Garage Door Openers – I Can Not Imagine Life Without Them
A Garage door opener is a piece of equipment used for opening and closing garage doors. Most models are remote controlled. Garage door openers are simple but extremely useful devices. So much so, that its hard to imagine living without them now.
The first garage door opener consisted of a radio transmitter, a receiver and an actuator to open or close the door. In this the receiver would detect a change in the amplitude and would open or close the door. However there was a security concern with these kinds of garage door openers. They could be opened by anybody with a transmitter. Also there were accidental openings of garage doors by neighbors trying to open their doors. The later door openers used a shared frequency to overcome the accidental opening by other users. Using dipswitches a total of 256 combinations were made to prevent interference from other garage door openers. However the security issue was still not overcome.
The present day garage door openers use rolling frequency or hopping code technology. In these the frequency of opening is look ahead type, that means every time the door...
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