ROS Serial メモ

http://qiita.com/Yggdra070202/items/51cbc9bb594a5ab6a8c2 を参考にインストール

環境

ubuntu 14.04LTS
ROS jade
Arduino NANO/w328

Install

$ sudo apt-get install arduino
$ sudo apt-get install ros-jade-rosserial ros-jade-rosserial-arduino
$ arduino
フォルダ作成のための起動なので、起動したら終了する。
$ cd ~/catkin_ws/src
$ git clone https://github.com/ros-drivers/rosserial.git
$ cd ..
$ catkin_make
$ catkin_make install
$ source install/setup.bash

Arduinoのライブラリインストール
$ cd ~/sketchbook/libraries
$ rosrun rosserial_arduino make_libraries.py .
ros_libというフォルダができる。

テスト

$ arduino
ファイル->スケッチの例->ros_lib->HelloWorld
マイコンとか諸々を設定して書き込み
※マイコンが違うとrosrun rosserial_python serial_node.py /dev/ttyUSB0の時点で
Unable to sync with device; possible link problem or link software version mismatch such as hydro rosserial_python with groovy Arduino
というエラーが出た。。

$ roscore
(別端末で)$ rosrun rosserial_python serial_node.py /dev/ttyUSB0
(別端末で)$ rostopic echo /chater

Adafruit NeoPixel

D2,D3,D4,D5にNeoPixelを3個づつ付けたハードを考えます。

以下のスケッチで
/led_command トピックに文字列（RED,GREEN,BLUE,YELLOW,CYAN,PURPLE,WHITE)を送ることでLEDを表示させます。それ以外では消えるはずですが、OFFや0と言った文字列を送ると　エラーInbound TCP/IP connection failed: field data must be of type strが発生します。XXXとかなら大丈夫でした。

例
$ rostopic pub /led_command std_msgs/String "RED"

Arduino に　https://github.com/adafruit/Adafruit_NeoPixel　からライブラリを入れる必要があります。

# define max_led 128
# include <Adafruit_NeoPixel.h>

/*
 * rosserial PubSub Example
 * Prints "hello world!" and toggles led
 */

# include <ros.h>
# include <std_msgs/String.h>
# include <std_msgs/Empty.h>

ros::NodeHandle  nh;
Adafruit_NeoPixel led1 = Adafruit_NeoPixel(3, 2, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel led2 = Adafruit_NeoPixel(3, 3, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel led3 = Adafruit_NeoPixel(3, 4, NEO_GRB + NEO_KHZ800);
Adafruit_NeoPixel led4 = Adafruit_NeoPixel(3, 5, NEO_GRB + NEO_KHZ800);

void messageCb( const std_msgs::String& msg){
  const char RED[]="RED";
  const char GREEN[]="GREEN";
  const char BLUE[]="BLUE";
  const char YELLOW[]="YELLOW";
  const char CYAN[]="CYAN";
  const char PURPLE[]="PURPLE";
  const char WHITE[]="WHITE";
  //  digitalWrite(13, HIGH-digitalRead(13));   // blink the led
  if(strcmp(msg.data,RED)==0){
    for(int i=0;i<3;i++){
      led1.setPixelColor(i,led1.Color(max_led,0,0));
      led2.setPixelColor(i,led2.Color(max_led,0,0));
      led3.setPixelColor(i,led3.Color(max_led,0,0));
      led4.setPixelColor(i,led4.Color(max_led,0,0));
    }
    led1.show();
    led2.show();
    led3.show();
    led4.show();
  }
  else if(strcmp(msg.data,GREEN)==0){
    for(int i=0;i<3;i++){
      led1.setPixelColor(i,led1.Color(0,max_led,0));
      led2.setPixelColor(i,led2.Color(0,max_led,0));
      led3.setPixelColor(i,led3.Color(0,max_led,0));
      led4.setPixelColor(i,led4.Color(0,max_led,0));
    }
    led1.show();
    led2.show();
    led3.show();
    led4.show();
  }
  else if(strcmp(msg.data,BLUE)==0){
    for(int i=0;i<3;i++){
      led1.setPixelColor(i,led1.Color(0,0,max_led));
      led2.setPixelColor(i,led2.Color(0,0,max_led));
      led3.setPixelColor(i,led3.Color(0,0,max_led));
      led4.setPixelColor(i,led4.Color(0,0,max_led));
    }
    led1.show();
    led2.show();
    led3.show();
    led4.show();
  }
  else if(strcmp(msg.data,YELLOW)==0){
    for(int i=0;i<3;i++){
      led1.setPixelColor(i,led1.Color(max_led,max_led,0));
      led2.setPixelColor(i,led2.Color(max_led,max_led,0));
      led3.setPixelColor(i,led3.Color(max_led,max_led,0));
      led4.setPixelColor(i,led4.Color(max_led,max_led,0));
    }
    led1.show();
    led2.show();
    led3.show();
    led4.show();
  }
 else if(strcmp(msg.data,CYAN)==0){
    for(int i=0;i<3;i++){
      led1.setPixelColor(i,led1.Color(0,max_led,max_led));
      led2.setPixelColor(i,led2.Color(0,max_led,max_led));
      led3.setPixelColor(i,led3.Color(0,max_led,max_led));
      led4.setPixelColor(i,led4.Color(0,max_led,max_led));
    }
    led1.show();
    led2.show();
    led3.show();
    led4.show();
  }
 else if(strcmp(msg.data,PURPLE)==0){
    for(int i=0;i<3;i++){
      led1.setPixelColor(i,led1.Color(max_led,0,max_led));
      led2.setPixelColor(i,led2.Color(max_led,0,max_led));
      led3.setPixelColor(i,led3.Color(max_led,0,max_led));
      led4.setPixelColor(i,led4.Color(max_led,0,max_led));
    }
    led1.show();
    led2.show();
    led3.show();
    led4.show();
  }
 else if(strcmp(msg.data,WHITE)==0){
    for(int i=0;i<3;i++){
      led1.setPixelColor(i,led1.Color(max_led,max_led,max_led));
      led2.setPixelColor(i,led2.Color(max_led,max_led,max_led));
      led3.setPixelColor(i,led3.Color(max_led,max_led,max_led));
      led4.setPixelColor(i,led4.Color(max_led,max_led,max_led));
    }
    led1.show();
    led2.show();
    led3.show();
    led4.show();
  }
  else {
    for(int i=0;i<3;i++){
      led1.setPixelColor(i,led1.Color(0,0,0));
      led2.setPixelColor(i,led2.Color(0,0,0));
      led3.setPixelColor(i,led3.Color(0,0,0));
      led4.setPixelColor(i,led4.Color(0,0,0));
    }
    led1.show();
    led2.show();
    led3.show();
    led4.show();
  }
}

ros::Subscriber<std_msgs::String> sub("led_command", messageCb );



std_msgs::String str_msg;
ros::Publisher chatter("chatter", &str_msg);

char hello[13] = "hello world!";

void setup()
{
  pinMode(2, OUTPUT);
  pinMode(3, OUTPUT);
  pinMode(4, OUTPUT);
  pinMode(5, OUTPUT);
  pinMode(13, OUTPUT);

  led1.begin();
  led2.begin();
  led3.begin();
  led4.begin();

  nh.initNode();
  nh.advertise(chatter);
  nh.subscribe(sub);
}

void loop()
{
  str_msg.data = hello;
  chatter.publish( &str_msg );
  nh.spinOnce();
  delay(500);
}