# 9. Case 01: Full Speed Ahead#

## 9.1. Introduction#

Hello, we are going to code to drive the Ring:bit car to do some interesting projects in this lesson, of course we will explain the knowledge from easy to deep, this lesson will implement the Ring:bit car to complete the basic forward and backward actions, let’s start.

## 9.2. Hardware Connect#

Connect the left wheel servo to P1 of the Ring:bit expansion board and the right wheel servo to P2. You can also exchange the connections as long as you program with the equivlent connections in MakeCode, let’s move on!

## 9.3. Software Programming#

You should prepare the programming platform ready, if not, please can refer to this essay: Preparation for programming

### Sample Projects#

```# Import the modules that we need
import board
from ringbit import *
from picoed import *

# Set the pins of the servos
ringbit = Ringbit(board.P1, board.P2)

# While ture, detect if button A/B is pressed to control the movement of the car
while True:
if button_a.is_pressed():
ringbit.set_speed(100, 100)
elif button_b.is_pressed():
ringbit.set_speed(-100, -100)

```

### Details of program:#

1. Import the modules that we need. `board` is the common container, and you can connect the pins you’d like to use through it; `ringbit` module contains classes and functions for Ring:bit smart car operation and `picoed` module contains the operation functions to button A/B.

```import board
from ringbit import *
from picoed import *
```
2. Set the pins of the servos.

```ringbit = Ringbit(board.P1, board.P2)
```
3. While ture, detect if button A/B is pressed to control the movement of the car.

```while True:
if button_a.is_pressed():
ringbit.set_speed(100, 100)
elif button_b.is_pressed():
ringbit.set_speed(-100, -100)
```

## 9.4. Result#

Press button A to drive the car at its full speed;

Press button B to reverse the car.

## 9.5. Exploration#

How to program to stop the car by pressing both A/B at the same time?