# 21. Case 11: Control the Ring:bit Car with the Joystick:bit#

## 21.1. Purpose#

• Control the ring:bit car via the Joystick:bit.

1 × Joystick:bit

## 21.3. Software#

MicroSoft makecode

## 21.4. Programming#

### Step 1#

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

### Step 2 Coding#

We need to add a package for programming. Click “Extensions” in the bottom of the drawer and search with “Ringbit” in the dialogue box to download it.

Note: If you met a tip indicating it might be deleted due to incompatibility, you may continue as it indicates or create a new project in the menu.

In the on start brick, set the radio group as 1, please make sure it is in the same radio group with the remote controlling end so they can match.

Drag two “if…else…” bricks into the on radio data received brick, judge if the recevied value “name” is X or Y.

If “name” is x, set it as the data of xValue.

If “name” is y, set it as the data of yValue.

In forever brick, set the speed of the left wheel as yValue+xValue and the speed of the right wheel as yValue-xValue.

### Step 3 Coding the Joystick:bit#

We need to add a package for programming. Click “Extensions” in the bottom of the drawer and search with “joystickbit” in the dialogue box to download it.

Note: If you met a tip indicating it might be deleted due to incompatibility, you may continue as it indicates or create a new project in the menu.

In the on start brick, set the radio group as 1;

The value of X and Y ranges from 0~1023, the theoretical value is 512 while the Joystick is placed in the middle position, thus we need to map that range to -100~100;

In forever brick, set the value of x is among -100~100 mapping from x-axis;

In forever brick, set the value of y is among -100~100 mapping from y-axis;

Send the value of x and y via radio.