A step sensor for less than a dollar (or even free!) (I was the first to post this!)
A delayer(to power your items for a given amount of time (the most simpe way possible)
And a ghoul grabber
That's right, you get 3 for the all low price a couple of dollars!
The step sensor is steps : 1-10
The delayer are steps: 10-15
The ghoul grabber is steps: 15-27