115 lines
3.7 KiB
Markdown
115 lines
3.7 KiB
Markdown
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# Use
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[IMG: EV3 Driving Base full w/cuboid]
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Build a robot and drive into the world of robotics!
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In this project we will guide you through building a Driving Base Robot and programming it to move straight and turn. You will also build and Object Detector Module, and program it to detect an object. It’s a good idea to have done the [Try](/getting-started/try) sequence first.
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## Connect
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[IMG: Apple Picker]
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What if your school had a multipurpose robot? How would you use it?
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Would you use it to clean the school or plant trees?
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## Build Your Driving Base Robot
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[IMG: EV3 Driving Base Building Instructions Cover Image]
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* [Building instructions](https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-rem-driving-base-79bebfc16bd491186ea9c9069842155e.pdf)
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## Make It Move
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[IMG: Program Blocks (see JavaScript below)]
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1) Create a program that makes the Driving Base move forward and stop at the finish line, which is 1 meter away.
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Start by building this program:
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```blocks
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brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.steer(0, 50, 1, MoveUnit.Rotations)
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})
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```
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* Drag a steer large B+C motor block inside the on button block
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* Click on the + sign
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* Change to 1 rotation
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### ~ hint
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Hint: You will have to modify the number of rotations until you find the number that matches the robot moving forward 1 meter and stopping.
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### ~
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2) Click Download and follow the instructions to get your code onto your EV3 Brick. Press the center button on the EV3 Brick to run the program.
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## Make It Turn
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[IMG: Program Blocks (see JavaScript below)]
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```blocks
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brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.steer(-50, 50, 1, MoveUnit.Rotations)
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})
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```
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1) Create a new program that turns the Driving Base 180 degrees.
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### ~ hint
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Hint: You will have to modify the turn ratio and the number of rotations until the robot reaches 180 degrees.
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### ~
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2) Click Download and follow the instructions to get your code onto your EV3 Brick. Press the center button on the EV3 Brick to run the program.
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## Add an Ultrasonic Sensor to Your Driving Base
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[IMG: EV3 Ultrasonic Sensor Driving Base Building Instructions Main Image]
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* [building instructions](https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-ultrasonic-sensor-driving-base-61ffdfa461aee2470b8ddbeab16e2070.pdf)
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## Detect an Object
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[IMG: Program Blocks (see JavaScript below)]
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1 - Create a program that moves the Driving Base and makes it stop ``6`` cm from the Cuboid.
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Create a new program
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```blocks
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brick.buttonEnter.onEvent(ButtonEvent.Pressed, function () {
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motors.largeBC.tank(50, 50)
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sensors.ultrasonic4.setThreshold(UltrasonicSensorEvent.ObjectDetected, 6)
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sensors.ultrasonic4.pauseUntil(UltrasonicSensorEvent.ObjectDetected);
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motors.stopAll()
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})
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```
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* Drag a tank large B+C motor block inside the on button block
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* Drag a threshold Ultrasonic Sensor block and place below the motor block
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* Drag a stop all motors block and place it below the sensor block
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### ~ hint
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Hint: You will have to modify the values of the Ultrasonic Sensor block until the robot reaches the desired position.
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### ~
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2) Click Download and follow the instructions to get your code onto your EV3 Brick. Press the center button on the EV3 Brick to run the program.
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Click on the JavaScript tab and change and test the number value of the Ultrasonic Sensor
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```typescript
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sensors.ultrasonic4.setThreshold(UltrasonicSensorEvent.ObjectDetected, 10)
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```
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[IMG: EV3 Ultrasonic Sensor Driving Base Building Instructions Main Image]
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**Congratulations!**
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You are ready to move on to the next steps.
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Try a LEGO MINDSTORMS Design Engineering, Coding, or Maker activity.
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