This example demonstrates how to arm and launch a Copter in GUIDED mode, travel towards a number of target points, and then return
to the home location. It uses
The target locations are centered around the home location when the Simulated Vehicle is booted; you can edit the latitude and longitude to use more appropriate positions for your own vehicle.
This example will only run on Copter:
takeoffin GUIDED mode.
takeoffcommand and will then stick at the altitude check.
In summary, after cloning the repository:
Navigate to the example folder as shown:
You can run the example against a simulator (DroneKit-SITL) by specifying the Python script without any arguments. The example will download SITL binaries if needed, start the simulator, and then connect to it:
On the command prompt you should see (something like):
Starting copter simulator (SITL) SITL already Downloaded. Connecting to vehicle on: tcp:127.0.0.1:5760 >>> APM:Copter V3.3 (d6053245) >>> Frame: QUAD >>> Calibrating barometer >>> Initialising APM... >>> barometer calibration complete >>> GROUND START Basic pre-arm checks Waiting for vehicle to initialise... ... Waiting for vehicle to initialise... Arming motors Waiting for arming... ... Waiting for arming... >>> ARMING MOTORS >>> GROUND START Waiting for arming... >>> Initialising APM... Taking off! Altitude: 0.0 ... Altitude: 7.4 Altitude: 9.0 Altitude: 9.65 Reached target altitude Set default/target airspeed to 3 Going towards first point for 30 seconds ... Going towards second point for 30 seconds (groundspeed set to 10 m/s) ... Returning to Launch Close vehicle object
It is more interesting to watch the example run on a map than the console. The topic Connecting an additional Ground Station explains how to set up Mission Planner to view a vehicle running on the simulator (SITL).
You can run the example against a specific connection (simulated or otherwise) by passing the connection string for your vehicle in the
For example, to connect to SITL running on UDP port 14550 on your local computer:
python simple_goto.py --connect 127.0.0.1:14550
The code has three distinct sections: arming and takeoff, flight to two locations, and return-to-home.
To launch Copter you need to first check that the vehicle
Then set the mode to
GUIDED, arm the vehicle, and call
Vehicle.simple_takeoff(). The takeoff code in this example
is explained in the guide topic Taking Off.
# set the default travel speed vehicle.airspeed=3 point1 = LocationGlobalRelative(-35.361354, 149.165218, 20) vehicle.simple_goto(point1) # sleep so we can see the change in map time.sleep(30)
Without some sort of “wait” the next command would be executed immediately. In this example we just sleep for 30 seconds before executing the next command.
The script doesn’t report anything during the sleep periods, but you can observe the vehicle’s movement on a ground station map.
To return to the home position and land, we set the mode to
The vehicle travels at the previously set default speed:
vehicle.mode = VehicleMode("RTL")
The full source code at documentation build-time is listed below (current version on Github):
#!/usr/bin/env python # -*- coding: utf-8 -*- """ © Copyright 2015-2016, 3D Robotics. simple_goto.py: GUIDED mode "simple goto" example (Copter Only) Demonstrates how to arm and takeoff in Copter and how to navigate to points using Vehicle.simple_goto. Full documentation is provided at http://python.dronekit.io/examples/simple_goto.html """ from dronekit import connect, VehicleMode, LocationGlobalRelative import time #Set up option parsing to get connection string import argparse parser = argparse.ArgumentParser(description='Commands vehicle using vehicle.simple_goto.') parser.add_argument('--connect', help="Vehicle connection target string. If not specified, SITL automatically started and used.") args = parser.parse_args() connection_string = args.connect sitl = None #Start SITL if no connection string specified if not connection_string: import dronekit_sitl sitl = dronekit_sitl.start_default() connection_string = sitl.connection_string() # Connect to the Vehicle print 'Connecting to vehicle on: %s' % connection_string vehicle = connect(connection_string, wait_ready=True) def arm_and_takeoff(aTargetAltitude): """ Arms vehicle and fly to aTargetAltitude. """ print "Basic pre-arm checks" # Don't try to arm until autopilot is ready while not vehicle.is_armable: print " Waiting for vehicle to initialise..." time.sleep(1) print "Arming motors" # Copter should arm in GUIDED mode vehicle.mode = VehicleMode("GUIDED") vehicle.armed = True # Confirm vehicle armed before attempting to take off while not vehicle.armed: print " Waiting for arming..." time.sleep(1) print "Taking off!" vehicle.simple_takeoff(aTargetAltitude) # Take off to target altitude # Wait until the vehicle reaches a safe height before processing the goto (otherwise the command # after Vehicle.simple_takeoff will execute immediately). while True: print " Altitude: ", vehicle.location.global_relative_frame.alt #Break and return from function just below target altitude. if vehicle.location.global_relative_frame.alt>=aTargetAltitude*0.95: print "Reached target altitude" break time.sleep(1) arm_and_takeoff(10) print "Set default/target airspeed to 3" vehicle.airspeed = 3 print "Going towards first point for 30 seconds ..." point1 = LocationGlobalRelative(-35.361354, 149.165218, 20) vehicle.simple_goto(point1) # sleep so we can see the change in map time.sleep(30) print "Going towards second point for 30 seconds (groundspeed set to 10 m/s) ..." point2 = LocationGlobalRelative(-35.363244, 149.168801, 20) vehicle.simple_goto(point2, groundspeed=10) # sleep so we can see the change in map time.sleep(30) print "Returning to Launch" vehicle.mode = VehicleMode("RTL") #Close vehicle object before exiting script print "Close vehicle object" vehicle.close() # Shut down simulator if it was started. if sitl is not None: sitl.stop()