12. Case 10: Car Following with A Fixed Distance

12.1. Purpose


  • The Cutebot moves with a fixed distance between the car and your hands.

12.2. Materials


12.3. Software Platform


MicroSoft makecode

12.4. Programming


Step 1

  • Click the “Advanced” to see more choices in the MakeCode drawer.

https://raw.githubusercontent.com/elecfreaks/learn-cn/master/microbitKit/smart_cutebot/images/cutebot-pk-1.png

  • A codebase is required for Cutebot programming, click “Add Package” at the bottom of the drawer, search Cutebot in the dialogue box and download it.

https://raw.githubusercontent.com/elecfreaks/learn-cn/master/microbitKit/smart_cutebot/images/cutebot-pk-11.png

Note: If you met a tip indicating incompatibility of the codebase, you can continue with the tips or build a new project there.

Step 2

  • Drag the “set left wheel speed and right wheel speed” into the On start brick.

https://raw.githubusercontent.com/elecfreaks/learn-cn/master/microbitKit/smart_cutebot/images/case_10_01.png

Step 3

  • Set a Sonar variable to save the detected Cm value in the Forever brick.

  • If the detected value is between5 and 10 , the car stops moving.

  • If the detected value is below5 , the car reverses because of the short distance with the hands.

  • If not any, the car moves forward to catch up with the hands because of the far distance with the hands and then stay still .

https://raw.githubusercontent.com/elecfreaks/learn-cn/master/microbitKit/smart_cutebot/images/case_10_02.png

Programming

Links: https://makecode.microbit.org/_gRtPkmP0q0cM

You can also download it directly below:

---

12.5. Result


  • The Cutebot adjusts itself to keep a fixed distance with your hands.

12.6. Exploration

12.7. FAQ


12.8. Relevant Files