122 lines
4.3 KiB
Markdown
122 lines
4.3 KiB
Markdown
# Use
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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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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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Build the robot driving base:
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[](https://le-www-live-s.legocdn.com/sc/media/lessons/mindstorms-ev3/building-instructions/ev3-rem-driving-base-79bebfc16bd491186ea9c9069842155e.pdf)
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### ~hint
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If clicking the above image doesn't open the instructions, right-click on the image and choose "Save link as..." to download the PDF.
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### ~
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## Make It Move
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**Code it:** 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 ``||motors:steer large motors B+C||`` block inside an ``||brick: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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**Download:** 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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**Code it:** Create a new program that turns the Driving Base 180 degrees.
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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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### ~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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**Download:** 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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Build and attach an Ultrasonic Sensor to your driving base:
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[](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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### ~hint
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If clicking the above image doesn't open the instructions, right-click on the image and choose "Save link as..." to download the PDF.
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### ~
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## Detect an Object
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**Code it:** 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 ``||motors:tank large motors B+C||`` motor block inside the ``||brick:on button||`` block.
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* Drag the Ultrasonic Sensor threshold ``||sensors:set ultrasonic 4||`` block and place it below the motor block.
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* Drag a ``|sensors:pause until ultrasonic 4||`` block and place it under the threshold block.
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* Drag a ``||motors: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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**Download:** 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. Change and test the number value of the Ultrasonic
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Sensor.
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```typescript
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sensors.ultrasonic4.setThreshold(UltrasonicSensorEvent.ObjectDetected, 10)
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```
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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 [Design Engineering](/design-engineering), [Coding](/coding), or [Maker](/maker) activity.
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