Abstract: Described herein are various embodiments of differential air pressure systems and methods of using and calibration such systems for individuals with impaired mobility. The differential air pressure systems may include an access assist device configured to help a mobility impaired user to stand in a pressure chamber configured to apply a positive pressure on a portion of the user's body in the sealed pressure chamber. The system may also include load sensors configured to measure the user's weight exerted inside and outside the chamber. The system may be calibrated by determining a relationship between the actual weight of the user and the pressure in the chamber, where the actual weight of the user may be measured by more than one load sensor and at least one load sensor is not in the pressure chamber.

Abstract: A garage door is controlled to open using an audio/video (A/V) recording and communication device. The device detects a vehicle within an area about the garage door and receives, using a camera, image data representative of an object associated with the vehicle. The device also compares the image data representative of the object associated with the vehicle with previously stored image data and identifies the object based on the comparing of the image data representative of the object with the previously stored image data. The device also authenticates an electronic device within the vehicle that is associated with the object by wirelessly communicating with the electronic device and determines, based at least in part on the authenticating of the electronic device within the vehicle, that the vehicle is an authorized vehicle. The device also transmits an actuation command to the garage door to cause the garage door to open.