Skip to main content

Case 10: Speed Adjustable Car

Introduction​

This is an adjustable speed car, we can control the speed of the it through the potentiometer installed at the back side.

Quick Start​

Materials Required​

Nezha expansion board × 1

micro:bit × 1

Potentiometer × 1

Motors × 2

RJ11 wires × 1

Tips: You may need to purchase Nezha Inventor's Kit if you want all the above compoents.

Connection Diagram​

Connect the potentiometer to J1, the two motors to M1&M4 on the Nezha expansion board as the picture shows.

Assembly Video​

Video reference: https://youtu.be/bVa5-wrcoeA

Assembly Steps​

MakeCode Programming​

Step 1​

Click "Advanced" in the MakeCode to see more choices.

For programming, we need to add a package: click "Extensions" at the bottom of the MakeCode drawer and search with "PlanetX" in the dialogue box to download it.

For programming, we need to add a package: click "Extensions" at the bottom of the MakeCode drawer and search with "nezha" in the dialogue box to download it.

Notice: If you met a tip indicating that some codebases would be deleted due to incompatibility, you may continue as the tips say or create a new project in the menu.

Step 2​

Code as below:​

Reference​

Link：https://makecode.microbit.org/_cTDgmegXA5ip

You may also download it directly below:

Result​

The speed of the car could be adjusted by the potentiometer.