Quote Originally Posted by skimask View Post
Wireless doorbell from Walmart or something... $10, runs for a couple of years off 2 AA's, range of a 100 feet or so. Mine was a bit loud, muffled it with duct tape internally (after all, what CAN'T duct tape do). And it has an on/off switch when I just don't want to listen to it.
Now THAT is simple.
But if you want to learn electronics, try a voltage divider.
http://www.pbpgroup.com/modules/wfse...p?articleid=25