INTEGRATED ENCLOSURE AND CONTROLLER FOR VIDEO SURVEILLANCE CAMERA

摘要

A controller for a video surveillance camera enclosure including a method an d apparatus for controlling a stepper motor by decoding a command for a specif ic camera action, setting the state of a state machine, and instructing a position control process and a speed control process based upon the state of the state machine. A drive signal is sent from said position control process to a motor current process and a phase control process to generate the curre nt and phase signals to control the stepper motor. The stepper motor drive current is preferably a non-linear current. The speed control signal include s ramp up and ramp down speed control for gradually increasing motor speed and gradually decreasing motor speed, respectively. Another aspect of the invention detects a plurality of pan and/or tilt positions to reset the pan and/or tilt motor step count to a known count associated with a known locati on without the need to pan and/or tilt past a preselected home position. Anothe r aspect controls a dome enclosure heater to operate over two different thermostat ranges to provide for manual de-fogging of the dome bubble.