Timed Temporary Grounding Circuit

Hi everyone.

I need your help with a project. I have a basic idea of the components involved, but I am stuck on how to do a certain step.

The circuit that I am designing must have three functions;
1) When a button is pressed, the circuit must ground another circuit.
2) After grounding circuit 2 for a certain amount of time, circuit one shuts down and allows circuit 2 to start again.
3) Circuit 1 repeats only once when a trigger button is pushed.

I knew that I would have to use a 555 timer to control the timing function of the circuit and a transistor to control the grounding function, but what I have no idea how to do is to make the timer only cycle high once.

Sorry if this is a ridiculously easy question for most, but I'm currently taking a class called Project Lead the Way: Digital Electronics and I'm trying to learn all that I can. My knowledge is pretty limited so far; all we have covered in this class is breadboarding simple circuits, 555 timers, adders, and other simple, basic functions.

Thanks for reading,

Cal

 

Don't connect the discharge pin to the timing network and have the "start" button force a reset.