Caution Tape Robotics Presents: Moon Walker - 839A Reveal

Presenting the latest edition of our World Record Holding IQ Robot - Moon Walker.

Our current official scores are
Programming - 141
Driver - 210
Enjoy the reveal!

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Sweet bot. What’s the black string that lifts the lower claw? Are they rubber bands?

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Its a special hexbug kit :wink:

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Well that was the best VEX IQ reveal video I’ve ever seen.

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I don’t know much about IQ robots, but the presentation is great. Good reveal song too.

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Powerful‎‎‎‎‎‎‎‎‎‎‎‎‎

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I can’t be totally sure what rope piece it is, but if I had to guess it would be from the new Construction Zone kit. The colors certainly fit Caution Tape’s aesthetic.

I can’t tell if its two 228-2500-440 (36x pitch rope) or one looped 228-2500-448 (120x pitch rope).
I personally hope it’s one long 120x pitch rope snaked between the arm and the lower claw, that would be rad.

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It is actually from a kit from a couple years ago if i recall, but I am guessing these parts are identical!

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What are you using to code to drive in the smooth arc in auto? What grade level are the students doing this?

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That is the best VEX Iq reveal I have ever seen, amazing work and really nice bot

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839A is a middle school team. They are grade 6 & 7, but all are 11 years old.

They use PID tuning and gyro for their turns and corrections.

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Top-notch quality‎‎‎‎‎

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What’s the ratio of the drivetrain?

TBH, coach doesn’t even know that. Kids built the bot themselves, coach only provided feedback based on the issues we observe. We let them figure out the solution themselves.

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Would you guys be willing to share some of the PID code? If not I understand. We’re a new team and our autonomous wasn’t accurate and this was the solution we found. However, we have no idea how to code PID. Is the gyro sensor the only one used in it or is the distance sensor also important? Thank you

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Hey there, thanks for reaching out!

You’re on the right track to solving your issues by learning how to create an accurate autonomous, unfortunately IQ doesn’t have the luxury of accurate sensors. Gyro is your best bet and using light sensors to line track is another option. A full PID code isn’t typically needed for IQ, we almost never use Kd, only Kp and Ki. Our students are planning on creating a series of helpful videos soon, but for now i would look at drive straight and accurate turn functions, that use only Kp.

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BTW, are you using vexcode with scratch?

So did you use a PI-loop for turning with the gyro sensor and the speed of the drive wheels? And how did you use it for driving straight?

Whether using PI-loop or regular gyro turns is completely up to you, but we use gyro for turning, and motor encoders for driving straight. We also use gyro for maintaining heading while traveling a straight line.

We are happy to help explain the logic, but obviously hope that you guys can test and solve these for yourselves, with these key points :slight_smile:

A good place to start would be a simple Kp for turns and motor encoders for drive straight.

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Thanks for helping out! I think I speak for everyone on the forum when I say we appreciate you helpfulness and kindness.

I noticed that your team’s bot tipped a little bit, did this along with the fast drivetrain cause any inconsistencies for programming?

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