# 11. Case 03: Turn at An Angle#

## 11.1. Introduction#

Hello, we’ve learnt how to run a shape in case 02, but how can we draw a circle with the Ring:bit car? Let’s start this case with the question.

## 11.2. Hardware Connection#

Also with the same assembly steps with former practices, connect the left wheel servo to P1 of the Ring:bit board and the right wheel servo to P2.

Use a rubber band to fix a pencil on the base board of the Ring:bit car.

## 11.3. 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.P2, board.P1)

# While true, detect if button A/B is pressed to make the [Ring:bit](https://shop.elecfreaks.com/products/elecfreaks-pico-ed-ring-bit-v2-car-kit-with-pico-ed-board?_pos=2&_sid=18032a345&_ss=r) car drive the circle or stop.
while True:
if button_a.is_pressed():
ringbit.set_speed(-100, -50)
elif button_b.is_pressed():
ringbit.set_speed(0, 0)
```

### 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; `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.P2, board.P1)
```
3. While true, detect if button A/B is pressed to make the Ring:bit car drive the circle or stop.

```while True:
if button_a.is_pressed():
ringbit.set_speed(-100, -50)
elif button_b.is_pressed():
ringbit.set_speed(0, 0)
```

## 11.4. Result#

On button A pressed, the car draws a circle.

On button B pressed, stop the car.

## 11.5. Exploration#

How can you make your car draw a figure of eight?