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VIQC Virtual Skills
Lesson 2

Use Estimates to Score Points

When you are coding, you will need to estimate the distance that Fling needs to drive and turn to score. This section will break down how we estimated the distance that Fling had to turn and drive to score the first Ball in Lesson 2.

Estimating Turn Angles

You created this project in Lesson 2 to have Fling score the first Ball. We're going to recreate the project and walk through the steps for estimating the turn angle and drive distance needed to successfully push the Ball into the Low Goal to score.

Image of VEXcode IQ project from Lesson 2

First, Fling has to turn to face the Ball. We can use what we know about angles to estimate how far Fling will have to turn.

Image of the Ball highlighted

We can see that the turn needed is less than 90 degrees. We can also see that it is less than 45 degrees. The turn is a little more than one-half of 45 degrees.

Using these angles as a reference, we can estimate the turn for 25 degrees.

Image of the robot on the field with possible left turn angles shownd

Once we have estimated the turn angle, we input that value into the [Turn for] block and change the turn parameter to 'left.'

image of turn for block parameters changed to left and 25 degrees

Then, we test the project to see if our estimate causes Fling to face the Ball.  It does, so the estimate was correct, and we can move on.

Image of robot turned toward the first Ball

Pro-tip: You can use these basic turn angles as a starting point to make more precise estimates as you code Fling to turn and drive to other Balls and score more points. 

Note: The turning point for Fling is in the center of the drivetrain, shown here with the red circle. Keep this in mind as you estimate turns in your code.

image of Fling with degrees of turns called out and the pivot point of the robot highlighted

Estimating Drive Distances

Now that we’ve turned Fling to face the Ball, the robot has to drive forward far enough to push the Ball into the Low Goal.

image showing how robot has to drive forward to push ball into low goal

We can use the Field Tile to estimate how far Fling will have to drive to push the Ball into the Low Goal.

Each Field Tile is 300 mm (~12 inches) by 300 mm (~12 inches).

image of 1 square on the field with 300mm by 300 mm measurement highlighted

It looks like the distance that Fling has to drive forward to reach the Low Goal is approximately one-half of a Field Tile which would be 150 mm. 

image showing the distance that the robot has to drive to push the ball in the Low Goal

We can use this as our estimate and add it in the [Drive for] block.

image of project w/ estimate input in the drive for block

Then, test the project to see if Fling reaches the Ball. Fling doesn’t drive far enough to push the Ball into the Goal.

image showing that the robot does not drive far enough

We should increase the distance in the [Drive for] block, and try again. It looks like Fling just needed to go a little further.

One-half of a Field Tile wasn't far enough, let's try approximately three-quarters of the distance of a Tile — 225 mm.

image of project w/ second estimate input in the drive for block

Fling scores a goal! 

By using the squares on the Field as a guide to make our first estimate, then testing our projects and making adjustments, we were able to find the distance to have Fling drive to push the Ball into the Low Goal.

the robot pushes the ball into the goal successfully

Go Use Estimation to Score!

See this article for more information on the VIQC Virtual Skills Field dimensions to help you use the Field features to make estimates when coding Fling.

Select Return to Lessons  to go back to the Lesson Overview.

Select Next Lesson > to continue to Lesson 3, and learn how to score a Ball in the High Goal.