Looking for a low cost "dry" contact sensor using Zigbee or Z-wave plus for HE

[user494]

@jvm33

Aoetec Sensor 7

For $45 - I can buy 4 Sonoff ZBminis! Since my applications has 110 VAC power for the Seco-Larm then I would need to buy an additional power supply for the battery operated, contact sensor to
add more reliability to my system. Since this Seco-Larm is picking up only sidewalk visitors then it is a non-critical security warning sensor/device.

[dylan.c]

Might also consider adding one of these to your order.... just in case

SONOFF SNZB-04 ZigBee Door Window Contact Sensor Internal

Finally received my SONOFF SNZB-04 ZigBee Wireless Door Window Sensor ON/ OFF Sync Status on e-WeLink Smart Home Security Works with ZigBee Bridge and got to take it apart and see what's under the hood. Actually came very quick, under 2 weeks with cheapest shipping from AliExpress SONOFF Factory Store, not counting on that to happen again though. My hope is that these will be a less expensive hacking option than the more feature rich($$) SmartThings contact sensors. "Dry Contact Sensor" Turns …

[user494]

Cheaper is better if it works. When I find something cheap that works reliability then I buy in large quantities to save money.

[PunchCardPgmr]

Visonic Contact sensors

Hi. The compatibility chart shows MCT-340 E, MCT-340 SMA as omcpatible devices. Anyone know if the 350s are compatible. Perry good lot sale on ebay. XFINITY Security XHS2-TY MCT-350 ZigBee Wireless Door Window Sensor LOT OF 10 47 dollars. Not a bad deal if they work. Tanks Mac

Cheap and easy to solder a set of wires to each side of the switch and use as desired.

There's a handful of threads showing details of how to do this to a couple of different vendor's contacts.

[bctrips]

Adding to this older thread on a low cost solution ($3-$6) for a Zigbee Dry Contact Input. I'm using a Water Sensor with a Remote Sensor. I cut the end of the sensor off and soldered the lead ends (note the wires are thin, like 24awg). I changed the Device Type to a Zigbee Contact Sensor and when the leads are touching the device shows closed, when not touching the device shows open.

Tuya Zigbee Water Sensor Alarm Water Leak Detector Flood Alert Overflow Security Alarm System Works With Zigbee Gateway

[2ac16mo]

@brad5

t's r

I have one in use and it works great.

[JJackson75080]

Virtually any water leak sensor that has two metal contact points is looking for a change in resistance to trigger the sensor. I clip the sensor off and take the two wires and use them as contact closure sensors for relays and such. As an example my home alarm system 12vdc output to the siren is tied to a 12vdc relay. If energized it will short the two wires giving me a "wet" trigger, HE then sends me a text to let me know that my alarm siren is active. Really inexpensive and been using them for this type of application for years successfully. Hope that helps j

[Bloodtick_Jones]

@aaiyar

Ecolink zwave plus contact sensors have dry contact terminals.

Second vote for this device. Long battery life, simple screw contact inside the case, and is easy to add/remove to Z-wave. On Amazon here.

[bbrannon]

I use the ThirdReality zigbee water leak sensor as a dry contact sensor. Connect your switch contacts to the existing external screws and you are good to go. AA battery provides more than a year of service.

[Hal3]

@user494

Cheaper is better if it works. When I find something cheap that works reliability then I buy in large quantities to save money.

Exactly! I have boxes of stuff saving me money right now!

[Sevilsivle]

Don't we all!