US 4,061,927 A · Timing system for watering devices

Abstract

An electronic timing system for controlling a plurality of electrically controlled watering valves comprising a free running multivibrator circuit having a plurality of individually adjustable resistor-capacitor circuits for controlling the frequency. A divide-by-N counter, when filled, controls a stepping counter for successively activating different ones of the valves and, in turn, selects different ones of the resistor-capacitor circuits to control the time each of the valves is activated. Operation of the multivibrator circuit is initiated by a clock operated day-of-the-week counter having pre-settable switch means for enabling or disabling operation of the multivibrator circuit during any selected day. A repeat cycling control device is provided to selectively cause repeated cycling for different numbers of times and a delay device is provided to delay repeat cycling for different time periods.

Claims10

Dependent claims

A timing system for a plurality of electrically controlled watering devices comprising,

means for producing repetitive pulses,
a plurality of normally disabled frequency control devices for controlling said means to produce pulses of different frequencies,
means for manually preconditioning said control devices for selected frequencies,
means for initiating operation of said pulse producing means,
a divide-by-N counter for counting said pulses and effective to produce an output signal upon registering N pulses from said pulse producing means,
an electronic switching device having a plurality of outputs for connection to respective ones of said watering devices,
said switching device comprising means controlled by said output signals for applying energizing signals successively to different ones of said outputs whereby to energize respective ones of said watering devices;
and
means responsive to said energizing signals for successively enabling different ones of said frequency control devices to control said pulse producing means.

6 more elements

Dependencies are inferred from the claim text.

Timing system for watering devices

Life of this patent

Timing system for watering devices

Life of this patent

Abstract

Claims10