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Thursday, 12 May 2011

How FIRST Works-FIRST Lego League

Younger minds long for a good bout of competitive robot building as well, so in 1998 FIRST created the FIRST Lego League through a partnership with the Lego Group. Specifically, kids in grades four through eight build Lego robots aimed at surmounting challenges based on real-world scientific topics ranging from nanotechnology to climate change.

Each FIRST Lego League challenge features two parts: a robot game and a project. With the help of an adult coach, teams of up to 10 children program an autonomous robot to score points on a themed playing field in two minutes and 30 seconds. This is the game portion of the challenge, in which both the robots and the field itself use Lego parts.

The project portion of the challenge is based more in research and innovation. Each team develops a solution to a problem they identify, such as solving a local problem with nanotechnology. From here, teams can choose to attend an official tournament.

Geared for ages 9-14, FIRST Lego League chooses its challenge topics in order to expose young minds to potential scientific career paths and encourage good sportsmanship, teamwork, hands-on technical experience and community involvement. Lego League Teams enjoy lower costs and longer build times than traditional FIRST teams and often stem from a variety of school and nonschool programs such as 4-H, Girl Scouts, Boy Scouts, Boys and Girls Clubs, YWCA, YMCA, religious organizations and neighborhood groups.

A mere 210 teams participated in the FIRST Lego League's inaugural year in 1998, but that number has skyrocketed over the years to 14,000-plus in more than 50 countries. That's a lot of Lego bricks!

Wednesday, 11 May 2011

How FIRST Works -The Kit of Parts

Once you've formed your team, raised your funding and paid your registration fee, then it's on to the January kickoff meeting. Here, FIRST announces the challenge for the year, releases manuals and ships out the infamous kit of parts.

Each team gets the same kit, composed of the various technological bits and pieces that will become a team's robot: motors, sensors, shafts, bearings, a radio receiver, a battery power pack, a multichannel radio control system and various control system essentials.

Teams also are allowed to purchase certain approved extra items. With these parts, a team can begin the design process. Here, students have the chance to be as creative and innovative as possible, provided the robot contains three basic elements:

1. A set of wheels that can move it around on the field of play. Hey, you're not going to win just standing there, right?

2. A frame to hold all the motors, wheels, batteries and additional parts together. Work that robot into shape!

3. Arms or movers to carry out game activities.

Let's explore that last requirement a tad closer. Some FIRST challenges require the robot to gather balls and move them toward the end of the field. How might a robot design handle this? It might throw the balls with arms, shoot them down conveyer belts or hit them with a paddle. As long as the robot has a means of carrying out required tasks, it's good to go.

Time flies in FIRST. As you might remember, teams typically have about six weeks to turn a kit of parts into a working robot. The American Society of Mechanical Engineers (ASME) publishes a very useful guide that recommends the following plan for the six-week construction cycle:

Week 1: Design the robot.

Week 2: Design and prototype the robot's subsystems.

Weeks 3 and 4: Build the subsystems.

Week 5: Integrate the subsystems to build the robot.

Week 6: Test and practice.

Even assuming the team doesn't make a serious mistake, this is an extremely intense schedule. But it's also one of the things that makes FIRST such a challenging and rewarding experience.

Tuesday, 10 May 2011

How FIRST Works-Forming a Team

Students have a lot to gain from robotics programs like FIRST. They work with professional engineers, develop team-building skills and get their hands dirty with some actual robotic construction, programming and problem solving -- all while potentially having the time of their lives. (Did we mention that teams may travel to other cities for competitions without Mom and Dad necessarily in tow?)

But in order for all this to happen, these adventure-bound young men and women either have to find a FIRST team or build one from scratch. Here's what every new FIRST team needs:

Two or three professional engineers: These volunteers play an essential role in any FIRST robotics team. They use their technical expertise to guide students through all the engineering, design and construction challenges involved in the construction of a competitive robot.

Two or three additional adults: There's more to FIRST than nuts, bolts and circuit boards, so you'll need additional volunteers to handle all the nontechnical demands. This means organizing and communicating with FIRST itself, registering for events, fundraising, shipping and making travel arrangements. Established FIRST teams often depend on additional volunteers for everything from Web design to bookkeeping.

Financial sponsors: FIRST teams have to leverage thousands of dollars to compete. The 2010 registration fee (which covered parts and participation in one event) was $6,500 for rookie teams and $5,000 for veteran teams who reused parts from previous events. Teams could then register for additional events at a price of $4,000 each. This is where all the volunteer work comes in handy. FIRST recommends raising between $15,000 and $30,000 in order to participate in two to three regional competitions through corporate donations and school fund-raising efforts.

Space, tools and time: Yes, teams will need the time, tools and space to design, build, program and test a working robot. This means access to a machine shop, secure storage space and enough room to safely practice. You'll also need hand tools, power tools and machine tools. As far as time goes, FIRST recommends that teams meet several times a week from mid-December to the end of April. Some of the more experienced teams meet year-round and compete in offseason events.

Fifteen to 25 high-school-aged students: Finally, remember the old adage, "the more the merrier." More students means more opportunities for your FIRST team, so open the doors to anyone supported by the school principal and parent volunteers.

Monday, 9 May 2011

How FIRST Works-FIRST Basics

The FIRST Robotics Competition stands at the heart of the entire organization. Here, specially designed robots compete against each other in short games such as Lunacy, a kind of robots-only basketball for the circuit board set. Each robot, of course, is just the tip of the iceberg. A team of high school students, along with a handful of mentoring engineers and teachers, constructs each machine, and the students themselves program and remotely control the robots during play.

It all begins each fall, when FIRST teams form and work toward the annual FIRST Robotics Competition kickoff in early January. This signals the beginning of the six-week build season, as teams work toward participation in FIRST Robotics Competition regional events, typically involving a 40-to-70-team throwdown at a university arena. The winners advance to a championship event to finish the season.

Fans, judges and referees oversee each competition, but the playing fields themselves are restricted during competition: no humans allowed. It's more than just a point game, however, as the judges evaluate teams and hand out awards for design, technology, sportsmanship and commitment to FIRST. In fact, the highest honor, The Chairman's Award, singles out the team that exemplifies the values of FIRST.

Since 1992, the FIRST Robotics Competition has grown from 28 teams to more than 2,200 projected for 2011.

Sunday, 8 May 2011

How FIRST Works- Introduction

In case you haven't noticed, the robots have already taken over. No longer confined to industrial assembly lines, they assist human surgeons, patrol hostile skies and even drive around town. They grow up so fast, don't they?

The robotics field continues to worm its way into every aspect of our lives, but these advancements aren't self-sustaining. The fields of robotics, engineering and science depend on a steady pipeline of young minds.

This is where the FIRST organization comes in: For Inspiration and Recognition of Science and Technology. Founded in 1989 by famed inventor Dean Kamen, the not-for-profit program aims to mold young people into the science and technology leaders of tomorrow.
FIRST Robotics
Image courtesy FIRST Robotics
Robots take to the playing field

It's also a lot of fun because, hey, FIRST ultimately boils down to a kind of do-it-yourself robot Olympics. In the organization's own words, it's a "varsity sport for the mind." High school-aged young people from around the world form teams with like-minded cohorts, learn from adult mentors and then build the best robots they can for good-natured, character-building competition.

In this article, we'll take a good look at the basics behind FIRST, how a team rises to the top and what goes on at the national championships.

Saturday, 7 May 2011

Robots and Artificial Intelligence

Artificial intelligence (AI) is arguably the most exciting field in robotics. It's certainly the most controversial: Everybody agrees that a robot can work in an assembly line, but there's no consensus on whether a robot can ever be intelligent.

Like the term "robot" itself, artificial intelligence is hard to define. Ultimate AI would be a recreation of the human thought process -- a man-made machine with our intellectual abilities. This would include the ability to learn just about anything, the ability to reason, the ability to use language and the ability to formulate original ideas. Roboticists are nowhere near achieving this level of artificial intelligence, but they have made a lot of progress with more limited AI. Today's AI machines can replicate some specific elements of intellectual ability.

Computers can already solve problems in limited realms. The basic idea of AI problem-solving is very simple, though its execution is complicated. First, the AI robot or computer gathers facts about a situation through sensors or human input. The computer compares this information to stored data and decides what the information signifies. The computer runs through various possible actions and predicts which action will be most successful based on the collected information. Of course, the computer can only solve problems it's programmed to solve -- it doesn't have any generalized analytical ability. Chess computers are one example of this sort of machine.

Some modern robots also have the ability to learn in a limited capacity. Learning robots recognize if a certain action (moving its legs in a certain way, for instance) achieved a desired result (navigating an obstacle). The robot stores this information and attempts the successful action the next time it encounters the same situation. Again, modern computers can only do this in very limited situations. They can't absorb any sort of information like a human can. Some robots can learn by mimicking human actions. In Japan, roboticists have taught a robot to dance by demonstrating the moves themselves.

Some robots can interact socially. Kismet, a robot at M.I.T's Artificial Intelligence Lab, recognizes human body language and voice inflection and responds appropriately. Kismet's creators are interested in how humans and babies interact, based only on tone of speech and visual cue. This low-level interaction could be the foundation of a human-like learning system.

Kismet and other humanoid robots at the M.I.T. AI Lab operate using an unconventional control structure. Instead of directing every action using a central computer, the robots control lower-level actions with lower-level computers. The program's director, Rodney Brooks, believes this is a more accurate model of human intelligence. We do most things automatically; we don't decide to do them at the highest level of consciousness.

The real challenge of AI is to understand how natural intelligence works. Developing AI isn't like building an artificial heart -- scientists don't have a simple, concrete model to work from. We do know that the brain contains billions and billions of neurons, and that we think and learn by establishing electrical connections between different neurons. But we don't know exactly how all of these connections add up to higher reasoning, or even low-level operations. The complex circuitry seems incomprehensible.

Because of this, AI research is largely theoretical. Scientists hypothesize on how and why we learn and think, and they experiment with their ideas using robots. Brooks and his team focus on humanoid robots because they feel that being able to experience the world like a human is essential to developing human-like intelligence. It also makes it easier for people to interact with the robots, which potentially makes it easier for the robot to learn.

Just as physical robotic design is a handy tool for understanding animal and human anatomy, AI research is useful for understanding how natural intelligence works. For some roboticists, this insight is the ultimate goal of designing robots. Others envision a world where we live side by side with intelligent machines and use a variety of lesser robots for manual labor, health care and communication. A number of robotics experts predict that robotic evolution will ultimately turn us into cyborgs -- humans integrated with machines. Conceivably, people in the future could load their minds into a sturdy robot and live for thousands of years!

In any case, robots will certainly play a larger role in our daily lives in the future. In the coming decades, robots will gradually move out of the industrial and scientific worlds and into daily life, in the same way that computers spread to the home in the 1980s.

The best way to understand robots is to look at specific designs. The links on the next page will show you a variety of robot projects around the world.

Friday, 6 May 2011

Homebrew Robots

In the last couple of sections, we looked at the most prominent fields in the world of robots -- industry robotics and research robotics. Professionals in these fields have made most of the major advancements in robotics over the years, but they aren't the only ones making robots. For decades, a small but passionate band of hobbyists has been creating robots in garages and basements all over the world.

Homebrew robotics is a rapidly expanding subculture with a sizable Web presence. Amateur roboticists cobble together their creations using commercial robot kits, mail order components, toys and even old VCRs.

Homebrew robots are as varied as professional robots. Some weekend roboticists tinker with elaborate walking machines, some design their own service bots and others create competitive robots. The most familiar competitive robots are remote control fighters like you might see on "BattleBots." These machines aren't considered "true robots" because they don't have reprogrammable computer brains. They're basically souped-up remote control cars.

More advanced competitive robots are controlled by computer. Soccer robots, for example, play miniaturized soccer with no human input at all. A standard soccer bot team includes several individual robots that communicate with a central computer. The computer "sees" the entire soccer field with a video camera and picks out its own team members, the opponent's members, the ball and the goal based on their color. The computer processes this information at every second and decides how to direct its own team.

Check out the official RoboCup Web site for more information on Soccer robots, and Google > Computers > Robotics > Competitions for information on other robot competitions. Google > Computers > Robotics > Building will give you more information on building your own robots.

Adaptable and Universal
The personal computer revolution has been marked by extraordinary adaptability. Standardized hardware and programming languages let computer engineers and amateur programmers mold computers to their own particular purposes. Computer components are sort of like art supplies -- they have an infinite number of uses.

Most robots to date have been more like kitchen appliances. Roboticists build them from the ground up for a fairly specific purpose. They don't adapt well to radically new applications.

This situation may be changing. A company called Evolution Robotics is pioneering the world of adaptable robotics hardware and software. The company hopes to carve out a niche for itself with easy-to-use "robot developer kits."

The kits come with an open software platform tailored to a range of common robotic functions. For example, roboticists can easily give their creations the ability to follow a target, listen to voice commands and maneuver around obstacles. None of these capabilities are revolutionary from a technology standpoint, but it's unusual that you would find them in one simple package.

The kits also come with common robotics hardware that connects easily with the software. The standard kit comes with infrared sensors, motors, a microphone and a video camera. Roboticists put all these pieces together with a souped-up erector set -- a collection of aluminum body pieces and sturdy wheels.

These kits aren't your run-of-the-mill construction sets, of course. At upwards of $700, they're not cheap toys. But they are a big step toward a new sort of robotics. In the near future, creating a new robot to clean your house or take care of your pets while you're away might be as simple as writing a BASIC program to balance your checkbook.

Thursday, 5 May 2011

Autonomous Robots

Autonomous robots can act on their own, independent of any controller. The basic idea is to program the robot to respond a certain way to outside stimuli. The very simple bump-and-go robot is a good illustration of how this works.

This sort of robot has a bumper sensor to detect obstacles. When you turn the robot on, it zips along in a straight line. When it finally hits an obstacle, the impact pushes in its bumper sensor. The robot's programming tells it to back up, turn to the right and move forward again, in response to every bump. In this way, the robot changes direction any time it encounters an obstacle.

Advanced robots use more elaborate versions of this same idea. Roboticists create new programs and sensor systems to make robots smarter and more perceptive. Today, robots can effectively navigate a variety of environments.

Simpler mobile robots use infrared or ultrasound sensors to see obstacles. These sensors work the same way as animal echolocation: The robot sends out a sound signal or a beam of infrared light and detects the signal's reflection. The robot locates the distance to obstacles based on how long it takes the signal to bounce back.

Photo courtesy NASA
The autonomous Urbie is designed for various urban operations,
including military reconnaissance
and rescue operations.

More advanced robots use stereo vision to see the world around them. Two cameras give these robots depth perception, and image-recognition software gives them the ability to locate and classify various objects. Robots might also use microphones and smell sensors to analyze the world around them.

Some autonomous robots can only work in a familiar, constrained environment. Lawn-mowing robots, for example, depend on buried border markers to define the limits of their yard. An office-cleaning robot might need a map of the building in order to maneuver from point to point.

More advanced robots can analyze and adapt to unfamiliar environments, even to areas with rough terrain. These robots may associate certain terrain patterns with certain actions. A rover robot, for example, might construct a map of the land in front of it based on its visual sensors. If the map shows a very bumpy terrain pattern, the robot knows to travel another way. This sort of system is very useful for exploratory robots that operate on other planets.

An alternative robot design takes a less structured approach -- randomness. When this type of robot gets stuck, it moves its appendages every which way until something works. Force sensors work very closely with the actuators, instead of the computer directing everything based on a program. This is something like an ant trying to get over an obstacle -- it doesn't seem to make a decision when it needs to get over an obstacle, it just keeps trying things until it gets over it.

.............................................Urbie's view..................................

Wednesday, 4 May 2011

Mobile Robots

Robotic arms are relatively easy to build and program because they only operate within a confined area. Things get a bit trickier when you send a robot out into the world.

NASA's FIDO rover
Photo courtesy NASA
NASA's FIDO Rover is designed for exploration on Mars.

The first obstacle is to give the robot a working locomotion system. If the robot will only need to move over smooth ground, wheels or tracks are the best option. Wheels and tracks can also work on rougher terrain if they are big enough. But robot designers often look to legs instead, because they are more adaptable. Building legged robots also helps researchers understand natural locomotion -- it's a useful exercise in biological research.

Fujitsu's HOAP-1 robot
Photo courtesy Fujitsu and K&D Technology, Inc.
Fujitsu's HOAP-1 robot

Typically, hydraulic or pneumatic pistons move robot legs back and forth. The pistons attach to different leg segments just like muscles attach to different bones. It's a real trick getting all these pistons to work together properly. As a baby, your brain had to figure out exactly the right combination of muscle contractions to walk upright without falling over. Similarly, a robot designer has to figure out the right combination of piston movements involved in walking and program this information into the robot's computer. Many mobile robots have a built-in balance system (a collection of gyroscopes, for example) that tells the computer when it needs to correct its movements.

NASA's Frogbot
Photo courtesy NASA
NASA's Frogbot uses springs, linkages and motors to hop from place to place.

Tuesday, 3 May 2011

The Robotic Arm

      The term robot comes from the Czech word robota, generally translated as "forced labor." This describes the majority of robots fairly well. Most robots in the world are designed for heavy, repetitive manufacturing work. They handle tasks that are difficult, dangerous or boring to human beings.

      The most common manufacturing robot is the robotic arm. A typical robotic arm is made up of seven metal segments, joined by six joints. The computer controls the robot by rotating individual step motors connected to each joint (some larger arms use hydraulics or pneumatics). Unlike ordinary motors, step motors move in exact increments (check out Anaheim Automation to find out how). This allows the computer to move the arm very precisely, repeating exactly the same movement over and over again. The robot uses motion sensors to make sure it moves just the right amount.
An industrial robot with six joints closely resembles a human arm -- it has the equivalent of a shoulder, an elbow and a wrist. Typically, the shoulder is mounted to a stationary base structure rather than to a movable body. This type of robot has six degrees of freedom, meaning it can pivot in six different ways. A human arm, by comparison, has seven degrees of freedom.

The robotic arm is one of the key developments in industrial robotics. Learn about the robotic arm, its technology and how robotic arms serve heavy industry.

                            Robotic arms are an essential part of car manufacturing.                    

     Your arm's job is to move your hand from place to place. Similarly, the robotic arm's job is to move an end effector from place to place. You can outfit robotic arms with all sorts of end effectors, which are suited to a particular application. One common end effector is a simplified version of the hand, which can grasp and carry different objects. Robotic hands often have built-in pressure sensors that tell the computer how hard the robot is gripping a particular object. This keeps the robot from dropping or breaking whatever it's carrying. Other end effectors include blowtorches, drills and spray painters.    

      Industrial robots are designed to do exactly the same thing, in a controlled environment, over and over again. For example, a robot might twist the caps onto peanut butter jars coming down an assembly line. To teach a robot how to do its job, the programmer guides the arm through the motions using a handheld controller. The robot stores the exact sequence of movements in its memory, and does it again and again every time a new unit comes down the assembly line.

     Most industrial robots work in auto assembly lines, putting cars together. Robots can do a lot of this work more efficiently than human beings because they are so precise. They always drill in the exactly the same place, and they always tighten bolts with the same amount of force, no matter how many hours they've been working. Manufacturing robots are also very important in the computer industry. It takes an incredibly precise hand to put together a tiny microchip.

Monday, 2 May 2011

Robot Basics

Robot basics include movable components, metal or plastic joints, motors and hydraulic systems. Learn about robot basics and parts found in robots.
Photo courtesy NASA
A robotic hand, developed by NASA, is made up of metal segments moved by tiny motors. The hand is one of the most difficult structures to replicate in robotics.

     The vast majority of robots do have several qualities in common. First of all, almost all robots have a movable body. Some only have motorized wheels, and others have dozens of movable segments, typically made of metal or plastic. Like the bones in your body, the individual segments are connected together with joints.

     Robots spin wheels and pivot jointed segments with some sort of actuator. Some robots use electric motors and solenoids as actuators; some use a hydraulic system; and some use a pneumatic system (a system driven by compressed gases). Robots may use all these actuator types.
A robot needs a power source to drive these actuators. Most robots either have a battery or they plug into the wall. Hydraulic robots also need a pump to pressurize the hydraulic fluid, and pneumatic robots need an air compressor or compressed air tanks.
The actuators are all wired to an electrical circuit. The circuit powers electrical motors and solenoids directly, and it activates the hydraulic system by manipulating electrical valves. The valves determine the pressurized fluid's path through the machine. To move a hydraulic leg, for example, the robot's controller would open the valve leading from the fluid pump to a piston cylinder attached to that leg. The pressurized fluid would extend the piston, swiveling the leg forward. Typically, in order to move their segments in two directions, robots use pistons that can push both ways.

     The robot's computer controls everything attached to the circuit. To move the robot, the computer switches on all the necessary motors and valves. Most robots are reprogrammable -- to change the robot's behavior, you simply write a new program to its computer.
Not all robots have sensory systems, and few have the ability to see, hear, smell or taste. The most common robotic sense is the sense of movement -- the robot's ability to monitor its own motion. A standard
design uses slotted wheels attached to the robot's joints. An LED on one side of the wheel shines a beam of light through the slots to a light sensor on the other side of the wheel. When the robot moves a particular joint, the slotted wheel turns. The slots break the light beam as the wheel spins. The light sensor reads the pattern of the flashing light and transmits the data to the computer. The computer can tell exactly how far the joint has swiveled based on this pattern. This is the same basic system used in computer mice.

      These are the basic nuts and bolts of robotics. Roboticists can combine these elements in an infinite number of ways to create robots of unlimited complexity. In the next section, we'll look at one of the most popular designs, the robotic arm.

Sunday, 1 May 2011

How Robots Work

On the most basic level, human beings are made up of five major components:
  • A body structure 
  • A muscle system to move the body structure
  • A sensory system that receives information about the body and the surrounding environment 
  • A power source to activate the muscles and sensors 
  • A brain system that processes sensory information and tells the muscles what to do
         Of course, we also have some intangible attributes, such as intelligence and morality, but on the sheer physical level, the list above about covers it.

A robot is made up of the very same components. A typical robot has a movable physical structure, a motor of some sort, a sensor system, a power supply and a computer "brain" that controls all of these elements. Essentially, robots are man-made versions of animal life -- they are machines that replicate human and animal behavior.

Introduction - Robots

           Ever since the Czech writer Karel ├łapek first coined the term "robot" in 1921,

there has been an expectation that robots would some day deliver us from the drudgery

of hard work. The word - from the Czech,"robota", for hard labour and servitude -

described intelligent machines used as slaves in his play R.U.R. (Rossum's Universal


          Today, over one million household robots, and a further 1.1 million industrial

robots, are operating worldwide. Robots are used to perform tasks that require great

levels of precision or are simply repetitive and boring. Many also do jobs that are
hazardous to people, such as exploring shipwrecks, helping out afterdisasters

studying other planets and defusing bombs or mines. Robots are increasingly marching 

into our lives. In the future, robots will act as carers, medics, bionic,enhancements,

companions, entertainers, security guards, traffic police and even soldiers.