Altitude control in Drone Programming - Mini Project: Build & Apply

Altitude control

📖 Scenario: You are programming a drone to maintain a safe flying altitude. The drone reads altitude data from its sensors and adjusts its height to stay within a safe range.

🎯 Goal: Build a simple altitude control program that reads altitude data, sets a safe altitude range, checks if the drone is too low or too high, and prints the appropriate action.

📋 What You'll Learn

Create a variable to store the current altitude reading.

Create variables for minimum and maximum safe altitude.

Write logic to check if the altitude is below minimum, above maximum, or safe.

Print the action the drone should take based on altitude.

💡 Why This Matters

🌍 Real World

Drones must keep a safe altitude to avoid obstacles and follow regulations. This program helps drones decide when to go up, down, or stay steady.

💼 Career

Understanding sensor data and control logic is key for drone programming and robotics jobs.

1

Set the current altitude

Create a variable called current_altitude and set it to 120 to represent the drone's current altitude in meters.

Drone Programming

# Create a variable called current_altitude and set it to 120
# Your code here

Hint

Use the equals sign = to assign the value 120 to the variable current_altitude.

2

Set safe altitude range

Create two variables called min_altitude and max_altitude. Set min_altitude to 100 and max_altitude to 150 to define the safe flying range in meters.

Drone Programming

current_altitude = 120
# Create min_altitude = 100 and max_altitude = 150
# Your code here

Hint

Assign 100 to min_altitude and 150 to max_altitude using =.

3

Check altitude and decide action

Write an if-elif-else statement to check the current_altitude. If it is less than min_altitude, set a variable action to "Ascend". If it is greater than max_altitude, set action to "Descend". Otherwise, set action to "Hold".

Drone Programming

current_altitude = 120
min_altitude = 100
max_altitude = 150
# Write if-elif-else to set action based on current_altitude
# Your code here

Hint

Use if, elif, and else to compare current_altitude with min_altitude and max_altitude.

4

Print the drone action

Write a print statement to display the text "Drone action:" followed by the value of the action variable.

Drone Programming

current_altitude = 120
min_altitude = 100
max_altitude = 150

if current_altitude  max_altitude:
    action = "Descend"
else:
    action = "Hold"

# Print the drone action
# Your code here

Hint

Use print("Drone action:", action) to show the result.

Practice

1. What is the main purpose of altitude control in drone programming?

easy

A. To keep or change the drone's height safely

B. To control the drone's speed horizontally

C. To manage the drone's battery life

D. To adjust the drone's camera angle

Solution

1. Step 1: Understand altitude control function

   Altitude control is about managing the drone's height above ground.

2. Step 2: Compare options to this function

   Only To keep or change the drone's height safely talks about height control, others focus on speed, battery, or camera.

3. Final Answer:

   To keep or change the drone's height safely -> Option A

4. Quick Check:

   Altitude control = height management [OK]

Hint: Altitude control means managing drone height safely [OK]

Common Mistakes:

• Confusing altitude with speed control
• Thinking altitude control manages battery
• Mixing altitude control with camera settings

2. Which of the following is the correct syntax to set a target altitude of 100 meters in a drone program?

easy

A. altitude = 100m

B. setAltitude(100)

C. targetAltitude = '100'

D. set_altitude = 100

Solution

1. Step 1: Identify correct function call syntax

   Function calls use parentheses with numeric values, like setAltitude(100).

2. Step 2: Check other options for syntax errors

   altitude = 100m uses invalid unit '100m' without quotes or function; C uses string instead of number; D assigns value but not a function call.

3. Final Answer:

   setAltitude(100) -> Option B

4. Quick Check:

   Function call with number = setAltitude(100) [OK]

Hint: Function calls use parentheses with numbers, not strings or units [OK]

Common Mistakes:

• Using units like '100m' directly in code
• Assigning string instead of number for altitude
• Confusing assignment with function call

3. What will be the output of this code snippet controlling drone altitude?

current_altitude = 50
set_target = 100
if current_altitude < set_target:
    print('Ascending')
else:
    print('Holding position')

medium

A. Holding position

B. Descending

C. Ascending

D. Error

Solution

1. Step 1: Compare current altitude and target

   current_altitude is 50, set_target is 100, so 50 < 100 is True.

2. Step 2: Determine which print runs

   Since condition is True, it prints 'Ascending'.

3. Final Answer:

   Ascending -> Option C

4. Quick Check:

   50 < 100 means Ascending [OK]

Hint: If current altitude less than target, drone ascends [OK]

Common Mistakes:

• Confusing less than with greater than
• Expecting 'Holding position' when ascending
• Thinking code has syntax error

4. Identify the error in this altitude control code snippet:

def adjust_altitude(current, target):
    if current > target
        return 'Descending'
    else:
        return 'Ascending'

medium

A. Indentation error in else block

B. Wrong comparison operator

C. Function missing return statement

D. Missing colon after if condition

Solution

1. Step 1: Check syntax of if statement

   The if line lacks a colon at the end, which is required in Python.

2. Step 2: Verify other parts

   Comparison operator and return statements are correct; indentation is consistent.

3. Final Answer:

   Missing colon after if condition -> Option D

4. Quick Check:

   Python if needs colon ':' [OK]

Hint: Python if statements always end with a colon ':' [OK]

Common Mistakes:

• Forgetting colon after if condition
• Assuming wrong operator causes error
• Misreading indentation as error

5. You want the drone to hover steadily at 120 meters. Which code snippet correctly adjusts motor power based on current altitude to maintain this target?

def control_altitude(current):
    target = 120
    if current < target:
        power = 70
    elif current > target:
        power = 30
    else:
        power = 50
    return power

print(control_altitude(120))

hard

A. 50

B. 70

C. 30

D. 120

Solution

1. Step 1: Understand the target and current altitude

   Target is 120 meters; current altitude passed is 120.

2. Step 2: Follow the if-elif-else logic

   Since current equals target, the else block runs, setting power to 50.

3. Final Answer:

   50 -> Option A

4. Quick Check:

   Hover power at target altitude = 50 [OK]

Hint: At target altitude, motor power is set to hover value [OK]

Common Mistakes:

• Choosing power for ascending or descending instead of hover
• Confusing comparison operators
• Returning altitude instead of power