My car has 4 power windows, and i'm trying to make a circuit that would roll down the window with just a touch of a button. I used a 555 timer monostable mode to create a logic latch for X amount of second which in turn drive a relay that give power to the window motor. Now I need a way to detect when the window motor is already fully down to avoid overload it (I might not even a need 555 timer). I know when the motor stops, current draw increases but i'm not sure how to build the circuit that can detect it. Is there a simplier way to detect an overload beside looking at current draw?