I got somewhat short pulse 35ms, I written script in python using RPi.GPIO, using event and callback. Is it possible to detect so short pulses? On related question how close to 3V3 I need to get? I found
"A voltage near 3.3 V is interpreted as a logic one"
But nothing specific, I will be below 3V3 but how low can I get? 2V5 is enough? Have not run this cause still waiting on hardware that generates pulses, I just wonder if I need 555 to extend pulses. Raspberry 2 if that's important