There have been several project reports on similar projects. You can find them on the quick browse lists in the community – created wiki in the project report section on the list for alerts and notifications.
http://thingsthataresmart.wiki/index.php?title=How_to_Quick_Browse_the_Community-Created_SmartApps_Forum_Section#Quick_Browse_Links_for_Project_Reports.2FQuestions
And the Following thread goes through some of the most popular choices if you just want to jump to that one:
I’m trying to make (or buy) a device that acts as a battery powered LED notification signal light. Basically I want the light to turn or or green when I have mail (triggered by an open close sensor) and when I retrieve the mail I want the light to go out or change colors. This would be a tiny led like you find in the aeotec open close sensor when it changes state or in any computer that tells you when the processor is working - a 3mm led I guess? So extremely low power. I would drill a tiny hole in the mailbox and put the light through it. Any suggestions are appreciated, thanks.
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