Reddit reviews First Alert RM4 Smart Relay
We found 3 Reddit comments about First Alert RM4 Smart Relay. Here are the top ones, ranked by their Reddit score.
Activates auxiliary devices when alarm device soundsWorks with compatible BRK and First Alert smoke, heat, and carbon monoxide detectors120V AC poweredEnhances the effectiveness of your detector alarmGreat for adding a strobe light, siren, bell, door closer, or similar deviceFaster turnarounds on job sites with the easy-to-install, most-trusted alarms in home safety
This is the polar opposite of SMD, but I thought I'd share my solution...
While I love DIY, smoke detectors are important. I wanted to interface with my home system but without compromising the integrity of the system.
Get a 120v first alert.
First Alert SA521CN Wireless Interconnected Hardwired Photoelectric Smoke Alarm with Battery Backup https://www.amazon.com/dp/B000EVO9D4
Get the smart relay interconnect.
BRK RM4 Smart Relay for First Alert https://www.amazon.com/dp/B0039PF21U
This includes schematic for wiring to the detector and the color codes for NO/NC relay connection.
~~Get an optocoupler or isolation relay. Mains Voltage! The output of the RM4 is 120V.
Enclosed AC/DC Power Relay with Protection & De-Bounce. Screw Terminals. 120V Trigger Input. https://www.amazon.com/dp/B017743I7S
The RM4 output powers the relay. The screw terminals connect to the 8266.~~
Get a Esp8266; Flash tasmota firmware. Configure for switch and mqtt. Wire it up.
First Alert is now part of the matrix.
Quick update: Did not need the second relay/optocoupler. The BRK RM4 is an isolated relay. Their docs did not make that perfectly clear so I assumed worst case w/o testing it.
I was able to connect my hardwired smoke detectors to my SmartThings system with a BRK RM4 Relay. I installed it in the junction box behind the detector in my basement. When the alarm sounds it will open its switch. By connecting this switch to the auxiliary contact terminals on a door sensor mounted nearby, my HA system knows that the alarms are sounding. This should also work with any other hub that supports a zwave door switch (read: all of them.)
Here's the magic:
BRK RM4 Smoke Alarm Accessory Relay https://www.amazon.com/dp/B0039PF21U/ref=cm_sw_r_other_awd_-HVLwb9C5KFTY
And the door switch I'm using:
Ecolink Z-Wave Door/Window Sensor (DWZWAVE2-ECO) https://www.amazon.com/dp/B00HPIYJWU/ref=cm_sw_r_other_awd_qKVLwbPRVRM5Y
First setup heater mintemp in the firmware:
http://forum.seemecnc.com/viewtopic.php?t=9763
For added protection I have a smoke detector in the cabinet connected to a relay which cuts the power if the detector goes off:
https://www.amazon.com/BRK-Brands-RM4-Smart-Relay/dp/B0039PF21U