Stepper motor with driver module in Arduino - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to define the step pin for the stepper motor driver.

Arduino

const int stepPin = [1];

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

A12

B3

C9

D5

Attempts:

3 left

💡 Hint

Common Mistakes

Using a pin number not connected to the step input of the driver.

The step pin is connected to digital pin 9 on the Arduino.

2fill in blank

medium

Complete the code to set the direction pin as an output in the setup function.

Arduino

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

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

AstepPin

BledPin

CenablePin

DdirPin

Attempts:

3 left

💡 Hint

Common Mistakes

Setting the wrong pin as output or forgetting to set the pin mode.

The direction pin controls the rotation direction and must be set as output.

3fill in blank

hard

Fix the error in the loop to make the motor step correctly.

Arduino

digitalWrite(stepPin, HIGH);
delay([1]);
digitalWrite(stepPin, LOW);
delay(1);

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

A10

B1000

C0

D-10

Attempts:

3 left

💡 Hint

Common Mistakes

Using zero or negative delay causing no movement or errors.

A delay of 10 milliseconds between steps allows the motor to move smoothly.

4fill in blank

hard

Fill both blanks to complete the code that sets the motor direction and steps it.

Arduino

digitalWrite([1], HIGH);
digitalWrite([2], HIGH);
delay(10);

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

AdirPin

BstepPin

CenablePin

DledPin

Attempts:

3 left

💡 Hint

Common Mistakes

Confusing stepPin and dirPin or using unrelated pins.

Set the direction pin HIGH to choose direction, then pulse the step pin HIGH to move one step.

5fill in blank

hard

Fill all three blanks to create an array holding the pin numbers for stepPin, dirPin, and enablePin.

Arduino

const int pins[] = { [1], [2], [3] };

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

AstepPin

BdirPin

CenablePin

DledPin

Attempts:

3 left

💡 Hint

Common Mistakes

Including unrelated pins like ledPin or missing one of the motor control pins.

The array holds the pin numbers for step, direction, and enable pins used by the driver.

Practice

1. What is the main role of a driver module when controlling a stepper motor with Arduino?

easy

A. To store the motor's position data

B. To increase the speed of the Arduino board

C. To safely provide the correct power and signals to the motor

D. To convert analog signals to digital

Solution

1. Step 1: Understand the function of a driver module

   The driver module acts as a bridge between Arduino and the stepper motor, providing the right voltage and current safely.

2. Step 2: Identify the correct role

   It controls power and signals to the motor, preventing damage and ensuring proper movement.

3. Final Answer:

   To safely provide the correct power and signals to the motor -> Option C

4. Quick Check:

   Driver module = safe power and signals [OK]

Hint: Driver modules protect motor and Arduino by controlling power [OK]

Common Mistakes:

• Thinking driver speeds up Arduino
• Believing driver stores position data
• Confusing driver with signal converter

2. Which Arduino code snippet correctly sets the direction pin to HIGH for a stepper motor driver?

easy

A. digitalWrite(directionPin, low);

B. digitalWrite(directionPin, "HIGH");

C. digitalWrite(directionPin, 0);

D. digitalWrite(directionPin, HIGH);

Solution

1. Step 1: Check correct syntax for digitalWrite

   The function digitalWrite(pin, value) expects the value to be HIGH or LOW without quotes and case-sensitive.

2. Step 2: Identify correct usage

   digitalWrite(directionPin, HIGH); uses digitalWrite(directionPin, HIGH); which is correct syntax and case.

3. Final Answer:

   digitalWrite(directionPin, HIGH); -> Option D

4. Quick Check:

   digitalWrite with HIGH (uppercase, no quotes) [OK]

Hint: Use uppercase HIGH/LOW without quotes in digitalWrite [OK]

Common Mistakes:

• Using lowercase 'low' instead of 'LOW'
• Passing numbers instead of HIGH/LOW constants
• Using quotes around HIGH or LOW

3. What will be the output behavior of this Arduino code controlling a stepper motor driver?

const int stepPin = 3;
const int dirPin = 4;

void setup() {
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  digitalWrite(dirPin, HIGH);
}

void loop() {
  digitalWrite(stepPin, HIGH);
  delay(2);
  digitalWrite(stepPin, LOW);
  delay(2);
}

medium

A. The code will cause a compile error

B. The motor will rotate continuously in one direction at a slow speed

C. The motor will not move because direction is not set

D. The motor will rotate once and stop

Solution

1. Step 1: Analyze pin setup and direction

   Direction pin is set to HIGH once in setup, so motor direction is fixed.

2. Step 2: Analyze loop step pulses

   Loop sends pulses to stepPin with 2ms HIGH and 2ms LOW delays, causing continuous stepping.

3. Final Answer:

   The motor will rotate continuously in one direction at a slow speed -> Option B

4. Quick Check:

   Continuous pulses + fixed direction = continuous rotation [OK]

Hint: Continuous step pulses with fixed direction cause continuous rotation [OK]

Common Mistakes:

• Thinking motor moves once then stops
• Assuming direction not set means no movement
• Expecting compile errors from correct code

4. Identify the error in this Arduino code snippet for controlling a stepper motor driver:

int stepPin = 5;
int dirPin = 6;

void setup() {
  pinMode(stepPin, OUTPUT);
  pinMode(dirPin, OUTPUT);
  digitalWrite(dirPin, HIGH);
}

void loop() {
  digitalWrite(stepPin, HIGH);
  delay(1);
  digitalWrite(stepPin, HIGH);
  delay(1);
}

medium

A. The stepPin is never set to LOW, so no step pulse is generated

B. The direction pin is not set as input

C. The delay time is too short to move the motor

D. The pinMode calls are missing

Solution

1. Step 1: Check step pulse signal

   Step pulses require a HIGH then LOW transition to trigger a step.

2. Step 2: Identify missing LOW signal

   Code sets stepPin HIGH twice without setting it LOW in between, so no pulse occurs.

3. Final Answer:

   The stepPin is never set to LOW, so no step pulse is generated -> Option A

4. Quick Check:

   Step pulse = HIGH then LOW [OK]

Hint: Step pulse needs HIGH then LOW transition [OK]

Common Mistakes:

• Forgetting to set stepPin LOW after HIGH
• Confusing direction pin mode
• Assuming short delay fixes pulse issue

5. You want to rotate a stepper motor exactly 200 steps clockwise, then 200 steps counterclockwise using a driver module. Which Arduino code snippet correctly achieves this?

hard

A. for(int i=0; i<200; i++) { digitalWrite(dirPin, HIGH); digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); } for(int i=0; i<200; i++) { digitalWrite(dirPin, LOW); digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); }

B. digitalWrite(dirPin, HIGH); for(int i=0; i<=200; i++) { digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); } digitalWrite(dirPin, LOW); for(int i=0; i<=200; i++) { digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); }

C. for(int i=0; i<200; i++) { digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); } digitalWrite(dirPin, HIGH); for(int i=0; i<200; i++) { digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); }

D. digitalWrite(dirPin, HIGH); digitalWrite(stepPin, HIGH); delay(200); digitalWrite(stepPin, LOW); delay(200); digitalWrite(dirPin, LOW); digitalWrite(stepPin, HIGH); delay(200); digitalWrite(stepPin, LOW); delay(200);

Solution

1. Step 1: Set direction before stepping

   Each loop sets direction pin before sending step pulses to control rotation direction.

2. Step 2: Send exact number of step pulses

   Each for loop sends 200 pulses with HIGH then LOW signals and delays for timing.

3. Step 3: Verify code correctness

   for(int i=0; i<200; i++) { digitalWrite(dirPin, HIGH); digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); } for(int i=0; i<200; i++) { digitalWrite(dirPin, LOW); digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); } correctly sets direction inside each loop and sends 200 pulses per direction.

4. Final Answer:

   for(int i=0; i<200; i++) { digitalWrite(dirPin, HIGH); digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); } for(int i=0; i<200; i++) { digitalWrite(dirPin, LOW); digitalWrite(stepPin, HIGH); delay(1); digitalWrite(stepPin, LOW); delay(1); } -> Option A

5. Quick Check:

   Set direction before stepping, send 200 pulses each way [OK]

Hint: Set direction before loop, pulse stepPin HIGH then LOW 200 times [OK]

Common Mistakes:

• Setting direction inside step pulse loop incorrectly
• Using delay as step count instead of pulse count
• Not toggling stepPin LOW after HIGH