Product

The product is able to send messages to users when there is someone in the bathroom for every 10 minutes, after the person comes out, another message showing "Nobody is in the bathroom" will be sent to the phone. At current state, one thing needs improving is that the sensor is quite sensitive, it is very hard to find a time that it's value is "LOW", it can always detect a very small motion. And also, people need to switch off the device after the morning busy time, otherwise users will keep receiving messages. This is a half completed prototype since it cannot send instant status of the sensor, for the future design, I think it would be better if the device can send instant notification maybe by applying status change as data source. 

Part List:

1 x PIR sensor

1 x phone (could be any)

6 x Jumper Wire

1 x Particle Photon