Communication between drones in Drone Programming - Mini Project: Build & Apply

Communication between drones

📖 Scenario: You are programming a group of drones that need to share messages with each other to coordinate their tasks. Each drone has a unique ID and can send messages to other drones in the group.

🎯 Goal: Build a simple program that stores messages sent between drones and shows the messages received by each drone.

📋 What You'll Learn

Create a dictionary called drones with drone IDs as keys and empty lists as values to hold messages.

Create a variable called message with the text to send.

Write a loop that sends the message from one drone to another by adding it to the receiver's message list.

Print the messages received by each drone.

💡 Why This Matters

🌍 Real World

Drones often need to share information like location, status, or commands to work together safely and efficiently.

💼 Career

Understanding how to manage communication between devices is important for roles in robotics, automation, and IoT (Internet of Things) development.

1

Set up drones with empty message lists

Create a dictionary called drones with these exact keys: "drone1", "drone2", and "drone3". Each key should have an empty list [] as its value.

Drone Programming

# Create the drones dictionary with empty message lists
# Your code here

Hint

Use curly braces {} to create a dictionary. Each drone ID is a key with an empty list [] as the value.

2

Create a message to send

Create a variable called message and set it to the string "Hello from drone1".

Drone Programming

drones = {
    "drone1": [],
    "drone2": [],
    "drone3": []
}
# Create the message variable
# Your code here

Hint

Use = to assign the string to the variable message.

3

Send the message from drone1 to drone2 and drone3

Use a for loop with the variable receiver to go through the list ["drone2", "drone3"]. Inside the loop, add the message to the list of messages for each receiver in the drones dictionary.

Drone Programming

drones = {
    "drone1": [],
    "drone2": [],
    "drone3": []
}
message = "Hello from drone1"
# Send the message to drone2 and drone3
# Your code here

Hint

Use append() to add the message to each receiver's list.

4

Show messages received by each drone

Use a for loop with variables drone and messages to go through drones.items(). Inside the loop, print the drone ID and its messages in this exact format: "drone1 received: []".

Drone Programming

drones = {
    "drone1": [],
    "drone2": [],
    "drone3": []
}
message = "Hello from drone1"
for receiver in ["drone2", "drone3"]:
    drones[receiver].append(message)
# Print messages received by each drone
# Your code here

Hint

Use an f-string to format the print output exactly as shown.

Practice

1. What is the main purpose of communication between drones in a fleet?

easy

A. To share important information and coordinate tasks

B. To recharge each other's batteries

C. To change their physical appearance

D. To compete for the strongest signal

Solution

1. Step 1: Understand drone communication purpose

   Drones communicate to share data and work together efficiently.

2. Step 2: Identify correct purpose from options

   Only To share important information and coordinate tasks mentions sharing information and coordination, which matches the purpose.

3. Final Answer:

   To share important information and coordinate tasks -> Option A

4. Quick Check:

   Communication = Share info and coordinate [OK]

Hint: Communication means sharing info, not physical changes [OK]

Common Mistakes:

• Thinking drones recharge each other
• Confusing communication with appearance changes
• Assuming drones compete instead of cooperate

2. Which of the following is the correct way to send a message from drone A to drone B in drone_programming?

easy

A. send_message(droneA, droneB, 'Hello')

B. droneB.receive_message(droneA.send_message('Hello'))

C. droneA.send_message('Hello').to(droneB)

D. droneA.message('Hello') -> droneB

Solution

1. Step 1: Understand message sending syntax

   In drone_programming, a drone sends a message by calling send_message, and the receiver uses receive_message.

2. Step 2: Check which option matches this syntax

   droneB.receive_message(droneA.send_message('Hello')) shows droneA sending and droneB receiving correctly.

3. Final Answer:

   <code>droneB.receive_message(droneA.send_message('Hello'))</code> -> Option B

4. Quick Check:

   Send then receive method call = droneB.receive_message(droneA.send_message('Hello')) [OK]

Hint: Send message from sender, receive on receiver drone [OK]

Common Mistakes:

• Using wrong method names
• Trying to chain send_message with .to()
• Incorrect function call order

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

droneA.inbox = []
droneB.inbox = []
message = droneA.send_message('Status update')
droneB.receive_message(message)
print(droneB.inbox)

medium

A. ['Status update']

B. []

C. ['Status update', 'Status update']

D. Error: inbox attribute missing

Solution

1. Step 1: Trace message sending and receiving

   droneA sends 'Status update', droneB receives it and adds to inbox.

2. Step 2: Check droneB's inbox content after receiving

   Inbox contains one message: ['Status update'].

3. Final Answer:

   ['Status update'] -> Option A

4. Quick Check:

   Inbox after receive_message = ['Status update'] [OK]

Hint: Received messages go into inbox list [OK]

Common Mistakes:

• Assuming inbox stays empty
• Thinking message duplicates
• Expecting attribute errors

4. Identify the error in this drone communication code:

droneA.inbox = []
droneB.inbox = []
message = droneA.send_message('Ready')
droneB.receive_message(message)
print(droneA.inbox)

medium

A. print statement syntax is incorrect

B. send_message method is missing parentheses

C. receive_message should be called on droneA, not droneB

D. droneA.inbox is printed but droneA never received messages

Solution

1. Step 1: Analyze message flow

   droneA sends message, droneB receives it, so droneB's inbox changes, not droneA's.

2. Step 2: Check printed inbox

   Printing droneA.inbox shows empty because droneA did not receive any message.

3. Final Answer:

   droneA.inbox is printed but droneA never received messages -> Option D

4. Quick Check:

   Inbox printed is sender's, but sender has no received messages [OK]

Hint: Print inbox of receiver, not sender [OK]

Common Mistakes:

• Confusing sender and receiver inboxes
• Missing parentheses on method calls
• Wrong drone calling receive_message

5. You want to make sure droneC only processes messages from droneA and ignores others. Which code snippet correctly implements this filtering?

def process_inbox(droneC):
    for msg in droneC.inbox:
        if msg.sender_id == 'droneA':
            print(f"Processing: {msg.content}")
        else:
            print("Ignoring message")

hard

A. The else block should delete the message from inbox

B. The code should check msg.receiver_id instead of sender_id

C. The code correctly checks sender_id before processing messages

D. The for loop should iterate over droneA.inbox, not droneC.inbox

Solution

1. Step 1: Understand message filtering logic

   Filtering by sender_id ensures only messages from droneA are processed.

2. Step 2: Verify code matches filtering goal

   Code checks msg.sender_id == 'droneA' and processes accordingly, which is correct.

3. Final Answer:

   The code correctly checks sender_id before processing messages -> Option C

4. Quick Check:

   Filter by sender_id = correct filtering [OK]

Hint: Filter messages by sender_id to process only desired drones [OK]

Common Mistakes:

• Checking receiver_id instead of sender_id
• Trying to delete messages in else block unnecessarily
• Iterating wrong drone's inbox