Virtual Labs

Tools

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Aim

Theory

Pretest

Procedure

Simulation

Posttest

References

Feedback

Interfacing of Analog Sensors

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Beginner

Intermediate

Advanced

What is the main reason for connecting the LM35 sensor's Vout pin to Arduino's A0 pin?

a: Because A0 is the only analog pin available Explanation

Explanation

b: Because the LM35 provides an analog signal, and A0 is an analog input pin Explanation

Explanation

c: Because A0 is the fastest input pin Explanation

Explanation

d: Because A0 is for power supply Explanation

Explanation

What is the NPN transistor used for in your project's circuit?

a: To reduce the brightness of the LED Explanation

Explanation

b: To act as a switch between the Arduino and the LED Explanation

Explanation

c: To provide power to the relay coil Explanation

Explanation

d: To measure the temperature Explanation

Explanation

What happens if you don't use a 220Ω resistor with the LED?

a: The LED will be brighter and burn out quickly Explanation

Explanation

b: The LED will not light up at all. Explanation

Explanation

c: The LCD display will stop working. Explanation

Explanation

d: The Arduino board will be damaged Explanation

Explanation

When the digitalWrite(motorPin, HIGH) command is executed, which component ultimately powers the 12V DC motor?

a: The Arduino Uno. Explanation

Explanation

b: The LCD display. Explanation

Explanation

c: The 12V power supply. Explanation

Explanation

d: The LM35 sensor Explanation

Explanation

According to your code, what will the LCD display show if the temperature is 38°C?

a: Only the temperature and 'MOTOR & LED ON'. Explanation

Explanation

b: Only the temperature Explanation

Explanation

c: Nothing at all Explanation

Explanation

d: Only 'MOTOR & LED OFF' Explanation

Explanation

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