Pre-flight checklist automation in Drone Programming - Mini Project: Build & Apply

Pre-flight checklist automation

📖 Scenario: You are preparing a drone for flight. To ensure safety, you need to check several important systems before takeoff. Automating this checklist helps avoid mistakes and saves time.

🎯 Goal: Build a simple program that stores the drone's system checks, sets a threshold for passing, filters which checks passed, and then displays the final list of passed checks.

📋 What You'll Learn

Create a dictionary called system_checks with exact keys and values for system names and their status scores

Create a variable called pass_threshold with the exact value 75

Use a dictionary comprehension called passed_checks to include only systems with scores greater than or equal to pass_threshold

Print the passed_checks dictionary exactly as shown

💡 Why This Matters

🌍 Real World

Automating pre-flight checks helps drone operators quickly verify that all important systems are ready, improving safety and efficiency.

💼 Career

Knowledge of filtering data and using dictionary comprehensions is useful for software developers working on automation, robotics, or embedded systems.

1

Create the system checks dictionary

Create a dictionary called system_checks with these exact entries: 'Battery': 80, 'Motors': 90, 'Sensors': 70, 'GPS': 85, 'Camera': 60

Drone Programming

# Create the system_checks dictionary with exact entries
# Your code here

Hint

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

2

Set the pass threshold

Create a variable called pass_threshold and set it to the integer 75

Drone Programming

system_checks = {'Battery': 80, 'Motors': 90, 'Sensors': 70, 'GPS': 85, 'Camera': 60}
# Set pass_threshold to 75
# Your code here

Hint

Just assign the number 75 to the variable pass_threshold.

3

Filter passed system checks

Use a dictionary comprehension called passed_checks to include only the systems from system_checks where the score is greater than or equal to pass_threshold

Drone Programming

system_checks = {'Battery': 80, 'Motors': 90, 'Sensors': 70, 'GPS': 85, 'Camera': 60}
pass_threshold = 75
# Create passed_checks dictionary comprehension
# Your code here

Hint

Use {system: score for system, score in system_checks.items() if score >= pass_threshold} to filter.

4

Display the passed checks

Print the passed_checks dictionary exactly as it is

Drone Programming

system_checks = {'Battery': 80, 'Motors': 90, 'Sensors': 70, 'GPS': 85, 'Camera': 60}
pass_threshold = 75
passed_checks = {system: score for system, score in system_checks.items() if score >= pass_threshold}
# Print passed_checks
# Your code here

Hint

Use print(passed_checks) to show the filtered dictionary.

Practice

1. What is the main purpose of automating a pre-flight checklist in drone programming?

easy

A. To improve safety and save time before flying

B. To make the drone fly faster

C. To change the drone's color automatically

D. To increase the drone's battery capacity

Solution

1. Step 1: Understand the goal of pre-flight checks

   Pre-flight checks ensure the drone is safe and ready to fly.

2. Step 2: Identify automation benefits

   Automating these checks saves time and reduces human error.

3. Final Answer:

   To improve safety and save time before flying -> Option A

4. Quick Check:

   Automation = Safety + Time saving [OK]

Hint: Think about safety and efficiency before flight [OK]

Common Mistakes:

• Confusing automation with drone speed
• Assuming automation changes hardware features
• Ignoring safety as the main goal

2. Which of the following is the correct way to define a class in drone programming for a pre-flight checklist?

easy

A. PreFlightCheck = {}

B. def PreFlightCheck(): pass

C. class PreFlightCheck: pass

D. function PreFlightCheck() {}

Solution

1. Step 1: Identify class syntax in drone programming (Python style)

   Classes are defined with the keyword 'class' followed by the name and colon.

2. Step 2: Check options for correct class definition

   class PreFlightCheck: pass uses 'class PreFlightCheck: pass' which is valid syntax.

3. Final Answer:

   class PreFlightCheck: pass -> Option C

4. Quick Check:

   Class keyword + name + colon = correct class [OK]

Hint: Classes start with 'class' keyword and colon [OK]

Common Mistakes:

• Using 'def' instead of 'class' for class definition
• Using curly braces instead of colon
• Assigning class to a dictionary

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

class CheckList:
    def __init__(self):
        self.steps = {'battery': True, 'motors': True, 'gps': False}
    def all_passed(self):
        return all(self.steps.values())

check = CheckList()
print(check.all_passed())

medium

A. False

B. None

C. True

D. Error

Solution

1. Step 1: Analyze the steps dictionary values

   The steps are {'battery': True, 'motors': True, 'gps': False} so values are [True, True, False].

2. Step 2: Evaluate all() function on values

   all() returns True only if all values are True; here one is False, so result is False.

3. Final Answer:

   False -> Option A

4. Quick Check:

   all([True, True, False]) = False [OK]

Hint: all() returns False if any value is False [OK]

Common Mistakes:

• Assuming all() returns True if some values are True
• Confusing dictionary keys with values
• Expecting print to show dictionary instead of boolean

4. Identify the error in this pre-flight checklist code:

class PreFlight:
    def __init__(self):
        self.steps = {'battery': True, 'motors': True}
    def check_all(self):
        for step in self.steps:
            if self.steps[step] = False:
                return False
        return True

pf = PreFlight()
print(pf.check_all())

medium

A. Indentation error in for loop

B. Missing return statement in check_all method

C. Incorrect dictionary initialization syntax

D. Syntax error: '=' used instead of '==' in if condition

Solution

1. Step 1: Check the if condition syntax

   The line 'if self.steps[step] = False:' uses '=' which is assignment, not comparison.

2. Step 2: Correct syntax for comparison

   It should be '==' to compare values, so 'if self.steps[step] == False:' is correct.

3. Final Answer:

   Syntax error: '=' used instead of '==' in if condition -> Option D

4. Quick Check:

   Use '==' for comparison, '=' causes syntax error [OK]

Hint: Use '==' for comparison, not '=' [OK]

Common Mistakes:

• Using '=' instead of '==' in conditions
• Forgetting to return a value
• Misindenting loops or blocks

5. You want to extend the pre-flight checklist to automatically add a new step only if the drone has a camera. Which code snippet correctly adds this conditional step inside the class?

hard

A. self.steps['camera'] = self.has_camera

B. if self.has_camera == True:
self.steps['camera'] = True

C. self.steps['camera'] = True if self.has_camera else None

D. self.steps.append('camera') if self.has_camera else None

Solution

1. Step 1: Understand conditional addition of step

   We add 'camera' step only if self.has_camera is True.

2. Step 2: Check syntax for condition and dictionary update

   if self.has_camera == True: self.steps['camera'] = True uses 'if self.has_camera == True:' and sets self.steps['camera'] = True, which is clear and correct.

3. Final Answer:

   if self.has_camera == True: self.steps['camera'] = True -> Option B

4. Quick Check:

   Use if condition and dict assignment for conditional step [OK]

Hint: Use if condition with dict assignment for conditional steps [OK]

Common Mistakes:

• Using append on dictionary instead of assignment
• Assigning without condition
• Using wrong syntax for condition