Making a timer card of Arduino Duemilanove

Using Arduino Project Guidance
1

I had a 1-day course in Arduino 3 years ago and haven't touched it since so this is really a beginner question. Is it possible to use Arduino as a "timer card"?

The problem:
I have a motion detection sensor which is set up at a busy street. When people pass by the sensor a couple of lights blink. All this is made through a device called ECUE, the sensor triggers the ECUE to send a signal to the lights. The problem is that in the ECUE device you can't delay the signal. This means that the light gets triggered each time someone pass by even if they pass a second from each other. I want the lights to blink through to the end which is approximately 30 sec before it's possible to trigger it again.

Is it possible to let the motion sensor to trigger the Arduino who then triggers the ECUE and the lights. Then program the arduino to ignore the trigger from the motion sensor for 30 sec before it can get triggered again?

2

Yes this sounds perfectly possible.

3

Simple question, simple answer 8)

Got any ECUE schematics, voltage levels, etc to work from?
Or do you just want to use an optoisolator to read the current and then use a relay to drive the desired output, keeps things all isolated?