can i triggerred a reset with a sensor??

sorry if my english are bad

i want to reset the arduino but i want to triggerred the reset with a sensor
the sensor is triggerred but it doesn't resetting please help me

Here's a video that uses a watchdog timer to trigger a reset. It may provide some assistance.

SuperHouse TV Watchdog Timer

Why reset the Arduino?

The reset pin needs to be pulled down for a short while to force a reset - what is this
sensor? Does its output pull down?

i want to using pir sensor as a triggerred to reset the arduino

Well have you found one that has a active low output?

fadeel:
i want to using pir sensor as a triggerred to reset the arduino

Why? What will resetting the Arduino accomplish? Whatever you think will be accomplished can be accomplished in other ways.