| 摘要 |
An improved irrigation control apparatus for use in controlling an irrigation valve. The apparatus includes a soil moisture sensor for generating an output signal indicative of the soil moisture level. The output signal is sent to a control unit that inhibits valve operation if the soil is considered wet. The control unit has a control circuit that applies a relatively short duration power pulse to the sensor to obtain a moisture reading during the pulse. In addition, the control unit includes display lights which are part of a manually actuable test circuit that displays a wet or dry soil indication received from the sensor.
|
