1. Provide an overview of
Automated control.
Automated control is the
mechanised command of a task or tasks. The machines controlling the operations
are most often computers using programmes that provide instructions or step-by-step details of how to produce the needed output.
2. Provide an overview of
Traffic Light sensing devices and relevant pictures (p. 260)
Automatic opening and
closing of doors require both sensors to detect the
movements and actuators to open the doors, that is, motors to carry out the
tasks. There are a range of sensors depending on the cost of the system: motion
sensors use infra red beams to detect when
the beam is broken, pressure sensors are used under mats and activate a
switch when weight is applied to the mat either side of the door. The doors
will respond when movement occurs using actuators such as pneumatic motors
driven by compressed air that spin at a very fast rate and respond quickly.
Traffic light systems use
computer tracking to automate their operation. SCATS monitors traffic signals.
Input comes from sensors installed under the road surface. Vehicles travelling
over the sensors are counted and the traffic signals changes to meet the
traffic conditions. The sensors are wired loops containing a magnetic field. A
vehicle travelling over them disturbs this field.
3. Provide an overview of
actuators and sensors to open and close doors. Please add relevant pictures.
(p. 261)
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