On Fri, 12 Feb 2010 13:30:00 -0500, "Matt Williamson"
wrote:

[snip]

I'd use a spring switch with a top plate that covers the bottom of the
mailbox. Make sure the spring is strong enough to hold the plate up but any
additonal weight will trip it. Use a battery to light the led, put the
switch in between the led and battery. When there is mail, it will trip the
switch and light the LED. When you remove it, the spring will will push the
plate up and it will go off. You'll probably need a resistor between the
battery and LED depending on what type of LED you use.

HTH

Matt


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