When it comes to IoT development, the ESP32 microcontroller stands out for its impressive blend of power, versatility, and affordability. But you need to have electronics and programming skills, but nothing more. On the other hand, if they have these skills, they can do it themselves and simply buy the printed circuit board for their project here.
A PBX Server is required here to get full duplex audio. The door phone system could just as well be made into an intercom system. If they want to use a different microcontroller or a different function, they can simply email the principles and have a board designed.
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