EV3 Arm Stack/ Arm Control

1. This photo shows the EV3 robot with the arm attachment in the front. Which port would be the best choice to connect the arm to the brick?

• 3
• B
• A

2. This photo shows the arm in the "up" position. The screen is showing PORT VIEW. Which port is selected in PORT VIEW in this picture, and what is plugged into that port?

• Port 1 is selected and the touch sensor is connected to port 1
• Port A is selected and the touch sensor is connected to that port.
• Port A is selected and the arm is connected to that port.

3. This picture shows PORT VIEW. Which port is selected and what is connected to that port?

• Port 1 , touch sensor
• Port A, touch sensor
• Port A, motor for arm

4. Note that the PORT VIEW screen has been zeroed with the arm in the "up" position. What will happen if the arm is moved down?

• Port view will show the number of degrees the motor moves when it moves the arm.
• Port view will measure how much the wheels roll.

5. This picture shows PORT VIEW after the arm was moved all the way down to the floor as FAR AS IT CAN GO. Each robot is a little different. The maximum number of degrees this robot can move its arm is 143. Why can't it move the arm more than that?

• The arm has hit the floor and is stuck. It cannot move any farther.
• The medium motors can't move very far because they are smaller motors.

6. What does the first pink block in this stack cause the robot to do?

• Move motors B and C so that the wheels turn and the robot moves forward.
• Move motors A and B so that the wheels turn and the robot moves forward.

7. What is the symbol the arrow is pointing to?

• greater than
• less than

8. With this stack, the programmer wants the robot to move forward until the ultrasonic sensor senses an object 5cm in front of it. Then the robot will stop. After the robot stops, the programmer wants the arm to go all the way down and have the robot move backward for one rotation of the wheels. Will this work?

• Yes, because the number of degrees the arm is able to move down was -143, so -160 should be enough.
• No, because the number of degrees the arm is able to move down was -143, so it cannot move down -160.

9. The goal is to get the robot to move forward, stop 5cm in front of the object, move the arm and then back up. This program won't work either. Why not?

• The arm will only go down one degree, so it won't go down far enough.
• One rotation is equal to 360 degrees, so it is still too far.

10. This stack will work. Which ports must the ultrasonic sensor and the arm motor be connected to?

• ultrasonic sensor: port 4, arm motor: port A
• ultrasonic sensor: port 5, arm motor: port A