This is very neatly done and i'm in deep admiration of the quality. When i tried this back in 2011 with the GPIO pins on a Linksys WRT54G, the three biggest cha

This is very neatly done and i'm in deep admiration of the quality. When i tried this back in 2011 with the GPIO pins on a Linksys WRT54G, the three biggest challenges were: 1. Securing the device - which in practice meant all my hardware had to be mounted inside the property of the back of the front door 2. power supply - i battled with voltage sag due to the crap thin wires i used and the long run from the plug socket 3. The video resolution was terrible, to the point of not being useful at all It's interesting to me that in almost 10 years, only #3 is really "solved". 2 is arguably solved given the cheap high capacity lithium batteries available. My attempt back in 2011: https://postimg.cc/hfhyWGXZ https://postimg.cc/hfhyWGXZ https://postimg.cc/R6Rs961y https://postimg.cc/R6Rs961y Linksys WRT54G, I broke out the GPIO pins to service a microswitch on the letterbox and the doorbell button. A cheap USB "spy cam" from ebay with a resolution of around 20px x 20px. It looked horrendous despite my best efforts to mount it neatly. OpenCV existed at the time but wasn't available on this platform. Instead i read from /dev/video, converted the image to greyscale, then comparing pixel by pixel the luminosity vs. the previous saved file. If the cumulative value crosses a certain +ve or -ve threshold it treats it as motion detected - which turned out a terrible approach in practice :-)