Micro:bit handle control

1. Learning objectives

In this course, we mainly learn how to use MakeCode graphical programming to realize the control of the Mobile shooter with the microbit handle.

2. Building blocks

For the building blocks steps, please refer to the installation drawings of [Assembly Course]-[Mobile shooter] in the materials or the building blocks installation book.

3. Motor wiring

Insert the motor wiring on the left side of the car into the M1 interface of the Super:bit expansion board, and the black wire is close to the battery side;

Insert the motor wiring on the right side of the car into the M3 interface of the Super:bit expansion board, and the black wire is close to the battery side;

Insert the building blocks servo wiring into the S1 interface of the Super:bit expansion board, and the orange servo wiring is inserted into the yellow pin of S1.

As shown in the figure below:

! Notes:

When taking a course related to building block servos for the first time, we need to remove the large gear installed on the servo and upload the program of this course to micro:bit; then turn on the power switch of the Super:bit expansion board and wait for the building block servo to turn to the initial position; then, we can turn off the power, adjust the angle of the car projection rod to be parallel to the ground, and then install the servo gear. (If you have used the Mobile shooter and servo-related programs before, you can skip this step)

4. Programming

Method 1 Online Programming:

First, connect micro:bit to the computer via a USB data cable, and a U disk will pop up on the computer. Click the URL in the U disk: https://makecode.microbit.org/ to enter the programming interface. Then, add the Yabo smart software package to program.

Method 2 Offline Programming:

Open the offline programming software MakeCode and enter the programming interface. Click [New] and add the Yahboom smart software package to start programming.

superbit kit expansion package: https://github.com/YahboomTechnology/SuperBitLibV2 Handle expansion package: https://github.com/YahboomTechnology/GHBitLib

4.1 Add expansion package

4.2 Building blocks used

The location of the building blocks required for this programming is shown in the figure below.

4.3 Add new variables

① Find the [Variable] option in the building block bar ---- [Set variable]

② Enter the variable name to complete the new variable.

4.4 Combined blocks

The microbit summary program on Mobile shooter is shown in the figure below

Handle rocker control program is as follows

Handle gravity control program is as follows

You can also directly open the microbit-Handle-control-mobile-shooter.hex, microbit-Handle-rocker-control.hex, microbit-Handle-gravity-control.hex files provided in this experiment and drag them into the browser that opens the URL, and the program diagram of this project source code will be automatically opened

5. Experimental phenomenon

We need to download the Mobile shooter program to the micro:bit motherboard of the Mobile shooter, turn on the power switch of the Mobile shooter, and we can see a smiley face pattern displayed on the micro:bit dot matrix;

Download the handle remote control program to the micro:bit motherboard of the handle, turn on the power switch of the handle, and we can see that the micro:bit dot matrix will initialize to display a heart pattern, and then display an "X" pattern, indicating that the handle is in the default state and no data is sent.

The two will automatically pair, and then we can start remotely controlling the Mobile shooter.

The handle functions are as follows.

!Note: When the handle is controlled by the joystick, press the joystick to turn off the RGB light. This function does not exist when the handle is controlled by gravity.