Hope can help with a idea i have for make a solution of my trouble. I have a normal doorbell, but wanna make a replicate of the sound using arduino or something similar for mirror the sound in another place of my home where is not listened. Any suggestion? for try to transfer from analog sound of doorbell with arduino to the another place using a wifi module or something? the idea is not using large cables extensions for this.
This is one of my back-burner projects.
Here is my design theory:
Basically I would use a Wemos D1 Mini or NodeMCU processor board located at the transformer.
A 110V to 5V voltage adapter would power the Wemos.
The transformer secondary would go through a full-wave rectifier and RC low pass filter to make a DC voltage. That DV voltage would be lowered to 3V using a simple voltage divider, then into the analog input of the Wemos. The theory is that when the doorbell is energized, I would be able to detect the slight voltage drop.
The event would be sent to my Home Assistant server using MQTT. Home Assistant would then send the chile to all of my Amazon Echo devices. You could also use ESP-Now for point-to-point connection.
In theory i need a regulator from AC to DC to 3v? i see connector bell transformer use 12-16V AC from there i need regulator to 3V and going to arduino? is like when the bell is activated send signal to arduino and get the info , is something like this?
OK, so you apparently want to detect the chime tones and mirror them to another station by wireless rather than properly wiring them. I would note that you can get flat cable to run under carpets, skirtings or wallpaper, even paint.
The chime signal here is an audio signal with a variable volume, it is not going to be entirely easy to reliably detect and it is not referenced to either side of the transformer AC as that is passed through a bridge rectifier.
In any case, you are going to need a number of components but I suspect the easiest will be to forget Arduinos (despite the common meme that an Arduino is the solution to every problem ) and connect a "Video sender" (using the audio only) with its own power supply to the door phone master unit (are there actually any slaves connected?) and a "video receiver" with a small amplified speaker where you wish to hear the chimes.
If you are particularly clever, you could probably use an isolation transformer at the master phone to obtain power for the video sender (or whatever other system you devise to detect the chimes).
You may want to check out this library: Google Home Notifier. I used this library recently in a project , https://github.com/GaryDyr/Sump-Pump-Info_Project to announce sump pump high water level alarms on our Google Home MIni from an ESP32. The project goes way beyond your need, but the use of the notifier library is a straightforward way to send some sort of announcement to a Google Home device. As long as the ESP is on the same lan as the Home Mini, the library works great. The library won't help you with an Amazon Echo though.
In the feed to the door bell an ac current passes when the bell is pressed . I put a resistor in this lead to drop 2v when the bell operates . In parallel with that I put a resistor and opto isolator , with a diode across the opto to pass the reverse current .
I then had an opto isolated signal I could use .
You could then just fire a mono stable with that to your extra sounder .
I use this to operate a sounder in the garden .
Getting Alexa to respond is difficult as the message has to go somewhere into the ether via the internet to return to Alexa …. Guess it can be done , but this is only a doorbell !!