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Mr. Dice Guy
Our family received Mindstorms 2.0 for Christmas, so this is our first project. My Dad and I decided to enter the Robotic Arm Challenge and design a robot that was just for fun. We wanted to build an arm that would help us play dice games. We designed and built “Mr. Dice Guy”. This robotic arm senses a dice cup when it’s placed in front of him. He then says, “object detected”, picks up the cup, shakes it several times and dumps the dice onto the table. The RGB leds change color based on the progress. We built the claw first. It needed to be strong enough to pick up and hold the dice cup securely. Next, we attached the “wrist” servo motor. This motor does the shaking and tipping. The NXT is connected to the base assembly where the “elbow” motor is mounted. That motor does all of the lifting. The biggest problem we encountered was that the servo motor used for lifting wasn’t powerful enough to lift the arm, claw, and the dice cup on it’s own. That was our version one. For V2, we rebuilt the lifting portion to include a gear ratio of 5:1. By increasing the motor power by five times, it now lifts the arm with no problem. This robotic arm adds a lot of fun to any game that uses dice.

Posted by:

 Tyler9289

Created:

 18 January 2010

Rate:

 

Tags:(?):

 roboticarm, arm, dice, games, fun, claw, lift, tilt, shake, throw, video

Version 2.0 - The 5:1 Gear Ratio

The addition of the gears fixed the problem that we had with the servo motor being under powered on it's own. a few extra beams added reenforcement to this powerful joint.

Version 2.0 - LED Stage indicators

The color sensor acts as an indicator that changes at the three stages: Green=Ready, Red=Shaking, and Blue=Reset.

Comments

10 most recent comments out of 24  [VIEW ALL]

  • Phil-10

  • very good, but can i have the LDD

  • Posted 1107 days and 6 hours ago


  • KevinJZhang

  • Cool! But which game did you play with this robot?

  • Posted 1078 days and 16 hours ago



  • MagicSlifer

  • So Cool

  • Posted 1004 days and 14 hours ago


  • hakajoo

  • This is realy a great machine. Please make LDD. 5/5 :-)

  • Posted 997 days and 7 hours ago


  • minifig2222

  • Wow. Could you make an LDD? Please?

  • Posted 963 days and 13 hours ago


  • tahubird

  • y u needed a machine to roll dice is more than i can say, what you should build next is a robot that tells you what the total is! it is really good for a first progect!

  • Posted 962 days and 7 hours ago


  • Tyler9289

  • Those LDD files can take a lot of time. Maybe I can make one this winter. Thank you for your interest in this project.

  • Posted 941 days and 0 hours ago


  • lepa_fg

  • Wonderful Project! Building Instruction! Building Instruction! Building Instruction! Building Instruction! Building Instruction!

  • Posted 789 days and 12 hours ago


  • agentsky1022

  • i want an ldd.

  • Posted 365 days and 1 hour ago


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