$ rostopic list
/diagnostics
/head/tilt
/rosout
/rosout_agg
$ rostopic pub -1 /head/tiltstd_msgs/Float32 0.4
$ rostopic pub -1 /head/tilt std_msgs/Float320.9
Terry和Houndbot都是ROS机器人，以6061个铝合金零件制造而成。项目的目标是要尽量让这些机器人自主运动。
以下的Python脚本程序会监听「/head/tilt/smooth」的讯息，朝「/head/tilt」发布许多讯息，好让伺服机转到目标角度之前慢慢加速，再慢慢延迟旋转。当讯息抵达「/head/tilt/smooth」时一定会呼叫「moveServo_cb」。这个回调函式会从-90到+90度之间每10度产生1个数值，追加到角度数组当中。「sin()」会取这个角度，数值从-1到+1慢慢增加。该数值加1之后，范围就会变成0到+2，再除以2之后， 0到+1的曲线数值数组就完成了。然后再看看m数组当中，每当发布讯息时，就会稍微前进一点，范围在r之内，直到1*r或是全范围为止。
#!/usr/bin/env python
from time import sleep
import numpy as np
import rospy
pos = currentPosition + mi*r
print “pos: “, pos
pub.publish(pos)
sleep(0.05)
currentPosition = targetPosition
print “pos-e: “, currentPosition
pub.publish(currentPosition)
def listener():
if __name__ == ‘__main__’:
listener()
想要测试伺服机顺畅的动作，就要启动Python脚本，将讯息发布到「/head/tilt/smooth」，这样一来即可检视顺畅的动作。
$ ./servoencoder.py
$ rostopic pub -1 /head/tilt/smoothstd_msgs/Float32 1
$ rostopic pub -1 /head/tilt/smoothstd_msgs/Float32 0
ROS当中的名称也可以重新测绘。只要将「/head/tilt/smooth」重新测绘为「/head/tilt」，程序就能向伺服机发出命令，而不会意识到正弦曲线的数值在变化。






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