Matthew and I are designing a MicroBit alarm that rings whenever strangers try to open the door. Our design requires at least a motion sensor and an alarm. If the stranger tried to open the door, the sensor would detect the movement of the door; subsequently, the alarm will ring. We design this for the security of our belongings while we are away from home. Hopefully, it would protect our house.

(https://gfycat.com/impolitetepidcrab-ambulance-siren-police-siren-emergency)

https://www.pinterest.ca/pin/320670435962578818/?lp=true