Motor speed control with PWM in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to set the motor speed using PWM on pin 9.

Arduino

int motorPin = 9;
void setup() {
  pinMode(motorPin, OUTPUT);
}
void loop() {
  analogWrite(motorPin, [1]);
  delay(1000);
}

Drag options to blanks, or click blank then click option'

ALOW

BHIGH

C9

D255

Attempts:

3 left

💡 Hint

Common Mistakes

Using HIGH or LOW instead of a PWM value.

Using the pin number instead of the speed value.

The analogWrite function sets the PWM duty cycle. 255 means full speed.

2fill in blank

medium

Complete the code to gradually increase motor speed from 0 to 255.

Arduino

int motorPin = 6;
void setup() {
  pinMode(motorPin, OUTPUT);
}
void loop() {
  for (int speed = 0; speed <= 255; speed++) {
    analogWrite(motorPin, [1]);
    delay(10);
  }
}

Drag options to blanks, or click blank then click option'

Aspeed

BmotorPin

C255

Ddelay

Attempts:

3 left

💡 Hint

Common Mistakes

Using the pin number instead of the speed variable.

Using a fixed value instead of the loop variable.

The variable speed changes from 0 to 255 to increase PWM duty cycle gradually.

3fill in blank

hard

Fix the error in the code to set motor speed using PWM on pin 3.

Arduino

int motorPin = 3;
void setup() {
  pinMode(motorPin, OUTPUT);
}
void loop() {
  analogWrite([1], 128);
  delay(500);
}

Drag options to blanks, or click blank then click option'

AmotorPin

B128

COUTPUT

D3

Attempts:

3 left

💡 Hint

Common Mistakes

Using the speed value instead of the pin number.

Using the pin number directly instead of the variable.

The first argument of analogWrite must be the pin number variable motorPin.

4fill in blank

hard

Fill both blanks to create a dictionary that maps motor pins to their PWM speeds if speed is above 100.

Arduino

int motorPins[] = {5, 6, 9};
int speeds[] = {90, 150, 200};
void setup() {
  for (int i = 0; i < 3; i++) {
    pinMode(motorPins[i], OUTPUT);
    if (speeds[i] [1] 100) {
      analogWrite(motorPins[i], [2]);
    }
  }
}
void loop() {}

Drag options to blanks, or click blank then click option'

A>

BmotorPins[i]

Cspeeds[i]

D<

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong comparison operator.

Using the pin number instead of the speed value for PWM.

The condition checks if speed is greater than 100, then writes PWM speed from speeds[i] to the motor pin.

5fill in blank

hard

Fill all three blanks to read an analog sensor, map its value to PWM range, and set motor speed.

Arduino

int sensorPin = A0;
int motorPin = 10;
void setup() {
  pinMode(motorPin, OUTPUT);
}
void loop() {
  int sensorValue = analogRead([1]);
  int motorSpeed = map(sensorValue, 0, 1023, [2], [3]);
  analogWrite(motorPin, motorSpeed);
  delay(100);
}

Drag options to blanks, or click blank then click option'

AsensorPin

B0

C255

DmotorPin

Attempts:

3 left

💡 Hint

Common Mistakes

Using the motor pin instead of sensor pin for reading.

Mapping to wrong PWM range.

The sensor is read from sensorPin. The value is mapped from 0-1023 to 0-255 for PWM.