The necessary equipment for this project is relatively inexpensive:
A RaspberryPi3 with 32 GB uSD card and Playstation3 Eye USB camera
TOTAL COST: ~ US$80! For comparison, a DropCam from Nest (aka Google) is ~ US$199.
- RaspberryPi3 ~ US$45.00
- Enclosure, uSD card, power-supply ~ US$30
- Playstation3 Eye camera ~ US$5 (WOW!)