In this video you will learn why we use pull up and pull down resistor with input and how to use pull up and pull down resistor to eliminate or reduce noisy signal. keep in mind this scheme use to eliminate distortion on input pins of arduino. Often it is useful to steer an input pin to a known state if no input is present. This can be done by adding a pullup resistor (to +5V), or a pull-down resistor (resistor to ground) on the input. A 10K resistor is a good value for a pull up or pull down resistor.
Pull-Up scheme: With a pull-up resistor and with the button unpressed you make a logic state ON and with the button pressed you make a logic OFF. Pull-Down scheme: With a pull - down resistor and a pressed button you make an ON logic state and OFF logic state when its unpressed.
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