Time controlled light dimmer

G - Physics – 08 – G

Patent

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Details

315/1, 342/19

G08G 1/00 (2006.01) H05B 37/02 (2006.01)

Patent

CA 1221440

ABSTRACT A method and apparatus for dimming traffic lights during hours of darkness to conserve energy. Electronic circuitry provides storage for weekly tables of twilight times for particular geographic locations covering an extended time period, such as one year. Counting apparatus counts weeks for addressing the stored tables, and an AM/PM indicator further differentiates between stored sunrise and sunset times. The stored time is compared in a comparator with the present time, and logic circuitry, responsive to the AM/PM indicator, reacts to the results of the comparison by activating and deactivating a dimmer for the traffic lights.

419189

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