitter unit - they look like this:

I was wondering if there is a z-wave or wifi device that effectively does the same thing? I can think of so many applications for it, especially since it can be used outdoors in bright day light

Thanks


(Robin) #2

You could in theory take a regular laser trip sensor and connect it to ST via a dry contact Zwave sensor, but for such a safety critical role I wouldn’t reccomend it.

If you just want to use it for intruder / motion detection then it will work nicely.

Some people use two lasers to detect direction of travel.


#3

oh for sure, I wouldnt use it for Garage applications! I’m just thinking for other applications, like motion detection for narrow areas, that also work during day time. Can you recommend an example (link) of a low-cost dry contact zwave sensor, and provide more explanation on how something like this can be put together? thank you


#4

also what does dry sensor exactly mean?


(Robin) #5


(Robin) #6

What country are you in?


(Robin) #7

Some info here… 2nd and 3rd posts reccomend US options, then U.K. as per original post.


(Robin) #8

Basically, a dumb laser trip sensor will have a normally open (NO) or normally closed (NC) dry contact (non powered) output.

You can connect that output to a Zwave sensor, typically the door/window sensors, that have an option for a wired connection in addition to the built in magnetic reed switch.


#9

What you’re looking for is what’s called a “Break Beam Sensor”. Break beam sensors come in a couple configurations, either one sided or two sided. Two sided beam sensors need power at both sides of the sensor setup, one sided use a reflector at one side with the light source and sensor combined at the other side.

I’ve been using this beam sensor in combination with this Z-Wave dry contact module for a couple of years now. The setup is super reliable and fast to respond. The one-sided configuration prevents me from having to run wire all over the place but takes careful alignment during setup. We have a lot of pets in the house and normal PIR motion sensors are constantly being tripped by cats and dogs. With the beam sensor I can set a beam at chest level which will only be triggered by humans.

The only downside is that the sensor has a physical relay so it clicks every time it’s triggered which might be annoying in some use cases.


#10

thank you ! Do you have a simple wiring diagram for this? Wouldnt it be the same if i connected them to door sensors like this: https://www.youtube.com/watch?v=2z3810t3nbU . Also I live in a 220v area, would your beam sensors still work ? Also, are these the same as your beam sensors? (seem to be half the price and highly rated) https://www.amazon.com/Chamberlain-LiftMaster-Craftsman-801CB-Replacement/dp/B001JDG1KU/ref=sr_1_2?s=electronics&ie=UTF8&qid=1495922642&sr=1-2&keywords=beam+sensor


(Robin) #11

The video shows a motion sensor rather than a break beam setup. It’s a neat wireless setup though.

The cheaper model you posted above won’t be suitable for outdoor use, it’s intended to go on the inside of a garage door. It also requires power on both sides neededing extra wiring.

The one @luma linked to above needs power to just one side and is happy running off anything between 24-240VAC, so will be fine on 220VAC.

I’m in the UK and you actually reminded me I need to allow for this setup on a new build home I’m specifiying for family. I want to put a set across the front gate to turn driveway lights on etc.

I’m planning to use a pair of these mounted across the gate posts:

(Needs wires to both sides and I’m only using one pair, diagram shows two)

I’ll use a Fibaro Contact Sensor with dry contact input, connected to the ‘Control Unit’ output terminals.

Btw… the one @luma linked to would basically be wired like this: