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Student POV: Slalom Challenge

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It’s Danica and Jake, back again! This time, teaching people about the slalom challenge, in ROBOTC Graphical Language for the VEX IQ platform. The challenge is to line follow using the VEX IQ color sensor without hitting the “mines”, also known as the cups.

#5

In the graphical organizer, to line follow on the left side of the line, all you have to do is use the block, lineTrackLeft, to follow the right side you have to use lineTrackRight.

#1

In this block, there are 3 boxes, one for the threshold, the second for the speed of the left motor, and the last box is for the speed of the right motor. In this line of code, the threshold of 105, the robot’s left motor is set to go at 50% power, and the right motor is set to go at 15% power.

This block has to be included into a repeat loop to make sure the robot continues to do this command for an allotted amount of time.

#2

The repeatUntil loop has many options for how long the loop should run. For this challenge, we decided to use the timer.

#3

The timer is set at 7000 milliseconds or 7 seconds, so it has enough time to make it through the slalom. Our finished program looks like this:

#4

Now you can line follow in any challenge you would like, the possibilities are endless!

Written by Cara Friez

April 2nd, 2014 at 7:47 am

Student POV: Robo 500 Challenge

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Hi, we’re Alexis and Noah, two eighth grade students at Hopewell Memorial Junior High School. Earlier this week, we did the Robo 500 challenge. To write the programs, we used the recently released ROBOTC Graphical software for the VEX IQ. The goal of the challenge was to complete two laps around a Vex IQ storage bin.

ROBO 500 picture

We completed the challenge by using timing and degree measurements. The first step was to get the robot to move forward. For this, we would use a basic motor command.

Photo 1

In ROBOTC Graphical, it gives you the option to choose the values in which you want your motor to run by, such as time and rotations. In this challenge, we chose time.

Photo 2

From there, we experimented with different time values until we found the timing that was needed to finish the side of the challenge before the turn. Through testing, I found that 3.7 seconds covered the distance needed.

Photo 3

Now, what was left was the largest challenge of the program, the turn. Timing a turn can be challenging on seconds alone. So, I used degree turns. I started with a 180 degree, which brought me around about 45°. Due to the drift of the robot when it moves forward, I had to make the turn slightly less than double the 180° turn. I settled on a value of 300°.

Photo 4

Once the values were established, the rest was just repeating the commands so the robot would go around the whole box. Here is an example of my final program.

Photo 5

We were then thinking about how the turns were a hassle with trial and error, and contemplated a better way to turn. So, we decided to use a gyro sensor to have the most accurate turns possible.

To start out the program we had to reset the gyro sensor so the sensor could record the degrees from zero.

Photo 6

From here we moved forward to the end of the course for time, and we moved forward for about four seconds. Then we used a while loop. A while loop is set to check a condition and while the condition is true, it performs what is inside of the curly braces of the while loop. In this case the condition is while the gyro sensor value is less than 90 degrees.

Photo 7

We would then repeat these actions until the robot has made two full laps around the course. Here is the program for one lap. To do two laps I would just repeat this program again.

Photo 8

We were able to finish our programs efficiently in a short amount of time due to the design of the new graphical programming. This new design enables you to drag over commands from the function library; such as, moving forwards and backwards, turning, and sensor commands while avoiding the hassle of painstakingly typing each command. This reduces the time spent on each program and allows us to speed up the pace at which we program, and we are able to complete challenges in a shorter amount of time.

Photo 9To the left, we have an image of the function library and a depiction of what would happen if you dragged a command into your program. The command would line up with the next available open line and would give you options as to what values you wanted to program your robot with.

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If you’re a student who would like to contribute to the blog, let us know at socialmedia@robotc.net.

Written by Cara Friez

March 26th, 2014 at 7:30 am

Student POV: Labyrinth Challenge

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We are really excited to introduce a new blog series called Student POV! This series will feature students giving their perspective and advice for programming in ROBOTC. If you’re a student who would like to contribute to the blog, let us know at socialmedia@robotc.net. Welcome our first student bloggers, Danica and Jake!

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Hi it’s Danica and Jake, and we just completed the Labyrinth Challenge. We are both 8th grade students attending Hopewell Memorial Junior High. We both used VEX IQ Graphical Programming Language to complete this challenge since it is a new software recently released by ROBOTC. The first challenge we had to accomplish was the labyrinth challenge. The labyrinth is a square, where the robot has to travel from the starting point, to the ending point by doing a series of basic commands.

#1

Our first task was to make our robot move forward.

#2

This block is telling the robot to go forward at 50% power for 5 rotations, but you can also set the robot to move for degrees, milliseconds, seconds, and minutes.

Our second task was to make the robot turn left.

#3

When turning left, you can use multiple commands such as degrees, rotations, milliseconds, seconds, and minutes. You can also use this for turning right.

One problem while programming for this challenge was making 90 degree turns. To get a perfect 90 degree turn, with timing, you had to go through a lot of trial and error. After figuring out the perfect turns, based on timing, the time for moving forward, and the stops to prevent drifts, we had to string all the commands together to form the program for the challenge. This what the finished program looks like:

#4

An easier way to perform more accurate turns, is with the use of the gyro sensor. The gyro sensor allows you to count how many degrees you turn. This simply means that you can actually tell the robot to make an accurate turn. You also have to remember to reset the gyro after every use, and it will make this program a lot easier.

To reset the gyro you have to use this block:

#5

The finished program with the gyro sensor looks like this:

#6

In this program we used the setMotor command instead of turnLeft or turnRight. This command is better to use in the while loop since you only have to set the speed of the motor. The condition in the while loop determines how long the robot turns. As a result, we just need to set the motor speed with the setMotor command.

A cool feature you can use in RobotC is commenting out your code. You can also do this in the VEX IQ Graphical Organizer. It is much easier though since you only have to click the number on the block of code you want to comment out.

Commenting looks like this:

#7

These comments allow you to test only one turn out of the whole code, which is very useful during the trial and error stage.
Now it is time to go try the Labyrinth challenge on your own, either with or without the gyro sensor. Have fun!

Written by Cara Friez

March 19th, 2014 at 4:29 pm

ROBOTC Graphical Programming Preview Available!

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clickanddragAfter months of work, the ROBOTC Development Team is excited to announce the availability of the first preview release of ROBOTC Graphical Language for the VEX IQ platform. This new interface will allow you to program robots from inside ROBOTC with easy-to-use graphical blocks that can be drag-and-dropped to form a program. Each block represents an individual command from the “text-based” ROBOTC and Natural Language. The new click and drag interface along with the simplified commands of Natural Language will allow any robotics user to get up and running with programming their robots as soon as possible.

The first release of ROBOTC Graphical Language is available for the VEX IQ platform for use with the standard VEX IQ Clawbot and Autopilot Robots. All ROBOTC 4.0 users will receive access to the new Graphical Language interface at no additional cost! Our plans over the next few months are to extend the Graphical Language interface to all of ROBOTC’s support platforms, including the Robot Virtual Worlds technology. You can download the preview version today at http://www.robotc.net/graphical/.

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The new ROBOTC Graphical programming environment adds a number of new features we’d like to highlight:

Graphical Language Command List (Drag and Drop)

GraphicalFunctionBar
With the new ROBOTC Graphical Mode, we’ve updated our “Functions Library” to match the style of the Graphical interface. This new mode will allow you to drag and drop blocks of code from the “Graphical Functions” menu into your program to get your program created even faster!

New Language Commands for Easier Programs

NewLanguageCommands
We also added some new language extensions to both ROBOTC and Natural Language; such as the simplistic “Repeat” command. Prior to the Repeat command, users would need to copy and paste large sections of code or use a looping structure (like a ‘for’ or ‘while’ loop) in order to have a set of actions repeat a number of times. With the new “Repeat” command, however, users can simply specify how many times they would like the code to run, with no complex coding required. And users who wish to make an “infinite loop” can use the “repeat forever” command to accomplish this task quickly!

Commenting Blocks of Code!

CommentingOut
Another awesome tool that we’ve implemented in ROBOTC Graphical is the “comment out” feature. You can now comment out an entire line of code just by clicking on the block’s line number. The robot ignores lines of code that are “commented out” when the program runs, which makes this feature very useful when testing or debugging code. This new tool is unique to ROBOTC’s Graphical interface.

Updated and Simplified Toolbar

Toolbar
Sometimes navigating menus as a new user can be a little overwhelming – so many options to choose from and lots of questions about what each option is used for. To help with this, we’ve redesigned ROBOTC’s toolbar to make getting up and running easier. We put the most used commands on a larger toolbar so new users have an area to easily click to download firmware, send their code to their robot, and run their programs without having to use the standard menu interface.

Convert to Text-Based Natural Language

ConvertToText ConvertToText2
Because each Graphical Natural Language block corresponds to a real ROBOTC or Natural Language function, users will be able to graduate from Graphical Programming to full text-based programming with the press of a single button. This allows users to naturally transition from Graphical Natural Language to the text based Natural Language (or ROBOTC), without having to worry about manually converting the code line-by-line!

Teacher’s Guide and Sample Programs

UsersGuide
The new graphical interface includes over 50 new sample programs to help you get up and running with working examples and demo code. In addition, we’ve also developed a 30+page guide to walk new (and existing) users through the new Graphical Programming interface and getting started with the VEX IQ platform. You can find a link to the programming guide here and also on the ROBOTC Graphical page.

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This initial release is only the beginning and we’re planning on improving the software with more features and flexibility over the coming months.

Future Support/Features:

  • Copy and Paste
  • Undo/Redo Support
  • Support for custom robots/configurations via an updated “Motors and Sensor Setup” interface.
  • Dynamic Loop and Command Parameters (based on Motors and Sensor Setup / Robot Configuration)
  • Tooltips, Contextual Help, and more!

Click here to download the installer!

Let us know what you think! If you have any feedback or questions, please send them along via the ROBOTC’s VEX IQ forums.

A Teacher’s POV: Fun With VEX IQ Remote Controls

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Whether they are in elementary school, middle school, or high school, students really enjoy programming their robots with remote controls. Luckily, the VEX IQ wireless controller allows you to do just that. ROBOTC allows you to create your own remote control programs to customize each joystick axis and button controls. Moreover, you can use both Natural Language and full ROBOTC with the remote controls.

Both the VEX IQ brain and the remote control require a radio controller for communication. The radio controller has to be in each in order to use the remote control. Additionally, a battery needs to be placed into the remote control for the wireless communication. Just like the battery for the VEX IQ brain, the battery for the remote control is rechargeable.

Vex Remote 1In order for the VEX IQ brain and the controller to communicate, they must be paired together. With both devices turned off, connect the two devices together with the tether cable that is included with the VEX IQ Starter Kit with Controller. The tether cable is just a standard Ethernet cable. Turn on the VEX IQ brain by pressing the check button. The controller will automatically link and pair with the VEX IQ brain.

Once your connection has been established, the green light will blink on both the remote control and the VEX IQ brain. You will not have to link the tether cable with the remote control the next time you turn on the VEX IQ brain or the remote control. In the classroom, you can assign each robot to a remote control by giving each a number. That way, you never have to link the remote control with the VEX IQ brain. Or, you can just have the students do a quick set up at the beginning of class. Either way will work.

ROBOTC can access all of the data from the VEX IQ remote control by referencing the button and axes by their described names. Joystick buttons return values of..

• 1 – Pressed
• 0 – Not Pressed/Released

Joystick Axis return values of…
• -100 to +100 (0 when centered)

Vex Remote 2 Vex Remote 3

When using the VEX IQ remote control, make sure you switch to your “Controller Mode” to Tele-Op.

Vex Remote 4

Alright, now you can begin programming (either in Natural Language or full ROBOTC) and have some fun.

Remote controlAs teachers, we all know to expect the unexpected. I recently had the students on a Friday, with a long weekend in front of them. Therefore, I did not want to start a new concept, for I would have to re-teach it after the long weekend. So, I decided to set up a quick in-class competition with the VEX IQ Challenge Field and some Bucky Balls and rings.

I allowed the students to make up the parameters for the game, gave them some time to devise some strategy, downloaded some sample programs to run the remote controls, and let the fun begin. The students had a great time and the activity will serve as a springboard for future investigation into how to customize the remote control programs.

- Jason McKenna

Written by Cara Friez

February 4th, 2014 at 9:55 am

February Online Professional Development Courses

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February TrainingsThe Carnegie Mellon Robotics Academy will be offering two ROBOTC online professional development courses in February!
The  six-weeks online courses will be:

ROBOTC Online Training for LEGO / TETRIX
February 11th – March 18th, 2014
Tuesdays for 6 Weeks
7-9:00pm EST (4-6:00pm PST)

ROBOTC Online Training for VEX CORTEX
February 13th – March 20th, 2014
Thursdays for 6 Weeks
7-9:00pm EST (4-6:00pm PST)

Web Training graphicThe Professional Development courses provide teachers and coaches with a solid foundation for robot programming in the respective languages, and experience in troubleshooting common student mistakes. It also focuses on identifying and extracting academic value from the naturally occurring STEM situations encountered in robotics explorations. Find out more here – Robotics Academy Professional Development

Classes are filling up quick, so sign up today!

 

 

 

Written by Cara Friez

January 31st, 2014 at 1:03 pm

ROBOTC Graphical Natural Language

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We know that text based languages (such as ROBOTC) have advantages in terms of customizability with functions, complexity with algorithms and calculations, and typically smaller sized programs over graphical languages; however, it is difficult to overcome the simplicity and ease of use that “Drop and Drag” programming languages offer to new users just getting started with programming.

TextBasedNaturalLanguage

A few years ago (with ROBOTC 3.X), we announced our “Natural Language” feature – a simplified library of commands that used “natural” commands to control your robot, such as Forward, Reverse, and LineTrackForTime. The Natural Language feature was designed to help ‘bridge the gap’ between a graphical language and the text-based ROBOTC. Teachers have praised ROBOTC’s Natural Language for making it easier to get their students up and running faster than ever before. Currently, ROBOTC supports Natural Language on the VEX Cortex, VEX IQ, and LEGO MINDSTORMS NXT platforms for both “Real” and “Virtual” robots.

GraphicalProgrammingOverview1

Today we’re proud to give you a sneak peek to a new feature we’re calling “Graphical Natural Language”. This new interface will allow you to program robots from inside ROBOTC with easy-to-use graphical blocks that can be drag-and-dropped to form a program. Each block represents an individual command from the “text-based” ROBOTC and Natural Language.

 


 

Each block is custom designed to fit the needs for that specific function and parameters. Using text boxes and drop-down menus, users can customize each values of each function to solve various challenge and activities using the same commands as ROBOTC’s Text-Based Natural Language.

FunctionsParameters
We have also added some new language extensions to both ROBOTC and Natural Language, such as the simplistic “Repeat” command. Prior to the Repeat command, users would need to copy and paste large sections of code or use a looping structure (like a ‘for’ or ‘while loop) in order to have a set of actions repeat a certain number of times. With the new “Repeat” command, however, users can simply specify how many times they would like for the code to run, with no complex coding required.

RepeatCommand
Another awesome tool that we’ve implemented in ROBOTC 4.0 is the “comment out” feature. You can now comment out an entire line of code just by clicking on the block’s line number. Lines of code that are “commented out” are ignored by the robot when the program is run, which makes this feature very useful when testing or debugging a program. This new tool is unique to Graphical Natural Language.

CommentingOut
Because each Graphical Natural Language block corresponds to a real ROBOTC or Natural Language function, users will be able to graduate from Graphical Natural Language to full text-based Natural Language with the press of a single button. This will allow you to naturally transition from Graphical Natural Language to the text based Natural Language (or ROBOTC), without having to worry about manually converting the code line-by-line!

NaturalLanguageWithCode
We have many other features and enhancements planned for Graphical Natural Language – Be on the lookout for a preview version sometime in January!

Please Note: The screenshots and interface in this post are not the finalized version of the ROBOTC Graphical Natural Language – the names, interface, look and feel of the system may change between now and official release.

A Teacher’s POV: Programming the VEX IQ Robots

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VEX-IS-DS4In the previous entry, I shared some of the features of the VEX IQ robots. Also discussed were some ideas on how to get a classroom organized. Now that we have those things established, we can move on to a discussion of how to begin programming the VEX IQ robots.

ROBOTC for VEX IQ has Natural Language commands that will help beginning programmers of the VEX IQ by supplying a set of commands that use “natural” words. For example, the “forward” command will make your robot move forwards for a specified amount of time or distance. The robot will come to a stop after the movement. Here are some examples of the command:

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Move the robot forward for 2.5 rotations:
• forward(2.5);

Move the robot forward to 180 degrees:
• forward(180, degrees);

Move the robot forward for 1.5 rotations at 30% speed:
• forward(1.5, rotations, 30);

Move the robot forward for 10 seconds:
• forward(10, seconds);
• forward(10000, milliseconds);
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Natural Language also contains other helpful commands; such as, “backward”, “turnLeft”, “turnRight”, and “repeat”. Below is an example of a Natural Language sample program that is located within the Natural Language sample program folder in ROBOTC:
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/*
VEX IQ Natural Language – Port Names and Numbers
leftMotor – Port #1
rightMotor – Port #6
armMotor – Port #10
clawMotor – Port #11
touchLEDSensor – Port #3
gyroSensor – Port #4
distanceSensor – Port #7
bumperSensor – Port #8
colorSensor – Port #9
*/

task main()
{
//Configure the Natural Language to use the VEX IQ Clawbot
setRobotType(VexIQClawbot);

//Move the robot forward for 1.5 rotations (rotations are the default unit) at 50% speed (default speed)
forward(1.5);

//Turn the robot right for 1.25 rotations at 50% speed (default speed)
turnRight(180, degrees);

//Move the robot backwards for 720 degrees at 25% speed.
backward(720, degrees, 25);

//Turn the robot left for 2.5 rotations at 50% speed (default speed)
turnLeft(2.5, rotations);
}
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As you can see, there are a couple things that we have to do in order to use the Natural Language functionality. To enable Natural Language, go to “Robot Menu -> Platform Type -> Natural Language”.

The easiest way to get started programming is to open a sample program or to use a template. To open a sample program in ROBOTC, go to File Menu -> Open Sample Program.

To use a Natural Language template in ROBOTC, go to File Menu -> New… -> Natural Language Template.

To make programming easier, Natural Language makes assumptions about the type of robot you are using. To configure your Natural Language program to use our VEX IQ Clawbot, use the following line of code:
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setRobotType(VexIQClawbot);
More robot models will be supported in future releases.
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VEX-IQ-DSFinally, you will notice in the sample program that port names and numbers are given specific names and ports. Make sure that your VEX IQ Clawbot’s motors and sensors are configured this way in order to work with the Natural Language commands.

Ok. We are ready to go with programming! What should we do? My suggestion would be to start with the Labyrinth Challenge.

The Labyrinth challenge gives the students an opportunity to engage with the VEX IQ robots and ROBOTC. The students are immediately engaged because they can see and test their robot’s movement as it makes its way through the course. Since this may be the first program that some students write, there are a couple of things worth remembering. First, makes sure the students create a flowchart before they begin programming. For more information on flowcharts, you can look here: VEX Teacher – Engineering.

VEX-IQ-DS2Second, it is important that the students describe what is going on in their programs with comments. For more information on how to utilize comments, please see here: http://www.robotc.net/vex_full/reference/hp_comment.pdf

Now you are ready to go! Good luck and have fun! Remember, if you have any questions as you are working, please visit the ROBOTC forums.

- Jason McKenna

Written by Cara Friez

December 13th, 2013 at 6:41 am

A Teacher’s POV: Getting Started with the VEX IQ

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VEX-IQ-Carly-and-KarriThe VEX IQ robot is a great, new option for middle and high school robotics teachers. With anything new in the classroom, it’s important to have some ideas on how to best implement the new tools in the classroom.

There are some features of the VEX IQ system that teachers will notice initially. The VEX IQ brain has 12 identical ports. This means that any device (either a sensor or a motor) can be plugged into one of the ports. Also, the VEX IQ motors are smart motors; therefore, the motors can hold a position and resist external movements. Some of the sensors for the VEX IQ include a Bumper sensor, a Touch LED sensor, a Gyro Sensor, a Color sensor, and a Sonar sensor. One nice asset of the motors and sensors is the fact that they each have their own upgradeable firmware. As a result, if new features are added, the firmware for the device can be upgraded, as opposed to buying a new sensor and/or motor.

With the VEX IQ Starter Kit, there are over 850 structural and motion components. That many parts allow teachers and students lots of flexibility when it comes to building a robot. But, that’s only if they can find the parts they need. One of the first things that teachers need to do is get their kits organized. The Starter Kit comes with a storage bin and tray that help, but the amount of parts means that different pieces will need to be stored together in the storage bin. If the students know what pieces are located in each section of the storage bin, it will make the building process much easier.

VEX-IQ-JacobThe base robot for the VEX IQ is the Clawbot. The Clawbot include a gripper and a lifter arm. These features immediately grab the attention of most students; they love the idea of being able to lift and grab an object. For teachers, it is a good idea to build the Clawbot before allowing the students the opportunity to do the same. This gives teachers an idea of what problems the students may have as they begin building, and it also allows the teachers to help those students that run into problems. You can’t start anything until all the students have their robot built. Having some groups finish their robot, while other groups lag behind can be an issue. Building a robot first, puts the teacher in the best position to get everyone started off on the right foot.

When it comes time to start building, students can work on different parts of the VEX IQ Clawbot. You can divide the Clawbot into these sections: the Base, the Claw, the Tower, and the Ball Holder. One suggestion to organize a class would be to have two students work on the Base, while one student each works on the Claw, the Tower and the Ball Holder. Or, you could have one student work on each section. It’s important to note that however the class is organized for the building of the Clawbot, there should be a uniform way that the students attach the motors and sensors.

 


 

The battery for the VEX IQ robot brain comes charged, so a teacher does not need to worry about doing that preliminarily. So, once the Clawbot is built, the next thing that needs to be done is install the ROBOTC firmware and update the VEX IQ brain, motors, and any sensors that may be on the robot. Click here for directions on how to install the ROBOTC Firmware.

To update the VEX IQ brain, motors, and sensors, the VEX IQ Firmware Update Utility needs to be downloaded to your computer. The Firmware Update Utility and directions on how to utilize it can be found here.

With the next installment, we will take a look at how to set up your first programming lesson. In the meantime, teachers can take advantage of a few readily available resources at Carnegie Mellon’s Robotics Academy VEX Teacher Site and the ROBOTC Wiki to help with questions concerning programming the VEX IQ with ROBOTC.

-Jason McKenna

Written by Cara Friez

December 5th, 2013 at 4:43 pm

RVW FTC Block Party Competition Now Live!

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Block Party CS2N ModeCarnegie Mellon’s Robotics Academy, a research-based organization committed to teaching students how to program robots, is really excited to be able to support FTC teams again this year. Follow the links below to learn about FREE Programming Classes and a new Block Party Programming Game that can be used by students, teachers in classrooms, coaches, or competition providers. The new game is designed to teach programming and has over $5,000 in prizes. We’ve also made CS2N Groups Technology that enables teachers, coaches, and regional competition sponsors to host their own competitions.

In the FTC Block Party Virtual World, program one of three robots to score as many points as possible in autonomous and driver controlled modes. Score points by:

  • Placing Blocks in Floor goals
  • Placing Blocks in Pendulum goals
  • Raising the Flag
  • Hanging from the Bar

See the rules documents for the full game explanation:

  1. FTC Block Party – Autonomous CS2N Mode
  2. FTC Block Party – Remote Control CS2N Mode

 

Additional information to help you get started:

How to Setup Your Own In-Class Competition – Teachers, coaches, and competition organizers can setup their own unique programming competitions using CS2N Groups Technology.  The Robotics Academy has developed groups technology that enables teachers to setup their own in-class competitions.  To learn how to setup your own Group competition click here: http://www.cs2n.org/tutorials/competitions

Be sure to visit the CS2N.org or RobotVirtualWorlds.com for the latest version of the FTC Block Party software. Happy Programming!