Pcb-designHow-ToBeginner · 4 min read

Drone Project for Search and Rescue: Basic Programming Guide

A drone project for search and rescue involves programming the drone to autonomously scan an area using GPS waypoints, camera image processing to detect targets, and obstacle avoidance to navigate safely. You can use drone SDKs like DroneKit or DJI SDK to control flight and integrate sensors for real-time decision making.

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Syntax

This is a basic pattern to program a drone for search and rescue:

Connect to drone: Establish communication with the drone using its SDK.
Define search area: Use GPS coordinates to set waypoints for the drone to follow.
Flight control: Command the drone to take off, fly to waypoints, and land.
Sensor integration: Use camera input to detect targets and obstacle sensors to avoid collisions.
Decision making: Process sensor data to identify rescue targets and adjust flight path.

python

from dronekit import connect, VehicleMode, LocationGlobalRelative
import time

# Connect to the vehicle
vehicle = connect('127.0.0.1:14550', wait_ready=True)

# Function to arm and takeoff
def arm_and_takeoff(target_altitude):
    print("Arming motors")
    vehicle.mode = VehicleMode("GUIDED")
    vehicle.armed = True

    while not vehicle.armed:
        print(" Waiting for arming...")
        time.sleep(1)

    print(f"Taking off to {target_altitude} meters")
    vehicle.simple_takeoff(target_altitude)

    while True:
        print(f" Altitude: {vehicle.location.global_relative_frame.alt}")
        if vehicle.location.global_relative_frame.alt >= target_altitude * 0.95:
            print("Reached target altitude")
            break
        time.sleep(1)

# Define waypoints
waypoints = [
    LocationGlobalRelative(-35.363261, 149.165230, 20),
    LocationGlobalRelative(-35.363000, 149.165000, 20),
    LocationGlobalRelative(-35.362500, 149.165500, 20)
]

# Fly to waypoints
arm_and_takeoff(20)
for point in waypoints:
    print(f"Flying to waypoint {point}")
    vehicle.simple_goto(point)
    time.sleep(30)  # wait to reach waypoint

print("Landing")
vehicle.mode = VehicleMode("LAND")

# Close vehicle object
vehicle.close()

Output

Arming motors Waiting for arming... Taking off to 20 meters Altitude: 0.5 Altitude: 5.0 Altitude: 10.0 Altitude: 19.5 Reached target altitude Flying to waypoint LocationGlobalRelative(-35.363261, 149.16523, 20) Flying to waypoint LocationGlobalRelative(-35.363, 149.165, 20) Flying to waypoint LocationGlobalRelative(-35.3625, 149.1655, 20) Landing

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Example

This example shows how to program a drone to take off, fly through GPS waypoints, and land safely. It uses the DroneKit Python library to control the drone's flight path.

python

from dronekit import connect, VehicleMode, LocationGlobalRelative
import time

# Connect to the drone
vehicle = connect('127.0.0.1:14550', wait_ready=True)

# Function to arm and take off to a target altitude
def arm_and_takeoff(aTargetAltitude):
    print("Basic pre-arm checks")
    while not vehicle.is_armable:
        print(" Waiting for vehicle to initialise...")
        time.sleep(1)

    print("Arming motors")
    vehicle.mode = VehicleMode("GUIDED")
    vehicle.armed = True

    while not vehicle.armed:
        print(" Waiting for arming...")
        time.sleep(1)

    print(f"Taking off to {aTargetAltitude} meters")
    vehicle.simple_takeoff(aTargetAltitude)

    while True:
        print(f" Altitude: {vehicle.location.global_relative_frame.alt}")
        if vehicle.location.global_relative_frame.alt >= aTargetAltitude * 0.95:
            print("Reached target altitude")
            break
        time.sleep(1)

# Define waypoints for search area
waypoints = [
    LocationGlobalRelative(-35.363261, 149.165230, 20),
    LocationGlobalRelative(-35.363000, 149.165000, 20),
    LocationGlobalRelative(-35.362500, 149.165500, 20)
]

# Start mission
arm_and_takeoff(20)

for point in waypoints:
    print(f"Flying to waypoint {point}")
    vehicle.simple_goto(point)
    time.sleep(30)  # wait to reach waypoint

print("Landing")
vehicle.mode = VehicleMode("LAND")

# Close vehicle connection
vehicle.close()

Output

Basic pre-arm checks Waiting for vehicle to initialise... Arming motors Waiting for arming... Taking off to 20 meters Altitude: 0.5 Altitude: 5.0 Altitude: 10.0 Altitude: 19.5 Reached target altitude Flying to waypoint LocationGlobalRelative(-35.363261, 149.16523, 20) Flying to waypoint LocationGlobalRelative(-35.363, 149.165, 20) Flying to waypoint LocationGlobalRelative(-35.3625, 149.1655, 20) Landing

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Common Pitfalls

1. Not waiting for drone to arm: Trying to take off before the drone is armed causes errors.

2. Ignoring GPS signal quality: Poor GPS can cause wrong waypoints or unstable flight.

3. Not handling obstacles: Without obstacle avoidance, the drone may crash during search.

4. Skipping sensor data processing: Missing target detection logic means the drone won't identify rescue subjects.

python

## Wrong: Taking off before arming
vehicle.mode = VehicleMode("GUIDED")
vehicle.simple_takeoff(10)  # This will fail if not armed

## Right: Wait for arming before takeoff
vehicle.mode = VehicleMode("GUIDED")
vehicle.armed = True
while not vehicle.armed:
    time.sleep(1)
vehicle.simple_takeoff(10)

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Quick Reference

Connect: Use connect() with correct address.
Arm and takeoff: Always check is_armable and wait for armed status.
Waypoints: Define GPS points with altitude for search path.
Flight commands: Use simple_goto() to move drone.
Landing: Switch mode to LAND to safely land.

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Key Takeaways

Use GPS waypoints and camera input to program autonomous search paths.

Always wait for the drone to arm before takeoff to avoid errors.

Integrate obstacle avoidance to prevent crashes during missions.

Process sensor data to detect rescue targets effectively.

Use drone SDKs like DroneKit for easy flight control and mission planning.