就如各位所見，使用ROS之后，一般的循環(huán)函數(shù)就會變得相當(dāng)簡單。循環(huán)函數(shù)只會訂閱（subscribe）數(shù)據(jù)，任何Arduino循環(huán)都一樣。設(shè)定時要將ROS初始化，將各個ROS訊息訂閱者的訂閱叫出來。每個訂閱者會占據(jù)Arduino的RAM，數(shù)量取決于要用程序代碼做什么，以6個到12個為限。

#include

#include

#include

#include

#define SERVOPIN 3

Servo servo;

void servo_cb( const std_msgs::Float32& msg )

{

const float min = 45;

const float range = 90;

float v = msg.data;

if( v > 1 ) v = 1;

接下來要設(shè)法透過Arduino在ROS的世界說話。最簡單的方法是使用機器人啟動檔。雖然以下的檔案內(nèi)容非常簡單，但是這里要追加啟動檔，如此一來即使是非常復(fù)雜的機器人，也能用一個指令啟動。

$ cat rosservo.launch

$ roslaunch ./rosservo.lanch

rostopic指令可以看出ROS訊息傳送到機器人的哪個部位。看了下面的程序代碼就會發(fā)現(xiàn)，「/head/tilt」可以透過Arduino使用。訊息要使用「rostopic」傳送。-1的選項只會發(fā)布（publish）訊息一次，通知/head/tilt傳送一個浮點數(shù)。

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