The Complete Beginners Guide to Arduino - 2021 - Buttons and Pull Up/Down Resistors

The video tutorial explains common mistakes beginners make when wiring buttons to input pins without using pull-up or pull-down resistors. It highlights the importance of these resistors in preventing floating states and electrical noise, ensuring reliable high and low signals. The tutorial also covers the concept of circuit states, including high, low, and floating, and demonstrates how resistors help maintain stable readings. Additionally, it touches on the concept of button debounce and provides practical advice for setting up button circuits correctly.

What is a common mistake beginners make when connecting a button to an input pin?

• Using a resistor with too high resistance

• Not using a pull-up or pull-down resistor

• Using a capacitor instead of a resistor

• Connecting the button directly to ground

What are the three possible states of a pin in logic circuits?

• High, low, or floating

• High, low, or grounded

• On, off, or standby

• Positive, negative, or neutral

Why is it important to use a pull-down resistor in a button circuit?

• To increase the voltage

• To make the circuit more complex

• To ensure the pin reads a low signal when the button is not pressed

• To decrease the current

What happens when a button is pressed in a circuit with a pull-down resistor?

• The pin reads a high signal

• The resistor is bypassed

• The circuit becomes open

• The pin reads a low signal

How does electricity behave in a circuit with a pull-down resistor when the button is pressed?

• It takes the path of least resistance to the input pin

• It stops flowing

• It takes the path of least resistance to ground

• It flows equally through all paths

What change is made to use a pull-up resistor instead of a pull-down resistor?

• The switch and resistor positions are swapped

• The resistor value is increased

• The resistor is connected to a different pin

• The resistor is removed

What is the second common mistake beginners make when using buttons in circuits?

• Connecting the button to the wrong pin

• Not accounting for button debounce

• Not using a pull-up resistor

• Using too many resistors