| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide an automatic light turning-on or turning-off system in which a threshold value either at the time of turning-on light or turning-off light is automatically changed by a simple and low cost configuration in response to a preference of a user. SOLUTION: This system is provided with a memory circuit 2a (a memory means) for storing a threshold value either at the time of turning-on light or turning-off light, a manual operated SW input circuit 4 (a manual signal output means) for outputting either a manual turning-on light signal or a manual turning-off light signal when the light is turned on or turned off under a manual operation, and a comparing and judging circuit 2 (a processing means) for revising and registering a detected value sensed by a photo-sensor in the memory means as a threshold value at the time of turning-on light or turning-off light when either a manual turning-on light signal or a manual turning-off light signal is outputted from this manual signal outputting means.</p> |
