Added the christmas tree script

Author: ArisMorgens

examples/swarm/christmas_tree.py

@@ -0,0 +1,185 @@
+# -*- coding: utf-8 -*-
+#
+#     ||          ____  _ __
+#  +------+      / __ )(_) /_______________ _____  ___
+#  | 0xBC |     / __  / / __/ ___/ ___/ __ `/_  / / _ \
+#  +------+    / /_/ / / /_/ /__/ /  / /_/ / / /_/  __/
+#   ||  ||    /_____/_/\__/\___/_/   \__,_/ /___/\___/
+#
+#  Copyright (C) 2025 Bitcraze AB
+#
+#  This program is free software; you can redistribute it and/or
+#  modify it under the terms of the GNU General Public License
+#  as published by the Free Software Foundation; either version 2
+#  of the License, or (at your option) any later version.
+#
+#  This program is distributed in the hope that it will be useful,
+#  but WITHOUT ANY WARRANTY; without even the implied warranty of
+#  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+#  GNU General Public License for more details.
+# You should have received a copy of the GNU General Public License
+# along with this program. If not, see <https://www.gnu.org/licenses/>.
+"""
+Script for flying a swarm of 8 Crazyflies performing a coordinated spiral choreography
+resembling a Christmas tree outline in 3D space. Each drone takes off to a different
+height, flies in spiraling circular layers, and changes radius as it rises and descends,
+forming the visual structure of a cone when viewed from outside.
+
+The script is using the high level commanded and has been tested with 3 Crazyradios 2.0
+and the Lighthouse positioning system.
+"""
+import math
+import time
+
+import cflib.crtp
+from cflib.crazyflie.swarm import CachedCfFactory
+from cflib.crazyflie.swarm import Swarm
+from cflib.crazyflie.syncCrazyflie import SyncCrazyflie
+
+uri1 = 'radio://0/30/2M/E7E7E7E701'
+uri2 = 'radio://0/30/2M/E7E7E7E702'
+uri3 = 'radio://0/30/2M/E7E7E7E703'
+
+uri4 = 'radio://1/55/2M/E7E7E7E704'
+uri5 = 'radio://1/55/2M/E7E7E7E705'
+uri6 = 'radio://1/55/2M/E7E7E7E706'
+
+uri7 = 'radio://2/70/2M/E7E7E7E707'
+uri8 = 'radio://2/70/2M/E7E7E7E708'
+
+uris = [
+    uri1,
+    uri2,
+    uri3,
+    uri4,
+    uri5,
+    uri6,
+    uri7,
+    uri8,
+    # Add more URIs if you want more copters in the swarm
+]
+
+
+def arm(scf: SyncCrazyflie):
+    scf.cf.platform.send_arming_request(True)
+    time.sleep(1.0)
+
+
+# center of the spiral
+x0 = 0
+y0 = 0
+z0 = 0.5
+
+x_offset = 0.4  # Vertical distance between 2 layers
+z_offset = 0.5  # Radius difference between 2 layers
+
+starting_x = {
+    uri1: x0 + x_offset,
+    uri2: x0 + 2*x_offset,
+    uri3: x0 + 3*x_offset,
+    uri4: x0 + 4*x_offset,
+    uri5: x0 - x_offset,
+    uri6: x0 - 2*x_offset,
+    uri7: x0 - 3*x_offset,
+    uri8: x0 - 4*x_offset,
+}
+
+starting_z = {
+    uri1: z0 + 3*z_offset,
+    uri2: z0 + 2*z_offset,
+    uri3: z0 + z_offset,
+    uri4: z0,
+    uri5: z0 + 3*z_offset,
+    uri6: z0 + 2*z_offset,
+    uri7: z0 + z_offset,
+    uri8: z0,
+}
+
+starting_yaw = {
+    uri1: math.pi/2,
+    uri2: -math.pi/2,
+    uri3: math.pi/2,
+    uri4: -math.pi/2,
+    uri5: -math.pi/2,
+    uri6: math.pi/2,
+    uri7: -math.pi/2,
+    uri8: math.pi/2,
+
+}
+
+rotate_clockwise = {
+    uri1: False,
+    uri2: True,
+    uri3: False,
+    uri4: True,
+    uri5: False,
+    uri6: True,
+    uri7: False,
+    uri8: True,
+}
+
+takeoff_dur = {
+    uri: value / 0.4
+    for uri, value in starting_z.items()
+}
+
+
+def x_from_z(z):
+    cone_width = 4  # m
+    cone_height = 5  # m
+    """
+    Returns the radius of the tree with a given z.
+    """
+    return cone_width/2 - (cone_width/cone_height) * z
+
+
+def run_shared_sequence(scf: SyncCrazyflie):
+    circle_duration = 5  # Duration of a full-circle
+    commander = scf.cf.high_level_commander
+    uri = scf._link_uri
+
+    commander.takeoff(starting_z[uri], takeoff_dur[uri])
+    time.sleep(max(takeoff_dur.values())+1)
+
+    # Go to the starting position
+    commander.go_to(starting_x[uri], y0, starting_z[uri], starting_yaw[uri], 4)
+    time.sleep(5)
+
+    # Full circle with ascent=0
+    commander.spiral(2*math.pi, abs(starting_x[uri]), abs(starting_x[uri]),
+                     ascent=0, duration_s=circle_duration, sideways=False, clockwise=rotate_clockwise[uri])
+    time.sleep(circle_duration+1)
+
+    # Half circle with ascent=-0.5m
+    commander.spiral(math.pi, abs(starting_x[uri]), x_from_z(starting_z[uri]-0.5*z_offset),
+                     ascent=-0.5*z_offset, duration_s=0.5*circle_duration, sideways=False,
+                     clockwise=rotate_clockwise[uri])
+    time.sleep(0.5*circle_duration+0.5)
+
+    # Full circle with ascent=+1.0m
+    commander.spiral(2*math.pi, x_from_z(starting_z[uri]-0.5*z_offset), x_from_z(starting_z[uri]+0.5*z_offset),
+                     ascent=z_offset, duration_s=circle_duration, sideways=False,
+                     clockwise=rotate_clockwise[uri])
+    time.sleep(circle_duration+1)
+
+    # Half circle with ascent=-0.5m
+    commander.spiral(math.pi, x_from_z(starting_z[uri]+0.5*z_offset), x_from_z(starting_z[uri]),
+                     ascent=-0.5*z_offset, duration_s=0.5*circle_duration, sideways=False,
+                     clockwise=rotate_clockwise[uri])
+    time.sleep(0.5*circle_duration+1)
+
+    commander.land(0, takeoff_dur[uri])
+    time.sleep(max(takeoff_dur.values())+3)
+
+
+if __name__ == '__main__':
+    cflib.crtp.init_drivers()
+    factory = CachedCfFactory(rw_cache='./cache')
+    with Swarm(uris, factory=factory) as swarm:
+        # swarm.reset_estimators()
+        time.sleep(0.5)
+        print('arming...')
+        swarm.parallel_safe(arm)
+        print('starting sequence...')
+        swarm.parallel_safe(run_shared_sequence)
+        time.sleep(1)