I am trying to learn more about Arduino. I heard in almost all cases I should use a pull up or pull down resistor for serial communication. It helps with serial communication. Is this true?
By pull up resistor, I mean placing a resistor (typically 10 ohm) between the power and serial communication. By pull down resistor, I mean placing a resistor, typically 10 ohm, between ground the serial communication. When should I use pull up or pull down; when would this work? Is it typically 10 ohms based on the number of volts arduino can handle?