I'm trying to connect an 8052 (Micromint Domino) to the ignition on my motorcycle, allowing the 8052 to serve as data logger. Being very new to the hardware design side of things, I can's seem to find a simple debounce circuit that can be connected to the 12 volts of the ignition system and to the interrupt line of the 8052. To serve as a diagnostic tool, I'd like an LED in the circuit (gotta have blinking lights).
Can anybody help with a circuit design.