Just tested this Wireless CO Natural Gas Sensor Leak Detector and confirm it works.
Got it from a local shop. You can find similar item in Aliexpress.
Received these today…
…and confirm all are working.
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I just want to add an issue with this sensor…
After using it for few months a couple of these sensors doesn’t send out any code when I close the door. Leave it for few more days and suddenly they work again. I am not sure is the sensor faulty or due to other reason. Anyone else having this issue?
Hello friend @masterkenobi i bought one yesterday , when it arrived , i will test sensor, after i said the results. But that happens with your 5 sensors? Or only one?
I sometimes leave a laptop nearby with a “codesniffer” (arduino with 433mhz running ReceiveDemo_Simple from RCSwitch) so I can see all the codes transmitted nearby. This is how I determine if it is due to distance, interference, or if it is not transmitting at all.
http://gearbest.com/access-control/pp_593452.html?wid=21
Works really well. Also has tamper feature. Using tamper feature as a toggle in home assistant. Differnt code is sent. Sensors stay on everyone’s night stand. Little squeeze of the sensor and toggle light off or on.
The other sensors from the security system should work as well.
I purchased all my bridge parts from gearbest including 433mhz receiver. The receiver covers my house if in the center . I can make it outside on one end that doesn’t have brick. I bought everyone they had. This one works best with loaded 433 antenna. Although not much better than just a piece of wire.
http://gearbest.com/transmitters-receivers-module/pp_530542.html?wid=21
http://www.elektor.nl/Uploads/Forum/Posts/How-to-make-a-Air-Cooled-433MHz-antenna.pdf
I should have dusted first.lol
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prahjister thank you for sharing that with us.Please post here all the sensors you have running.
http://gearbest.com/access-control/pp_593452.html?wid=21
This is the only sensor that I currently have. But i have this one on the way
http://www.gearbest.com/access-control/pp_593451.html?wid=21
Same manufacture…it will take 30 days. Only ordered 1 piece and free shipping. Will update once i get but i am sure it will work.
Just refer to this https://1technophile.blogspot.my/2016/09/433tomqttto433-bidirectional-esp8266.html
It works independently because it uses MQTT. That means, anything that can subscribe to the MQTT broker can make use of the 433Mhz signals it receives.
yes exactly. basically, you need to install an MQTT broker (server). It can be on the Pi or on any server. The 433toMQTTto433 gateway will receive signal from the sensors and then publish the signal code to the MQTT broker. Any computer (such as the Pi that runs HA) that subscribe to the MQTT topic can make use of it.
- the PI3 can only recieve if you connect a reciever to it.
- if you have MQTT installed you can use this way at any place you have wifi.
but it would be nice to discuss things like this at another place on the forum.
this is a list and discussions here make the list unreadable.
I ordered this and tested it yesterday:
It work like a charm, it’s a battery powered 433MHz remote with 1 to 3 touch button but in the shape of a wall switch.
It send an 433MHz signal whenever pressed. The quality is very good 
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Is it a toggle switch? Means does it send 2 codes per button?
wouldnt make sense to send 2 codes per button.
if it doesnt arrive at the reciever then the switch and reciever would be out of sink.
so it sends 1 code and the reciever goes on when its off and off when its on.
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Nop, it’s a simple push button, it send 1 code per button and the toggle is handle in HA.
I find it better this way, it won’t be disturb by interaction from other remote or change in HA web UI.
I use an automation to toggle light/switch/etc… when the button is pressed. For example:
automation:
- alias: Switch light 2
initial_state: True
hide_entity: False
trigger:
platform: mqtt
topic: home/433toMQTT
payload: 13210193
action:
service: switch.toggle
entity_id: switch.switch1
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these type of cheap 433 sensor, how many seconds passes betweer two triggers?
very nice design!
Same question for these: you know which is the minimum time between two triiger events?
I think there are around 10 seconds gap between each triggers.
The Cotech Smart Home Door Sensors are picked up, having some head scratching around the data being spit out of it, but its picking it up without issue.