I am trying to develop the circuit based on the input signal 10ms clock period signal, and the duty cycle I gonna use is 10% or 20%, which indicates if a user presses a button in the remote controller or not. When the duty cycle is 10%, the designed circuit output constant 0V; while when the duty cycle is 20%, the designed circuit generate another 10ms clock period signal with duty cycle 60%. I am thinking of using 555 timer but don't know where to start can someone guide me on this?