71. Case 67: The Blocks Emitter

71.1. Introduction

Use Nezha 48 IN 1 Inventor’s Kit and Potentiometer to make a blocks emitter that can control the firing frequency with a knob and can be loaded automatically.

71.2. Case Building

Materials Required

Nezha 48 IN 1 Inventor’s Kit

Potentiometer

Rubber bands

Assembly

Parts list

The structure is built as shown in the figure:

After the construction is completed, as shown in the following figure：

Connection Diagram

Connect the Potentiometer to J1 port, and the Motor to M1 port on Nezha Breakout Board .

71.3. MakeCode Programming

Step1

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

For programming the potentiometer, we need to add an extension library. Search with “PlanetX” in the dialog box to download this library.

For programming the Nezha expansion board, we need to add an expansion library. Search with “Nezha” in the dialog 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

Write the program as the picture suggests

Reference

Link: https://makecode.microbit.org/_L7shxbLtVJYY

You may also download it directly:

Result

The potentiometer allows you to control the firing frequency of the blocks emitter.