新车间 [XinCheJian]

Another exciting afternoon racing robots with friends. 😉

Taken by @vnsavitri

Taken by Ricky

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Participants last preparations:

Participants self presentation:

Racing!

The Winners: Nelson Zhang (Autonomous Wall-E) and Michael Liao (Remote controlled Tank)
A big THANK to Shanda Innovations for sponsoring 2 E-Book readers as prices for the winners!

Roborace Contestants and their Creators:

Thumbs up to all the participants for their great work! Thank you to Shanda Innovations for being our generous sponsor! Thank you to TimeOut magazine for featuring our event! Thank you to DFRobot and RoboticFan particularly Ricky Ye and Rocky for co-organizing this event! Thank you to XinDanWei for promoting our event! Thank you to everyone who visited us yesterday! Thank you to those who cannot come for your mental support! Thank you to Andi for the great poster and flyer design! Thank you to Paul for sponsoring the posters printouts! Thank you to Bindy for helping out on translations and selling drinks! Thank you to Michael for sponsoring his E-book for next competition and buying drinks to the participants! Thank you to John for helping out on event organization! Thank you to Airie for promoting the event on RenRen! Thank you to Min Lin for promoting, coordinating and organizing the event!

We’re planning to have the next Roboracing at the end of August, stay tuned!

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This event is open to everyone, please bring your friends and family! Register here. The competition will be in 2 parts: * Autonomous robot car racing * Remote controlled robot car racing ==>Competition Rules<== If you wish to become participant at the racing, please send email to: [email protected] If you wish to become sponsor of this event, please send email to: [email protected] Here’s some pictures of the last Roboracing event.

Registered teams:

Team 1: Lauren Pan (Toy car modification robot) Team 2: Barry Xu (DIY robot) Team 3: Daniel (2WD Mobile robot kit) Team 4: Zhang Chen (Andriod control HCR) Team 5: Jiang Gui Long/Wu Tao/Zhang Jie ( Android Control HCR) Team 6: Rockets (Tank mobile robot) Team 7: Unknown (LEGO mobile robot) Team 8: Ricky Ye (HCR robot) Team 9: Ricky Ng-Adam (Autonomous robot toy car – ART) Team 10: Lutz Michaelis (Autonomous Beetleduino) Team 11: Paul Adams (Hoverbot Hubert) Team 12: Nelson Zhang (Autonomous Wall-E) Team 13: Lionello Lunesu (LEGO mobile robot) Team 14: David Li (Soccerbot) ]]>

Android Open Accessory Development Kit.

The Android 3.1 platform (also backported to Android 2.3.4) introduces Android Open Accessory support, which allows external USB hardware (an Android USB accessory) to interact with an Android-powered device in a special “accessory” mode. When an Android-powered powered device is in accessory mode, the connected accessory acts as the USB host (powers the bus and enumerates devices) and the Android-powered device acts as the USB device. Android USB accessories are specifically designed to attach to Android-powered devices and adhere to a simple protocol (Android accessory protocol) that allows them to detect Android-powered devices that support accessory mode.

Workshops are weekly and will explore both the development on the Android-side and the micro-controllers side – touching on all aspects of mechanical, electrical and software engineering of a robot. In particular, we will look together at the use of ADK-compatible hardware boards, such as the Google IOIO board or new hardware offerings from Seeedstudio. Participation for XinCheJian members who’ve paid their dues is free. For the non-members, the fee is 50 RMB per workshop. For more information, look at the “Android & Robots” wiki. Don’t forget to fulfill the necessary pre-requisites and join the [email protected] mailing list! Note that this is a collaborative workshop, so we expect everyone to contribute and participate actively.

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Racing track mock-up and simulation with Google SketchUp

Some video

Some Pictures

http://bbs.roboticfan.com/showtopic-9231.aspx]]>

We got full house this Sunday with 13 people doing Insect Bot workshop including 10 kids. It’s a lot of fun and most of insect got to walk.

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遥控小车的改造 May 3rd, 2011

今天完成了遥控车的改造，这是自主控制的第一步。这辆车是在淘宝上买的，结构很简单，控制很简陋。方向就是将电机打死，这时候电流会非常大，而且对于将来的自主移动的精细控制带来不利因素。所以很早就想把它改成舵机控制的了，下面就是整个改造的过程。

这就是需要改造的部分。

先将需要改造的部分画下来，便于设计框架结构。我不是机械出身的，所以就画个大概吧。

结构图完成

在图纸上设计新的结构

根据设计切割材料

最后完成的样子，由于是临时电路，也就没固定，看上去有点像垃圾车-_-b

改造部分的特写

再来一张

这些只是机械部份，然后就是控制部份。由于舵机能够转动的角度范围到180度，而该车的转向轮仅能转动在30-40度之间。同时，自主移动机器人目标是在Arduino上面开发。所以我就一步到位，先用Arduino读取天地飞的pwm信号，然后经过转换，输出新的pwm信号给舵机，这样就不会因为卡住而损坏舵机了。

最后效果如下

http://v.youku.com/v_show/id_XMjYzOTc2NzA4.html

使用的程序非常简单，如下：

#include <Servo.h>
//Author:	HE Qichen
//Date:	2011-5-3
//Website:	http://gaishi.vicp.net
//Email:	heqichen(a)gaishi.vicp.net
Servo directionServo;
void setup()
{
  pinMode(2, INPUT);
  directionServo.attach(3);
}
void loop()
{
  int t, a;
  t = pulseIn(2, HIGH);
  a = map(t, 1000, 2000, 65, 115);
  directionServo.write(a);
}

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Arduino读取g-sensor数据 May 2nd, 2011

在四轴飞行器上除了要有陀螺仪外，还要有个重要的传感器就是重力传感器。由于它们各自的误差，若使用单一的传感器会造成严重的精读问题，使飞行器丧失稳定性。所以要用两个传感器进行相互矫正。

现在重力传感器应用非常广，目前iphone等智能手机上都有重力传感器，包括笔者的一台山寨手机上都有重力传感器。

这次就是要用Android来读取重力传感器的数据。这个重力传感器模块是从淘宝购买的，模块非常简单，自己够买芯片来焊接也不成问题。根据它的datasheet，就能够知道如何使用这款重力加速度模块了。下面就进行详细的介绍

这个模块使用的芯片型号是MMA7260Q，(datasheet下载[PDF,229KB])，测试中的电路就是下面图片中的样子

控制的目标是通过重力传感器的数据来控制舵机的转动。但是发现会有少量的抖动，于是在程序中加入了一个简单的滤波器，阶数没有仔细调，但是基本上能够进行控制了。

http://v.youku.com/v_show/id_XMjYzNjIyODIw.html

下面是芯片的特写

下面是用到的代码

#include <Servo.h>
//Author:  HE Qichen
//Email:  heqichen(a)gaishi.vicp.net
//Website:  http://gaishi.vicp.net
//Date:  2011-5-2
#define FILTER_LEVEL  3
class Filter
{
  private:
    int buffer[FILTER_LEVEL];
  public:
    Filter()
    {
      int i;
      for (i=0; i<FILTER_LEVEL; ++i)
      {
        buffer[i] = 0;
      }
    }
    int filter(int value)
    {
      int i;
      int sum;
      for (i=0; i<FILTER_LEVEL-1; ++i)
      {
        buffer[i] = buffer[i+1];
      }
      buffer[FILTER_LEVEL-1] = value;
      sum = 0;
      for (i=0; i<FILTER_LEVEL; ++i)
      {
        sum += buffer[i];
      }
      return sum / FILTER_LEVEL;
    }
};
Servo testServo;
Filter xFilter, yFilter, zFilter;
void setup()
{
  Serial.begin(9600);
  testServo.attach(2);
}
void loop()
{
  int gx, gy, gz;
  gx = analogRead(A0);
  gy = analogRead(A1);
  gz = analogRead(A2);
  Serial.print("x: ");
  Serial.print(gx, DEC);
  Serial.print("  y: ");
  Serial.print(gy, DEC);
  Serial.print("  z: ");
  Serial.println(gz, DEC);
  int fgx, fgy, fgz;
  fgx = xFilter.filter(gx);
  fgy = yFilter.filter(gy);
  fgz = zFilter.filter(gz);
  Serial.print("  fx: ");
  Serial.print(fgx, DEC);
  Serial.print("  fy: ");
  Serial.print(fgy, DEC);
  Serial.print("  fz: ");
  Serial.println(fgz, DEC);
  testServo.write((fgz-100)/3);
  //delay(10);
}

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嵌入之梦-圆梦小车开发 May 1st, 2011

今天看到一台嵌入之梦的小车，但是上电之后发了疯似的乱跑，所以刷之。但新车间却没有网络，没办法，自己一点一点试。。结果如下

CT1	接受pwm，控制速度
CT2	前进控制信号，高电位转动
CT3	后退控制信号，高电位转动

但是由于小车上的UNO与我的Ubuntu连接有问题，貌似只有Windows是好的，Mac OS有时也会出问题。所以最后车上改用了Mega 1280。

但是又发现一个问题，就是Arduino使用USB供电的时候很正常，然而，使用车上接出来的5V电源时，程序就会混乱，完全没有一点规律。猜测可能是由于电机转动导致整个系统的电压下降，无法提供足够的电压给Arduino的板子上。这大概也是之前uno不会发疯的原因。没办法，在小车上再接一块9V层叠式电池，作为Arduino的电源。最后终于行了。

后面程序的作用是往前走，遇到前方有物体是后退，打弯，然后继续往前，一个简单的壁障程序。没有用到速度控制。下面就是这个小车最后的样子，手机拍的，将就看吧

左侧照

右侧照

再来一张

http://v.youku.com/v_show/id_XMjYzMzY0NzA0.html

用到的程序就是下面的

//Author:	HE Qichen
//Email:	heqichen(a)gaishi.vicp.net
//Website:	http://gaishi.vicp.net
//Date:	2011-5-1
int status;
#define LEFT_SPEED   6
#define LEFT_FORWARD  7
#define LEFT_BACKWARD  8
#define RIGHT_SPEED  10
#define RIGHT_FORWARD  11
#define RIGHT_BACKWARD  12
#define ULTRASONIC_ECHO  3
#define ULTRASONIC_TRIG  4
#define NORMAL_SPEED  100
#define STOP_SPEED  0
void setup()
{
  Serial.begin(9600);
  setupMove();
  setupUltrasonic();
}
void loop()
{
  unsigned int d;
  moveForward();
  d = readDistance();
  Serial.println(d, DEC);
  if (d < 700)
  {
    moveBackward();
    delay(500);
    turnLeft();
    delay(200);
  }
}
void moveForward()
{
  analogWrite(LEFT_SPEED, NORMAL_SPEED);
  digitalWrite(LEFT_BACKWARD, LOW);
  digitalWrite(LEFT_FORWARD, HIGH);
  analogWrite(RIGHT_SPEED, NORMAL_SPEED);
  digitalWrite(RIGHT_BACKWARD, LOW);
  digitalWrite(RIGHT_FORWARD, HIGH);
}
void moveBackward()
{
  analogWrite(LEFT_SPEED, NORMAL_SPEED);
  digitalWrite(LEFT_BACKWARD, HIGH);
  digitalWrite(LEFT_FORWARD, LOW);
  analogWrite(RIGHT_SPEED, NORMAL_SPEED);
  digitalWrite(RIGHT_BACKWARD, HIGH);
  digitalWrite(RIGHT_FORWARD, LOW);
}
void turnLeft()
{
  analogWrite(LEFT_SPEED, NORMAL_SPEED);
  digitalWrite(LEFT_BACKWARD, HIGH);
  digitalWrite(LEFT_FORWARD, LOW);
  analogWrite(RIGHT_SPEED, NORMAL_SPEED);
  digitalWrite(RIGHT_BACKWARD, LOW);
  digitalWrite(RIGHT_FORWARD, HIGH);
}
void turnRight()
{
  analogWrite(LEFT_SPEED, NORMAL_SPEED);
  digitalWrite(LEFT_BACKWARD, LOW);
  digitalWrite(LEFT_FORWARD, HIGH);
  analogWrite(RIGHT_SPEED, NORMAL_SPEED);
  digitalWrite(RIGHT_BACKWARD, HIGH);
  digitalWrite(RIGHT_FORWARD, LOW);
}
void moveStop()
{
  analogWrite(LEFT_SPEED, STOP_SPEED);
  digitalWrite(LEFT_BACKWARD, LOW);
  digitalWrite(LEFT_FORWARD, LOW);
  analogWrite(RIGHT_SPEED, STOP_SPEED);
  digitalWrite(RIGHT_BACKWARD, LOW);
  digitalWrite(RIGHT_FORWARD, LOW);
}
void setupMove()
{
  pinMode(LEFT_SPEED, OUTPUT);
  pinMode(LEFT_FORWARD, OUTPUT);
  pinMode(LEFT_BACKWARD, OUTPUT);
  pinMode(RIGHT_SPEED, OUTPUT);
  pinMode(RIGHT_FORWARD, OUTPUT);
  pinMode(RIGHT_BACKWARD, OUTPUT);
  analogWrite(LEFT_SPEED, STOP_SPEED);
  digitalWrite(LEFT_FORWARD, LOW);
  digitalWrite(LEFT_BACKWARD, LOW);
  analogWrite(RIGHT_SPEED, STOP_SPEED);
  digitalWrite(RIGHT_FORWARD, LOW);
  digitalWrite(RIGHT_BACKWARD, LOW);
}
unsigned int readDistance()
{
  int duration;
  digitalWrite(ULTRASONIC_TRIG, LOW);
  delayMicroseconds(2);
  digitalWrite(ULTRASONIC_TRIG, HIGH);
  delayMicroseconds(5);
  digitalWrite(ULTRASONIC_TRIG, LOW);
  // The same pin is used to read the signal from the PING))): a HIGH
  // pulse whose duration is the time (in microseconds) from the sending
  // of the ping to the reception of its echo off of an object.
  duration = pulseIn(ULTRASONIC_ECHO, HIGH);
  return duration;
}
void  setupUltrasonic()
{
  pinMode(ULTRASONIC_TRIG, OUTPUT);
  pinMode(ULTRASONIC_ECHO, INPUT);
  digitalWrite(ULTRASONIC_TRIG, LOW);
}

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Ricky just make an update on his quest to streaming video from Android.

element14: XinCheJian GGHC: XinCheJian coming out of the depths of video streaming from Android!: “”

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