Formation flying basics in Drone Programming - Mini Project: Build & Apply

Formation flying basics

📖 Scenario: You are programming a group of drones to fly together in a simple formation. Each drone has a unique ID and a starting position represented by coordinates (x, y).To keep the formation tight, you want to calculate the relative positions of each drone compared to the leader drone.

🎯 Goal: Build a program that stores the drones' starting positions, sets the leader drone, calculates the relative positions of all drones to the leader, and then prints these relative positions.

📋 What You'll Learn

Create a dictionary with drone IDs as keys and their (x, y) positions as values

Create a variable to store the leader drone's ID

Calculate the relative positions of each drone compared to the leader drone using a dictionary comprehension

Print the dictionary of relative positions

💡 Why This Matters

🌍 Real World

Drone teams often fly in formations for tasks like filming, surveying, or search and rescue. Calculating relative positions helps keep them coordinated.

💼 Career

Understanding how to manage multiple drones and their positions is important for drone operators, robotics programmers, and engineers working on autonomous systems.

1

Create the drones' starting positions

Create a dictionary called drones with these exact entries: 'drone1': (10, 20), 'drone2': (15, 25), 'drone3': (12, 22), 'drone4': (18, 30)

Drone Programming

# Create the drones dictionary with their starting positions
# Your code here

Hint

Use a dictionary with drone IDs as keys and tuples for positions.

2

Set the leader drone

Create a variable called leader and set it to the string 'drone1' to mark the leader drone

Drone Programming

drones = {'drone1': (10, 20), 'drone2': (15, 25), 'drone3': (12, 22), 'drone4': (18, 30)}
# Set the leader drone ID
# Your code here

Hint

Just assign the string 'drone1' to the variable leader.

3

Calculate relative positions

Use a dictionary comprehension to create a new dictionary called relative_positions where each drone's position is adjusted by subtracting the leader drone's x and y coordinates from its own coordinates. Use for drone, (x, y) in drones.items() to iterate.

Drone Programming

drones = {'drone1': (10, 20), 'drone2': (15, 25), 'drone3': (12, 22), 'drone4': (18, 30)}
leader = 'drone1'
# Calculate relative positions using dictionary comprehension
# Your code here

Hint

Subtract the leader's x and y from each drone's x and y inside the dictionary comprehension.

4

Print the relative positions

Write a print statement to display the relative_positions dictionary

Drone Programming

drones = {'drone1': (10, 20), 'drone2': (15, 25), 'drone3': (12, 22), 'drone4': (18, 30)}
leader = 'drone1'
relative_positions = {drone: (x - drones[leader][0], y - drones[leader][1]) for drone, (x, y) in drones.items()}
# Print the relative_positions dictionary
# Your code here

Hint

Use print(relative_positions) to show the result.

Practice

1. What is the main purpose of formation flying in drone programming?

easy

A. To make drones move together in set positions

B. To make drones fly randomly

C. To make drones land immediately

D. To make drones avoid flying

Solution

1. Step 1: Understand formation flying concept

   Formation flying means drones keep specific positions relative to each other.

2. Step 2: Identify the main goal

   The goal is to move drones together in a planned pattern, not randomly or to stop flying.

3. Final Answer:

   To make drones move together in set positions -> Option A

4. Quick Check:

   Formation flying = moving together [OK]

Hint: Formation flying means drones move together [OK]

Common Mistakes:

• Thinking drones fly randomly
• Confusing formation flying with landing
• Assuming drones avoid flying

2. Which of the following is the correct way to represent a drone's position in a formation list in Python?

easy

A. drone_positions = 0, 0, 1, 1, 2, 2

B. drone_positions = {0, 0, 1, 1, 2, 2}

C. drone_positions = [(0, 0), (1, 1), (2, 2)]

D. drone_positions = '0,0;1,1;2,2'

Solution

1. Step 1: Identify correct data structure for positions

   Positions are pairs of coordinates, best stored as tuples inside a list.

2. Step 2: Check each option

   drone_positions = [(0, 0), (1, 1), (2, 2)] uses a list of tuples, which is correct. Others use sets, strings, or invalid formats.

3. Final Answer:

   drone_positions = [(0, 0), (1, 1), (2, 2)] -> Option C

4. Quick Check:

   Positions as list of tuples = drone_positions = [(0, 0), (1, 1), (2, 2)] [OK]

Hint: Use list of tuples for positions [OK]

Common Mistakes:

• Using sets instead of lists
• Using strings instead of coordinate pairs
• Not grouping coordinates as tuples

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

positions = [(0,0), (1,1), (2,2)]
for i, pos in enumerate(positions):
    print(f"Drone {i} flies to {pos}")

medium

A. Drone 1 flies to (0, 0)
Drone 2 flies to (1, 1)
Drone 3 flies to (2, 2)

B. Drone 0 flies to (0, 0)
Drone 1 flies to (1, 1)
Drone 2 flies to (2, 2)

C. Drone 0 flies to 0
Drone 1 flies to 1
Drone 2 flies to 2

D. Error: enumerate() not defined

Solution

1. Step 1: Understand enumerate usage

   enumerate gives index and value from the list; here index is drone number, value is position tuple.

2. Step 2: Trace the loop output

   For i=0, pos=(0,0); i=1, pos=(1,1); i=2, pos=(2,2). The print statement formats these correctly.

3. Final Answer:

   Drone 0 flies to (0, 0) Drone 1 flies to (1, 1) Drone 2 flies to (2, 2) -> Option B

4. Quick Check:

   enumerate index + position tuple = Drone 0 flies to (0, 0) Drone 1 flies to (1, 1) Drone 2 flies to (2, 2) [OK]

Hint: enumerate gives index and item together [OK]

Common Mistakes:

• Starting drone count at 1 instead of 0
• Printing only numbers, not tuples
• Assuming enumerate is undefined

4. Identify the error in this code for sending commands to drones:

drones = ['D1', 'D2', 'D3']
positions = [(0,0), (1,1), (2,2)]
for i in range(len(drones)):
    print(f"Send {drones[i]} to position {positions}")

medium

A. print statement missing parentheses

B. drones list is empty

C. range(len(drones)) is invalid syntax

D. positions should be positions[i] to get each drone's position

Solution

1. Step 1: Check loop and indexing

   Loop correctly iterates over drone indices, but positions is printed as whole list, not single position.

2. Step 2: Fix position indexing

   Use positions[i] to get the matching position for each drone.

3. Final Answer:

   positions should be positions[i] to get each drone's position -> Option D

4. Quick Check:

   Match drone with single position = positions should be positions[i] to get each drone's position [OK]

Hint: Index positions with i to match drones [OK]

Common Mistakes:

• Printing whole positions list each time
• Assuming range(len(drones)) is wrong
• Forgetting to index positions

5. You want to program a formation where drones fly in a V shape. Which code snippet correctly assigns positions for 5 drones in this formation?

hard

A. positions = [(-2,2), (-1,1), (0,0), (1,1), (2,2)]

B. positions = [(0,0), (0,1), (0,2), (0,3), (0,4)]

C. positions = [(1,1), (2,2), (3,3), (4,4), (5,5)]

D. positions = [(0,0), (-1,-1), (-2,-2), (-3,-3), (-4,-4)]

Solution

1. Step 1: Understand V shape coordinates

   A V shape has drones spread left and right diagonally from center (0,0).

2. Step 2: Check each option's pattern

   positions = [(-2,2), (-1,1), (0,0), (1,1), (2,2)] has symmetric positions left and right diagonally, forming a V. Others are straight lines or one-sided.

3. Final Answer:

   positions = [(-2,2), (-1,1), (0,0), (1,1), (2,2)] -> Option A

4. Quick Check:

   V shape = symmetric diagonal positions [OK]

Hint: V shape means symmetric diagonal positions [OK]

Common Mistakes:

• Choosing straight line positions
• Not centering the formation
• Using only positive or negative coordinates