Internet of things for a washing machine. Think of the time when you had to pay like $2.5 worth of quarters just to wash a towel. What if you can pay by the amo

Internet of things for a washing machine. Think of the time when you had to pay like $2.5 worth of quarters just to wash a towel. What if you can pay by the amount of laundry you have? Also, it would be great if it alerts my phone whenever the laundry is done so that I do not have to keep track of how much time it has passed.