how to make smart doorbell like "RING" company

[arpit]

Can anybody please help me to figure out how to make a smart doorbell, what all equipment are needed, inshort i want to make a same doorbell as like RING doorbell.
I am 20 year old and does not have any electrical background but its just my startup idea and I genuinely want it to execute. please help me.
Thanks in advance.

[rstofer]

You can't possibly build one as cheap as you can buy one.  However...

I would use a Raspberry Pi with the Pi camera and WiFi.  I'm not sure where I would get the power.  If both sides of the 24VAC power are at the switch location, everything will work out fine.  Otherwise, I might have to fiddle with the existing wiring.

Then I would need some kind of power supply to take 24VAC and bring it down to 5VDC and not be totally inefficient.  Probably some kind of switching power supply.

ETA:  You might try to Google for Raspberry Pi Door Camera or something similar

https://www.bouvet.no/bouvet-deler/utbrudd/building-a-motion-activated-security-camera-with-the-raspberry-pi-zero