Simple Light Controller

Inputs:

• 1-Wire Network
• Permanent 12v feed
• On/Off switch interface
• 1-Wire PIR pulsed input
• 1-Wire Twilight sensor input

Outputs:

• 12V to load

Timer Circuit

This kind of monostable multivibrator is called a one-shot. More specifically, it is a retriggerable one-shot, because the timing begins after the input drops to a low state, meaning that multiple input pulses within the delay period will maintain a continuous high output.

One application for a retriggerable one-shot is that of a single mechanical contact debouncer. As you can see from the above timing diagram, the output will remain high despite "bouncing" of the input signal from a mechanical switch. Of course, in a real-life switch debouncer circuit, you'd probably want to use a time delay of much shorter duration than 10 seconds, as you only need to "debounce" pulses that are in the millisecond range.

Reference

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• 555 circuits  http://www.uoguelph.ca/~antoon/gadgets/555/555.html