I am using an Arduino Pro Mini to detect a PWM signal from a radio control receiver. The input pin on the Arduino is supposed to be limited to 20mA current with a max current of 40mA. I plan on using a 220 ohm resistor in the circuit. Do I need a .1uF cap to ground (and what kind of cap)? Adding a cap seems like it will smooth the signal and make it more of a constant voltage signal. The following is part of my circuit so far. TIA
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