14. case 04 Here comes the police#

14.1. Our Goal#

  • To change the Ring:bit car to a police car.

14.2. Requiered Materials#

14.3. Hardware Connect#

  • Connect the left wheel servo to P1 of the Ring:bit expansion board and the right wheel servo to P2.

  • Connect the ring:bit car special expansion board to the P0. ../../_images/D5sFydb.jpg

  • Slide the clip switch of the special expansion board to the Rainbow LED.

../../_images/s3rVwxZ.jpg

14.4. Software#

makecode

14.5. Coding#

Step 1#

  • Click on “Advanced” in the MakeCode Drawer to see more code sections.

../../_images/2qCyzQ71.png

  • Search for “ringbitcar” and click on the ring:bit car package to add it to your project. (As below picture)

../../_images/1Wq2Mov1.jpg

Note： If you get a warning telling you some packages will be removed because of incompatibility issues, either follow the prompts or create a new project in the Project file menu.

Step 2#

  • Snap the block set left wheel at pin P1 right wheel at pin P2 to the On start block. The port number is based on the actual servo connection port.

  • Go straight at full speed.

  • Set the 2 Rainbow LED of the P0 to RGB color.

../../_images/J7eFoDN.png

Step 3#

  • Within the forever block, snap below blocks in line:

  • show color red block.

  • pause(ms) 100 block.

  • show color blue block.

  • pause(ms) 100 block.

../../_images/CqsUljq.png

Program#

Program Link：https://makecode.microbit.org/_AvMC6j86A5ym

If you don’t want to type these code by yourself, you can directly download the whole program from the link below:

14.6. Result#

  • The car goes straigt at full speed at red and blue flash.

../../_images/E4XxlGK.jpg

14.7. Think#

  • How can you make youe car at yellow and white flash?

14.8. Questions#

14.9. More Information#