I'm trying to make a circuit that measures the period of a signal, ranging from 1ms to 10sec. Can you give me any ideas ? I have an idea, using 1kHz clock signal and some decade counters, but i need something to tell me when has elapsed one period of the unknown signal, so i should stop counting and display the time. Apparently using a trigger won't do it, since it will divide the frequency and i'll be measuring twice the period. Is my idea even close to the solution ? I'm a bit confused, and I don't have any experience with digital circuits.