I'd like to use my arduino to track the state of my garage door (opened or closed). I'm wondering what type of sensor(s) I should use. I'd like to be able to query the device to determine the door state.
At one point I thought I read about someone using magnates (one one the device and one on the door rail) but I can't find it again.
Thank you for your response! I figured there were many ways to do this but I'm totally new to the Arduino stuff and didn't know if there was a canonical way to solve this problem. If you were going to do this what method would you use?