Using a Particle Argon and a motion sensor I created a device that sends me a message whenever someone enters the house.

Home Security at the touch of your fingers! Get notifications when your house door is opened.

Use a Particle Photon to check the state of a gate/door. Use a PHP webpage to display it.

A small key box that could help Alzheimer patients families to identify the location, and the time when the key box gets opened.

Protect your family with latest and greatest door position sensing system!