Description: The Smart Door Mat system uses a large network of Sparkfun auditory and Adafruit PIR, or passive infrared sensors. In each room, sensors are connected to a Particle device which determines from readings whether there is a person present in the room. It uses the auditory sensors to detect noises that humans might make and uses the passive infrared sensors to detect motionless individuals. These Particles push their data via wi-fi to the Particle Cloud for safe keeping. Every 5 minutes, the Smart Door Mat contains another Particle which pulls the data via wi-fi from the Particle Cloud and analyzes it to determine whether an individual is at home. During the day, if someone is at home, the Mat emits a dark green glow to signal to a delivery driver “knock, there’s someone inside”. If no one is at home, the Mat emits a dark red glow to signal “stop, don’t deliver, there’s no one at home”. As a result, deliveries don’t get left vulnerable on a doorstep ripe for theft, and couriers don’t miss deliveries for people at home. Additionally, the Smart Door Mat acts as a home accessory, creating calm lighting for an upgraded welcome mat. 

Bill of goods: To properly equip a room with sensors, we need a single Particle device and battery pack ($40), along with two auditory ($7) and two passive infrared sensors ($8), which amounts to $60 per room. The Mat will contain a Particle device and battery pack ($40) along with several LED light strips ($10). The Smart Door Mat for a two-bedroom home will cost approximately $300.