If your doorbell is electric and plays a recording of chimes, it can be very straightforward to implement this yourself. Just off the top of my head I use FFTs

If your doorbell is electric and plays a recording of chimes, it can be very straightforward to implement this yourself. Just off the top of my head I use FFTs (fast Fourier transform) of a known recording of the door bell limited to certain frequencies, normalized etc and compare it to the audio stream. This can be done in real time without any hardware acceleration. You can also go a bit further and implement something similar to the shazam algo. If it's an "analog" door or a buzzer it will be trickier.