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Turbot与python教程-实现后退

Turbot与python教程-实现后退

说明:

  • 介绍如何实现通过python控制turbot后退

代码:

  • 参考代码:github
  • 实现代码:
# A very basic TurtleBot script that moves TurtleBot forward indefinitely. Press CTRL + C to stop.  To run:
# On TurtleBot:
# roslaunch turtlebot_bringup minimal.launch
# On work station:
# python goBack.py

import rospy
from geometry_msgs.msg import Twist

class GoForward():
    def __init__(self):
        # initiliaze
        rospy.init_node('GoForward', anonymous=False)

    # tell user how to stop TurtleBot
    rospy.loginfo("To stop TurtleBot CTRL + C")

        # What function to call when you ctrl + c    
        rospy.on_shutdown(self.shutdown)
        
    # Create a publisher which can "talk" to TurtleBot and tell it to move
        # Tip: You may need to change cmd_vel_mux/input/navi to /cmd_vel if you're not using TurtleBot2
        self.cmd_vel = rospy.Publisher('cmd_vel_mux/input/navi', Twist, queue_size=10)
     
    #TurtleBot will stop if we don't keep telling it to move.  How often should we tell it to move? 10 HZ
        r = rospy.Rate(10);

        # Twist is a datatype for velocity
        move_cmd = Twist()
    # let's go forward at 0.2 m/s
        move_cmd.linear.x =  -0.2
    # let's turn at 0 radians/s
    move_cmd.angular.z = 0

    # as long as you haven't ctrl + c keeping doing...
        while not rospy.is_shutdown():
        # publish the velocity
            self.cmd_vel.publish(move_cmd)
        # wait for 0.1 seconds (10 HZ) and publish again
            r.sleep()
                        
        
    def shutdown(self):
        # stop turtlebot
        rospy.loginfo("Stop TurtleBot")
    # a default Twist has linear.x of 0 and angular.z of 0.  So it'll stop TurtleBot
        self.cmd_vel.publish(Twist())
    # sleep just makes sure TurtleBot receives the stop command prior to shutting down the script
        rospy.sleep(1)
 
if __name__ == '__main__':
    try:
        GoForward()
    except:
        rospy.loginfo("GoForward node terminated.")
  • move_cmd.linear.x = -0.2 实现每秒0.2m/s速度后退

演示:

  • 主机,新终端,启动底盘
$ roslaunch turbot_bringup minimal.launch
  • 从机,新终端,启动脚本
$ rosrun turbot_code goBack.py

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标签: turbot与python入门教程