I have an idea about using an old phone to tell me the temperature at a remote location. I need to know when a greenhouse or any remote location approaches freezing by sending an alarm to my computer or another Android phone. I thought about something similar to remote GPS locating but getting the temperature data instead of the GPS data. I could just leave my old Android phone in the Greenhouse. I know absolutely nothing about App development, I started to look at the SDK but first I needed to know Java, BASIC is as far as I ever got on a BBC.