Understanding HIGH and LOW Arduino Pin States :: Open Source Hardware Group Arduino Tutorials

The video tutorial explains the concepts of low and high digital pin states on an Arduino board. It covers how to determine these states using the Atmel 328 microcontroller's data sheet, focusing on voltage thresholds for low and high states. The tutorial also includes a practical demonstration using the Arduino IDE to read voltages from a potentiometer and apply them to a digital input pin, illustrating how to interpret the digital state based on voltage levels.

What is the primary function of a digital input pin on an Arduino?

• To store data permanently

• To control the speed of the Arduino

• To determine if the voltage is low or high

• To supply power to the Arduino

According to the Atmel 328 datasheet, what is the maximum voltage considered as low when VCC is 5 volts?

• 1.5 volts

• 0.5 volts

• 2.5 volts

• 3 volts

What is VCC in the context of Arduino?

• The frequency of the signal

• The resistance of the circuit

• The current flowing through the circuit

• The digital supply voltage

What is the minimum voltage required for a pin to read high when VCC is 5 volts?

• 2 volts

• 1.5 volts

• 4 volts

• 3 volts

What does the abstraction of digital states involve?

• Applying a protocol to determine low or high states

• Ignoring voltage levels

• Measuring current instead of voltage

• Using only analog signals

What is the indeterminate voltage range between low and high states?

• 0 to 1.5 volts

• 4.5 to 5 volts

• 1.5 to 3 volts

• 3 to 4.5 volts

Why is it important to ensure voltage is below 1.5 volts for low and above 3 volts for high?

• To reduce heat generation

• To increase the speed of the Arduino

• To avoid false positives in digital reads

• To save power

In the Arduino IDE demonstration, what does the digital read function return for a high voltage?

• 0

• 1

• 3

• 2

What is the purpose of using a potentiometer in the Arduino IDE demonstration?

• To change the frequency of the signal

• To store data

• To adjust the voltage applied to a pin

• To measure current

What does the serial monitor display in the Arduino IDE demonstration?

• The voltage and digital state of the pin

• The temperature of the Arduino

• The current flowing through the circuit

• The resistance of the potentiometer