Did I Lock the Door?

People will lock their doors when they leave their home or go to bed, however it's possible for people to forget leaving their homes open to unauthorised access. Or not remember if they locked it leaving them anxious to go home and check.

This project uses a magnetometer (digial compass module) with the MKR1000 (Arduino with WiFi) to build a small battery powered device that can be stuck to a door frame and detect if the door bolt is in the locked position.

If the bolt is not magnetic then ferromagnetic paint or ink can be added to the bolt which should be enough for the magnetometer to detect a change.

The device will be low power due to being able to switch off the wifi and put the zero into a low power sleep mode, which will wake up periodically to detect if the door lock status has changed.

Futher improvements will be to use pattern analysis to notify the user if they have not locked their door at a time when they usually would have.