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# Two rear motors on BigDaddy Competition Construction Robot (Part 10) ProPreview

Based on a request we are showing the robot construction with two rear motors instead of a differential. In this way, as a construction, it is closer to more students, but much more challеnging for programing.

• #81
• 26 Apr 2015
• 9:43

### The two rear motors VS the differential

Many LEGO Mindstorms robot constructions use two rear wheels controlled by two different motors. Students are used to this kind of construction. The differential is a little bit more abstract and difficult to understand and use properly. Based on a request we have decided in this video tutorial to show the Big Daddy construction implemented with two rear motors and one front motor. Programming this construction would be challеnging so we have prepared a challеnge (see the task).

### Two rear motors on BigDaddy Competition Construction Robot

Advanced LEGO MINDSTORMS EV3 Construction. It has two rear motors and it could rotate the whole from part. It has 4 wheels and is kind of like unique in the Mindstorms world.

Building instructions are not very easy and you need LEGO Education Core and Extension Sets - 45544 and 45560.

Apart from being advanced, it is also quite fun to try to build.

### BigDaddy Front - front wheels mechanism module for a large LEGO Mindstorms Competition Robot

We've separated the BigDaddy robot into a few smaller modules. This teaches modularity and gives you the option to reuse some of the modules and to look at specific modules.

### BigDaddy Front Frame - frame for the front wheels

You can attach a frame around the front wheels to make them more stable and to allow for better aligning. The module extends the front wheel built at BigDaddy Front - front wheels mechanism module for a large LEGO Mindstorms Competition Robot

How would you program this LEGO Mindstorms robot to move? It probably requires controlling the three motors in parallel. Use the task in your classroom, for your team or at home to set a challenging programing problem.

There are 3 task from an normal, medium, hard complexities giving 1, 2, 3 points respectively

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