I've had a weather station for several years, but over time things started to fail. The last thing to go was the indoor display, and it was going to cost me $150.00 for a new one. With my interest in Arduino it was a no-brainer to make my own weather station.
A Letta - Lerta is a device that alerts you to when there is mail inside your letterbox. We have a long driveway with a bend in it, so we can't see the letterbox. I decided that rather than walking down there several times on mail day to check the box I needed to come up with an electronic solution, and so the Letta - Lerta project was born.