Feb+5th

For a grade: Cropped screen shot of at least one turn showing a marker. Calculation for at least the first turn using the numbers on the marker in the screen shot..)

Make the following link on you Virtual World page. "Labyrinth"

To Start the lesson: Select the robot tab and the REMBot with Touch

Know your robot. Above are the specifications for the REMBot with touch sensor.
 * [[image:robotstpjhs/REMBotTouchSizesPorts.png caption="REMBotTouchSizesPorts.png"]] ||
 * REMBotTouchSizesPorts.png ||

Now select the movement tab and then Labyrinth Challenge. Then select "Start activity." On the "Labyrinth" page you will show and tell how you programmed your robot to complete this challenge.

Programming a path or route is done in a connect the dots fashion. At each dot the robot turns and then goes the distance to the next dot. Thus, a route consists of a series of turns and distances traveled between the turns. Each turn aims the robot in the correct direction to reach the next dot. In other words, each turn puts the robot on the correct course. Once the robot is aimed in the correct direction, it must go the correct distance to the next turn. These turns and distances can be measured to make your program.

Markers are used to set up a route. Markers are placed at each turn. The makers display the turns and distances that are used in the calculations to program the robot. Here are the steps to place makers to get the needed information. Click "Camera 3" to view more of the arena. Click the "SHOW" button to activate the distance sensor. Click the "ADD" button to add a marker and get measurements. Now click the place in the arena where the robot needs to go next.

1. On the "Labyrinth" page and write: First Move: Then put a cropped screen shot of your first marker. Here are examples using camera 2 and camera 3.

You can set all your marker at once and only do one screen shot rather than a doing a screen shot for each move.
 * [[image:robotstpjhs/labCourse1jcl.png width="311" height="320" caption="labCourse1jcl.png"]] || [[image:robotstpjhs/Labcourse1tjcl.png width="509" height="252" caption="Labcourse1tjcl.png"]] ||  ||   ||   ||

2. Now present the calculation for the first turn. The "+" in front of the number means a right turn. A "-" in front of the number means a left turn. Once the Turn Distance is calculated, use the Turn Distance to calculate the rotations that you would put in the program.

For example:

Equations needed: Circumference = 2(Radius) x 3.14
 * [[image:robotstpjhs/REMBotTouchSpec.png caption="REMBotTouchSpec.png"]] ||
 * REMBotTouchSpec.png ||

Wheel Circumference = 2(3.1) x 3.14 = 19.47cm Turn Circle Circumference = 2(15) x 3.14 = 94.20cm

Circumference || Substitute: Step 1: Divide the top by the bottom on the left side of the equal sign. Divide 10.01 by 360 = 0.0278 (Note four places kept after the decimal) Step 2: Multiply both sides of the equation by 94.20cm to get Turn Distance by itself. 2.619cm = Turn Distance
 * __Turn Degrees__ ||  || = ||   || __Turn Distance__ ||   ||   ||   ||   ||
 * 360 Degrees ||  ||   ||   || Turn Circle
 * __10.01__ ||  || = ||   || __Turn Distance__ ||   ||   ||   ||   ||
 * 360 Degrees ||  ||   ||   || 94.20cm ||
 * 94.20cm x || __0.0278__ ||  || = ||   || __Turn Distance__ || x 94.20cm ||   ||   ||   ||
 * ||  ||   ||   ||   || 94.20cm ||

Now the rotations for the program must be determined from the Turn Distance above.

Distance = Wheel Circumference x Rotations Substitute values into the above formula and solve for Rotations.

Step 1: Divide both sides of the equation by 19.47cm 0.134 = Rotations.
 * || 2.62cm || = || 19.47cm || x Rotations ||