A small prototype which utilized a 3d printed latch to keep the door close, a solenoid to unlatch the door,a keypad to trigger the solenoid, a Hall Effect Sensor to determine if the door was open or closed, and a piezo to sound the alarm. Programmed an Arduino Uno in C++ using event driven code. Worked in a team of 3.
See the error page on Highlight: https://localhost:3000/1/errors/aFiIj827duJksVeJh5dnAmfcz106