DC motor with transistor driver in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the motor pin as an output.

Arduino

const int motorPin = 9;

void setup() {
  pinMode([1], OUTPUT);
}

void loop() {
  // Motor control code here
}

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AINPUT

BmotorPin

C9

DpinMode

Attempts:

3 left

💡 Hint

Common Mistakes

Using the number 9 directly instead of the variable name.

Using INPUT instead of OUTPUT.

You need to tell the Arduino that motorPin is an output pin using pinMode().

2fill in blank

medium

Complete the code to turn the motor ON by setting the pin HIGH.

Arduino

const int motorPin = 9;

void setup() {
  pinMode(motorPin, OUTPUT);
}

void loop() {
  digitalWrite(motorPin, [1]);
  delay(1000);
  digitalWrite(motorPin, LOW);
  delay(1000);
}

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AHIGH

BLOW

COUTPUT

DINPUT

Attempts:

3 left

💡 Hint

Common Mistakes

Using LOW instead of HIGH to turn the motor ON.

Confusing pinMode values with digitalWrite values.

To turn the motor ON, set the pin to HIGH using digitalWrite().

3fill in blank

hard

Fix the error in the code to correctly control the motor speed using PWM.

Arduino

const int motorPin = 9;

void setup() {
  pinMode(motorPin, OUTPUT);
}

void loop() {
  analogWrite(motorPin, [1]);
  delay(1000);
}

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AOUTPUT

BHIGH

C255

DdigitalWrite

Attempts:

3 left

💡 Hint

Common Mistakes

Using HIGH instead of a numeric PWM value.

Using digitalWrite instead of analogWrite.

Use analogWrite() with a value between 0 and 255 to control motor speed. 255 means full speed.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps motor speeds to their PWM values if speed is greater than 100.

Arduino

int speeds[] = {50, 120, 200};

void setup() {
  // This is a conceptual example, Arduino C++ does not support dictionary comprehensions
  // Imagine a map: {speed: [1] for speed in speeds if speed [2] 100}
}

void loop() {}

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Aspeed * 2

B<

C>

Dspeed + 10

Attempts:

3 left

💡 Hint

Common Mistakes

Using '<' instead of '>' in the condition.

Using incorrect expressions for the value.

The comprehension maps each speed to speed * 2 only if the speed is greater than 100.

5fill in blank

hard

Fill all three blanks to create a function that sets motor speed only if the speed is within 0 to 255.

Arduino

const int motorPin = 9;

void setup() {
  pinMode(motorPin, OUTPUT);
}

void setMotorSpeed(int speed) {
  if (speed [1] 0 && speed [2] 255) {
    analogWrite(motorPin, [3]);
  }
}

void loop() {
  setMotorSpeed(200);
}

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A>=

B<=

Cspeed

DmotorPin

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong comparison operators.

Passing motorPin instead of speed to analogWrite.

The function checks if speed is between 0 and 255 inclusive, then writes the speed value to the motor pin.