The front door of our building is constantly left open. I am trying to setup a system that detects when the door is open, and sends a notification if left open longer than some specific duration. A backend system that shows current status of door, and tracks times opened and closed.
I actually implemented a system completely, using an Arduino with Wifly shield and reed sensor ( https://github.com/ncoronges/DoorSensor935 ) - and it worked perfectly.. for about 12 hours :roll_eyes:
I failed to consider how little battery life I would get, esp with the wifly shield. I researched adding polymer lithium ion batteries but coming to the conclusion that battery powering this thing will be a pain no matter what, having to replace/recharge every few days..
Since there are many door sensor products out there ( eg. http://www.smarthome.com/59482/GE-45131-Choice-Alert-Window-Door-Sensor/p.aspx ), that use little power and communicate wirelessly, I thought it better to explore this route. To see if I could setup a receiver, and hook that into my arduino with wifly shield..
But how do you read the RF signals being transmitted from these door sensors? It seems there are door sensors that support zigbee but does anyone have experience with them out there, or know where to get ones that can be read by regular series 1 zigbee modules that work with arduino?
Thanks in advance.