Water level indicator.
https://drive.google.com/file/d/1oy0fzehjgiVoNu971BXuYJSIh2v Mq6D/view
Automatic fire alarm.
https://drive.google.com/file/d/1kMiLsY1oriRy2oebx d6SE4 NB4jFZfo/view
Automatic vehicle counter system.