14. case 05 Crazy dance

14.1. Our Goal

To make the Ring:bit car to dance in free style.

14.2. Requiered Materials

1 x Ring:bit Car

14.3. Hardware Connect

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

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.

Step 3

Snap blocks into forever block.
Set an varieble to left and an variable to right.
Generate a random number and assinment to the left and the right.

../../_images/2PPYJ0T1.png

Step 4

Set the left wheel speed to the variable left abd the right wheel speed to the variable right.
Pause for one second.

../../_images/HSujBjF1.png

Program

Program Link：https://makecode.microbit.org/_WrC1kWhizc6E

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 runs at different speed.

../../_images/j6kX56N1.jpg

14.7. Think

How do you ensure the car moves at a slower speed constantly?