Digital Lock : Human Detecting Outdoor Lock

Abstract: This thesis considers a human detecting outdoor lock which can be controlled from a distance with the use of a web browser. Focus was on optimizing detection of possible visitors, i.e. eliminating non-human objects and people passing by with the use of a passive infrared sensor, an ultrasonic sensor and capture them on camera. A proposal of an algorithm and an actual implementation of it was made, taking the time a person is in the range of the sensors into account. Moreover, the position of the sensors were determined as well as the positionand angle of the camera which took a photograph when a visitor was detected. The results indicated on accurate detection of motionless bodies, including non-humans, and an accurate non-detection of bypassing objects. However, the process time varied due to measurement errors by the ultrasonic sensor. Thus in order to detect possible visitors more precisely, methods of eliminating non-human objects and ultrasonic sensor errors must be investigated further.