Axes of rotation (roll, pitch, yaw) in Drone Programming - Mini Project: Build & Apply

Axes of rotation (roll, pitch, yaw)

📖 Scenario: You are programming a drone to understand its orientation in space. The drone can rotate around three main axes: roll, pitch, and yaw. Each axis changes the drone's direction in a different way, like how a plane tilts, nods, or turns.

🎯 Goal: Build a simple program that stores the drone's rotation angles for roll, pitch, and yaw, sets a threshold to detect if the drone is tilted too much, and then finds which axes exceed that threshold.

📋 What You'll Learn

Create a dictionary called rotation_angles with keys 'roll', 'pitch', and 'yaw' and their exact angle values.

Create a variable called tilt_threshold and set it to the exact value 15.

Use a for loop with variables axis and angle to iterate over rotation_angles.items() and create a list called exceeding_axes containing axes where the absolute angle is greater than tilt_threshold.

Print the list exceeding_axes.

💡 Why This Matters

🌍 Real World

Drones need to monitor their orientation to fly safely and avoid crashes. Understanding roll, pitch, and yaw helps control their movement.

💼 Career

Drone programmers and robotics engineers use these concepts to write software that keeps drones balanced and responsive.

1

DATA SETUP: Create the rotation angles dictionary

Create a dictionary called rotation_angles with these exact entries: 'roll': 10, 'pitch': 20, 'yaw': 5.

Drone Programming

# Create the rotation_angles dictionary with roll, pitch, and yaw angles
# Your code here

Hint

Use curly braces {} to create a dictionary with keys and values.

2

CONFIGURATION: Set the tilt threshold

Create a variable called tilt_threshold and set it to the integer value 15.

Drone Programming

rotation_angles = {'roll': 10, 'pitch': 20, 'yaw': 5}
# Create tilt_threshold variable and set it to 15
# Your code here

Hint

Just assign the number 15 to the variable tilt_threshold.

3

CORE LOGIC: Find axes exceeding the tilt threshold

Use a for loop with variables axis and angle to iterate over rotation_angles.items(). Create a list called exceeding_axes that contains axes where the absolute value of angle is greater than tilt_threshold.

Drone Programming

rotation_angles = {'roll': 10, 'pitch': 20, 'yaw': 5}
tilt_threshold = 15
exceeding_axes = []
# Use a for loop to check each axis angle and add axes exceeding tilt_threshold to exceeding_axes
# Your code here

Hint

Use abs(angle) to get the positive value of the angle.

4

OUTPUT: Display the axes exceeding the tilt threshold

Write a print statement to display the list exceeding_axes.

Drone Programming

rotation_angles = {'roll': 10, 'pitch': 20, 'yaw': 5}
tilt_threshold = 15
exceeding_axes = []
for axis, angle in rotation_angles.items():
    if abs(angle) > tilt_threshold:
        exceeding_axes.append(axis)
# Print the exceeding_axes list
# Your code here

Hint

Use print(exceeding_axes) to show the result.

Practice

1.

Which axis controls the drone's rotation that tilts it side to side?

easy

A. Pitch

B. Roll

C. Yaw

D. Throttle

Solution

1. Step 1: Understand the meaning of roll

   Roll is the rotation that tilts the drone left or right, like tipping side to side.

2. Step 2: Match roll to the axis

   Since roll controls side to side tilt, it matches the question.

3. Final Answer:

   Roll -> Option B

4. Quick Check:

   Side to side tilt = Roll [OK]

Hint: Roll = side tilt, Pitch = forward/back, Yaw = turn [OK]

Common Mistakes:

• Confusing pitch with roll
• Thinking yaw controls tilt
• Selecting throttle which controls speed

2.

Which of the following is the correct way to set the yaw angle to 45 degrees in a drone control program?

drone.set_yaw(____)

easy

A. "45"

B. set_yaw(45)

C. yaw = 45

D. 45

Solution

1. Step 1: Identify the correct argument type

   The method expects a number for the angle, so 45 without quotes is correct.

2. Step 2: Check the method call syntax

   drone.set_yaw(45) correctly calls the method with the number 45.

3. Final Answer:

   45 -> Option D

4. Quick Check:

   Number angle without quotes = 45 [OK]

Hint: Use numbers for angles, no quotes needed [OK]

Common Mistakes:

• Using quotes around numbers
• Assigning inside method call
• Calling method without object prefix

3.

What will be the output of this code snippet controlling drone rotation?

roll = 10
pitch = -5
yaw = 90
print(f"Roll: {roll}, Pitch: {pitch}, Yaw: {yaw}")

medium

A. Roll: 10, Pitch: -5, Yaw: 90

B. Roll: 10, Pitch: 5, Yaw: 90

C. Roll: 0, Pitch: -5, Yaw: 90

D. Error: yaw not defined

Solution

1. Step 1: Check variable assignments

   roll is 10, pitch is -5, yaw is 90 as assigned.

2. Step 2: Evaluate the print statement

   The f-string prints the values exactly as assigned.

3. Final Answer:

   Roll: 10, Pitch: -5, Yaw: 90 -> Option A

4. Quick Check:

   Print variables as assigned = Roll: 10, Pitch: -5, Yaw: 90 [OK]

Hint: Print variables exactly as assigned in f-string [OK]

Common Mistakes:

• Ignoring negative sign in pitch
• Assuming yaw is zero
• Mistyping variable names

4.

Find the error in this code that sets drone rotation angles:

drone.roll = 15
pitch = 20
drone.yaw = 45
print(f"Roll: {drone.roll}, Pitch: {pitch}, Yaw: {yaw}")

medium

A. roll should be assigned with drone.set_roll()

B. pitch should be drone.pitch

C. Variable yaw is not defined before print

D. print statement syntax is incorrect

Solution

1. Step 1: Check variable definitions

   roll and yaw are accessed as drone.roll and drone.yaw, pitch is a separate variable.

2. Step 2: Identify undefined variable in print

   yaw is used without drone prefix and not defined as variable, causing error.

3. Final Answer:

   Variable yaw is not defined before print -> Option C

4. Quick Check:

   Undefined variable in print = yaw [OK]

Hint: Check all variables used in print are defined [OK]

Common Mistakes:

• Assuming yaw variable exists without prefix
• Confusing pitch variable scope
• Thinking print syntax is wrong

5.

You want to program a drone to tilt forward by 30 degrees, roll right by 15 degrees, and turn left by 90 degrees. Which code snippet correctly sets these rotations?

Option A:
drone.set_pitch(30)
drone.set_roll(15)
drone.set_yaw(-90)

Option B:
drone.set_pitch(-30)
drone.set_roll(-15)
drone.set_yaw(90)

Option C:
drone.set_pitch(30)
drone.set_roll(-15)
drone.set_yaw(90)

Option D:
drone.set_pitch(-30)
drone.set_roll(15)
drone.set_yaw(-90)

hard

A. Pitch 30, Roll 15, Yaw -90

B. Pitch -30, Roll -15, Yaw 90

C. Pitch 30, Roll -15, Yaw 90

D. Pitch -30, Roll 15, Yaw -90

Solution

1. Step 1: Understand direction signs

   Forward tilt means positive pitch (30), roll right means positive roll (15), turn left means negative yaw (-90).

2. Step 2: Match signs to code options

   Pitch 30, Roll 15, Yaw -90 matches pitch=30, roll=15, yaw=-90 correctly.

3. Final Answer:

   Pitch 30, Roll 15, Yaw -90 -> Option A

4. Quick Check:

   Forward=+pitch, Right=+roll, Left=-yaw [OK]

Hint: Positive pitch forward, positive roll right, negative yaw left [OK]

Common Mistakes:

• Mixing positive/negative signs for directions
• Confusing roll and pitch directions
• Assuming yaw left is positive