In the last post, I analyzed three models used for WRO 2020, Elementary age group competition. In this post, I will continue analyzing several models used for WRO 2019, Elementary groups. All those videos are from YouTube channels.

Model 1

This model comes from author: Thầy Phong STEM.

It uses two medium motors to control two front attachments, respectively. The attachments are designed like two frames. When it spins up, the block figure is loosened. When it spins down, the frame is closed and the block figure could be locked inside.

The vehicle uses the two colour sensors attached in the front to guide itself on the competition field. Another two colour sensors are mounted facing toward the enclosed block figures to identify their colours.

Routes on WRO 2019 map are planned clearly. The vehicle usually follows those routes to reach each target area for loading and unloading. Sometimes, estimating the turning angle is also beneficial. For example, when the vehicle drives to approach red area (“Shopping Center Area”), it drives off the main route and turns to right a little bit so that it could take a shortcut to pick up its “passenger” faster.

Model 2

In this model, there are two sensors mounted tilted over the front attachment to detect the color of block figures. Different from other models, it uses Reflective Intensity Light mode to identify the route, therefore, it puts the 3rd and 4th colour sensors under its body to shield them from external light interference.

Its front attachment is also divided into two independent units, controlled by two medium motors, respectively. The arm-like structures could be opened, and then closed to hold the “passengers” inside.

One problem shown in this video is that the vehicle runs too fast. It should at least pause for a few seconds when dismantling the blocks. This explains why one block falls down. Generally, it is a very flexible and compact model.

Model 3

In this model, there are two sensors side by side sitting in front of the model to guide it run on the field. The 3rd and 4th HiTechnic colour sensors are installed facing opposite directions to identify the block colors.

Its front attachment is also divided into two independent units. They are controlled by two medium motors, respectively. The stick-like structures could be rotated to clamp the blocks or loosen them. The attachment structure is similar to that of model 2, but if you observe the above video carefully, you will notice that the rotation direction is different. In the 2nd model, the arm rotates horizontally, while in this model, the arm rotates vertically.

In terms of route planning, this model runs very smoothly. Sometimes, it drives off the main route to take a shortcut. For example, when it sends the yellow block figure to Cinema Area, it drives off the main route (with black line) and then turns a bit left to send its passengers to their destination directly.

That is all for the introduction of the models for WRO 2019 elementary group. Now come to design your own models!

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