Folks, I am Deaf, I can't hear anything... so the smoke/CO alarm has built in the interconnect, I am going make the Nano to connect to the interconnect to make flash light or vibrate under bed etc.. So... my question any one know about the interconnect? And is what waveform of the interconnect if so? I saw online said 9V high to make alarm? does it has any signals such a data? THANKS!
Have you contacted the Alarm manufacturer, they may already have what you need.
That is a problem but I cannot help as I do not know what you have, there are many units that will fit your description. Also because of the livability I cannot answer but I do wish you luck.
The word interconnect has no meaning to me. Perhaps post a link to the actual device you want to modify.
My home has interconnected smoke alarms, 4 of them. If one detects smoke, they all make alarm sound.
I don't know what the signal is, but I don't think it will be anything complex, just a high or low signal (don't know what voltage).
Why not measure the signal from your smoke alarms with a multimeter? My guess is that there will be a high signal, perhaps 9V, from the alarm, until it detects smoke and then the signal will go low.
It should be ok to connect this to the input of an Arduino. You may need a voltage divider to reduce it to below 5V.
Modern smoke alarm systems, required for new builds, have a three-wire connection. Line, Neutral, and Interconnect.
I don't know what form the interconnect signal takes.
However, the OP would be well advised to simply purchase a compatible unit from the manufacturer that incorporates a strobe light - they're fantastically bright, are warranted to work with the same manufacturer's products. Yes, they're expensive, it's quite a racket, but on the other hand, they work.
The interconnect wire is red or orange and signals with a 9-12 volt level when smoke is detected.
A comparator like an LM311 with a MOSFET driving a strobe might be more reliable than using a micro-controller.
Thanks for all responds. I know what is the interconnect, I do have the strobe flash, I just want the interconnect into my Nano and I can make anything with it like vibrate under my bed and send network to send to my smart phone etc... so I guess I will have to use the scope to watch while it start alarm to see the waveform. thanks again.