Camera gimbal control in Drone Programming - Mini Project: Build & Apply

Camera gimbal control

📖 Scenario: You are programming a drone's camera gimbal to keep the camera steady and pointed correctly during flight. The gimbal can tilt up and down and pan left and right. You want to control the gimbal angles based on input commands.

🎯 Goal: Build a simple program that stores initial gimbal angles, sets limits for movement, updates the angles based on commands, and prints the final gimbal position.

📋 What You'll Learn

Create a dictionary to store the gimbal angles for tilt and pan.

Create variables to store the minimum and maximum allowed angles for tilt and pan.

Write code to update the gimbal angles based on input commands, ensuring the angles stay within limits.

Print the final gimbal angles after applying the commands.

💡 Why This Matters

🌍 Real World

Camera gimbals on drones keep the camera steady and pointed correctly even when the drone moves. Programming the gimbal angles helps capture smooth videos and photos.

💼 Career

Drone operators and developers use gimbal control programming to improve aerial photography and videography quality.

1

Set initial gimbal angles

Create a dictionary called gimbal_angles with two keys: 'tilt' set to 0 and 'pan' set to 0.

Drone Programming

# Create the gimbal_angles dictionary with tilt and pan set to 0
# Your code here

Hint

Use curly braces to create a dictionary with keys 'tilt' and 'pan'. Set both values to 0.

2

Set gimbal angle limits

Create four variables: min_tilt set to -90, max_tilt set to 30, min_pan set to -180, and max_pan set to 180.

Drone Programming

gimbal_angles = {'tilt': 0, 'pan': 0}
# Create min_tilt, max_tilt, min_pan, max_pan variables with given values
# Your code here

Hint

Assign the exact numbers to the variables as given.

3

Update gimbal angles with limits

Given a list commands = [('tilt', 20), ('pan', -200), ('tilt', -100)], write a for loop using variables axis and angle_change to update gimbal_angles[axis] by adding angle_change. After each update, ensure gimbal_angles['tilt'] stays between min_tilt and max_tilt, and gimbal_angles['pan'] stays between min_pan and max_pan.

Drone Programming

gimbal_angles = {'tilt': 0, 'pan': 0}
min_tilt = -90
max_tilt = 30
min_pan = -180
max_pan = 180
commands = [('tilt', 20), ('pan', -200), ('tilt', -100)]
# Write a for loop to update gimbal_angles with limits
# Your code here

Hint

Use a for loop to go through each command. Add the angle change to the correct axis. Then check if the new angle is outside the limits and fix it.

4

Print final gimbal angles

Write a print statement to display the gimbal_angles dictionary.

Drone Programming

gimbal_angles = {'tilt': 0, 'pan': 0}
min_tilt = -90
max_tilt = 30
min_pan = -180
max_pan = 180
commands = [('tilt', 20), ('pan', -200), ('tilt', -100)]
for axis, angle_change in commands:
    gimbal_angles[axis] += angle_change
    if axis == 'tilt':
        if gimbal_angles['tilt']  max_tilt:
            gimbal_angles['tilt'] = max_tilt
    elif axis == 'pan':
        if gimbal_angles['pan']  max_pan:
            gimbal_angles['pan'] = max_pan
# Print the gimbal_angles dictionary
# Your code here

Hint

Use print(gimbal_angles) to show the final angles.

Practice

1. What does the pitch control in a drone's camera gimbal?

easy

A. Moves the camera up and down

B. Rotates the camera left and right

C. Tilts the camera diagonally

D. Zooms the camera in and out

Solution

1. Step 1: Understand gimbal axes

   The gimbal controls three main movements: pitch, yaw, and roll.

2. Step 2: Identify pitch movement

   Pitch moves the camera up and down, changing its vertical angle.

3. Final Answer:

   Moves the camera up and down -> Option A

4. Quick Check:

   Pitch = up/down movement [OK]

Hint: Pitch always means up/down tilt [OK]

Common Mistakes:

• Confusing pitch with yaw
• Thinking pitch controls zoom
• Mixing pitch with roll

2. Which of the following is the correct syntax to set the yaw angle to 45 degrees in a drone gimbal control API?

easy

A. gimbal.setYaw(45)

B. gimbal.yaw = 45

C. gimbal.set_yaw(45)

D. gimbal.yaw(45)

Solution

1. Step 1: Identify common method naming

   In many drone APIs, methods use snake_case like set_yaw() to set angles.

2. Step 2: Check syntax correctness

   gimbal.set_yaw(45) uses gimbal.set_yaw(45), which is a valid method call with correct syntax.

3. Final Answer:

   gimbal.set_yaw(45) -> Option C

4. Quick Check:

   Method calls use parentheses and snake_case [OK]

Hint: Look for method call with parentheses and snake_case [OK]

Common Mistakes:

• Using dot assignment instead of method call
• Missing parentheses
• Using camelCase instead of snake_case

3. What will be the output of this code snippet controlling the gimbal pitch?

gimbal.set_pitch(10)
gimbal.set_pitch(gimbal.get_pitch() + 15)
print(gimbal.get_pitch())

medium

A. 10

B. 25

C. Error

D. 15

Solution

1. Step 1: Analyze first pitch set

   The first line sets pitch to 10 degrees.

2. Step 2: Analyze second pitch set

   The second line adds 15 to current pitch (10 + 15 = 25) and sets it.

3. Step 3: Print current pitch

   Printing pitch outputs 25.

4. Final Answer:

   25 -> Option B

5. Quick Check:

   10 + 15 = 25 [OK]

Hint: Add increments to current pitch before printing [OK]

Common Mistakes:

• Ignoring addition in second set
• Assuming print shows first set value
• Syntax errors in method calls

4. Identify the error in this code snippet for resetting the gimbal:

def reset_gimbal():
    gimbal.set_pitch = 0
    gimbal.set_yaw = 0
    gimbal.set_roll = 0
reset_gimbal()

medium

A. Using assignment instead of method calls

B. Missing parentheses in function call

C. Incorrect function definition syntax

D. No error, code is correct

Solution

1. Step 1: Check how gimbal angles are set

   Angles should be set by calling methods like gimbal.set_pitch(0), not by assignment.

2. Step 2: Identify incorrect assignments

   The code uses gimbal.set_pitch = 0, which overwrites the method with an integer, causing errors.

3. Final Answer:

   Using assignment instead of method calls -> Option A

4. Quick Check:

   Methods need parentheses, not assignment [OK]

Hint: Use parentheses to call methods, not '=' assignment [OK]

Common Mistakes:

• Assigning values to methods
• Forgetting parentheses
• Assuming functions are variables

5. You want to smoothly move the camera gimbal from pitch 0 to 30 degrees in 3 steps. Which code correctly implements this using a loop?

hard

A. for angle in range(0, 30):
gimbal.set_pitch(angle * 10)

B. for angle in [10, 20, 30]:
gimbal.set_pitch(angle)

C. for angle in range(0, 30, 10):
gimbal.set_pitch(angle)

D. for angle in range(0, 31, 10):
gimbal.set_pitch(angle)

Solution

1. Step 1: Understand the target angles

   The pitch should move through 0, 10, 20, and 30 degrees in steps.

2. Step 2: Check each option's range

   for angle in range(0, 31, 10): gimbal.set_pitch(angle) produces angles 0, 10, 20, 30, which smoothly moves from 0 to 30 in 4 steps.

3. Step 3: Verify other options

   for angle in [10, 20, 30]: gimbal.set_pitch(angle) -> misses starting at 0. for angle in range(0, 30, 10): gimbal.set_pitch(angle) -> stops at 20, missing 30. for angle in range(0, 30): gimbal.set_pitch(angle * 10) -> incorrect values (0 to 290).

4. Final Answer:

   for angle in range(0, 31, 10): gimbal.set_pitch(angle) -> Option D

5. Quick Check:

   Range includes 0 to 30 in steps of 10 [OK]

Hint: Use range with correct start, stop, and step for smooth movement [OK]

Common Mistakes:

• Off-by-one in range end
• Wrong step size in range
• Incorrect multiplication inside loop