| 摘要 |
A garden watering controller 1 for operating a valve 33 for controlling a supply of water into a garden watering arrangement comprises a light sensor 21 for sensing ambient light levels and a central unit 22 for receiving sensed light level signals from the light sensor 21 and for outputting control signals for operating the valve 33 in dependence on the sensed light level signals. The central unit may be arranged to determine the occurrence of dawn and dusk. |
