Security lighting system

Details Security lighting system Security lighting system

1988-06-09

1990-02-20

Shoop, Jr., William M.

Electrical transmission or interconnection systems

Switching systems

Condition responsive

307141, 3071414, 315159, 315360, H02J 700

Patent

active

049029061

ABSTRACT:
A security lighting system for automatically connecting and disconnecting a plug connected to electric power to an electric outlet connectable to an electric appliance includes a photodetector circuit, a microcomputer, and a switching device. The photodetector circuit senses the level of ambient light and generates a light signal. The microcomputer is controlled by a stored program for sampling the light signal from the photodetector circuit only between a first predetermined time of day and a second predetermined time of day. The switching device is responsive to the light signal for selectively connecting the plug to the electric outlet when the ambient light level is below a certain level between the first and second predetermined times of day and disconnecting the plug from the electric outlet when the ambient light level is above the certain level between the first and second predetermined times of day, as well as throughtout the remainder of the day regardless of the ambient light level.

REFERENCES:
patent: 4002925 (1977-01-01), Monahan
patent: 4229664 (1980-10-01), Blake et al.
patent: 4354120 (1982-10-01), Schornack
patent: 4362970 (1982-12-01), Grady
patent: 4451763 (1984-05-01), Sodini
patent: 4568868 (1986-02-01), Schlepp et al.
patent: 4575659 (1986-03-01), Pezzolo et al.
patent: 4587417 (1986-05-01), Duve et al.
patent: 4766331 (1988-08-01), Flegel et al.

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