3. Smart Cutebot Samples for Python

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3.1. Add Python File

Download to unzip it: EF_Produce_MicroPython-master Go to Python editor

We need to add Cutebot.py for programming. Click “Load/Save” and then click “Show Files (1)” to see more choices, click “Add file” to add Cutebot.py from the unzipped package of EF_Produce_MicroPython-master.

3.2. API

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CUTEBOT(object)

Create an object.

set_motors_speed(self, left_wheel_speed: int, right_wheel_speed: int)

Set the speed of both wheels:

    `left_wheel_speed: int` Speed of the left: -100～100
    `right_wheel_speed: int` Speed of the right: -100～100

set_car_light(self, light: int, R: int, G: int, B: int)

Set the color of the headlights：

    `light`:Choose the lights
    `R`:channel color-255`
    `G`:channel color-255`
    `B`:channel color-255`

get_distance(self, unit: int = 0)

Get the distance from the ultrasonic sound sensor:

    `unit`detecting the distances:` 0 `cm,` 1 `lnch

get_tracking(self)

Get the status from the tracking headers:

    return:`00` all in white
           `10` left in black and right in white
           `01` left in white and right in black
           `11` all in black

set_servo(self, servo, angle)

Choose the servos and set the angles/speed:

        `servo (number)`choose the servos 1,2
       `angle (number)`set the angles of the servo 0~180

3.3. Samples

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Sample 1: Drive the car at a full speed.

from microbit import *
from Cutebot import *
ct = CUTEBOT()
ct.set_motors_speed(100, 100)

Result

• The speed of the left and right wheels is at 100, the car moves forward at the full speed.

Sample 2: Turn the headlights on

from microbit import *
from Cutebot import *
ct = CUTEBOT()
ct.set_car_light(left, 0, 90, 90)
ct.set_car_light(right, 200, 200, 0)

Result

• The two headlights light up in different colours.

Sample 3: Obstacles avoidance

from microbit import *
from Cutebot import *

dis = CUTEBOT()

while(True):
    i = dis.get_distance(0)
    if i>3 and i<20:
        dis.set_motors_speed(-50, 50)
        sleep(500)
    else:
        dis.set_motors_speed(50, 50)

Result

• The Cutebot turns its direction once it detects any obstacle ahead of it.

Sample 4: Line-tracking

from microbit import *
from Cutebot import *

dis = CUTEBOT()

while(True):
    i = dis.get_tracking()
    if i == 10:
        dis.set_motors_speed(10, 50)
    if i == 1:
        dis.set_motors_speed(50, 10)   
    if i == 11:
        dis.set_motors_speed(25, 25)  

Result

• The Cutebot drives along with the black line.

Sample 5: Control the servo

from microbit import *
from Cutebot import *

dis = CUTEBOT()

while(True):
    dis.set_servo(0,180)
    sleep(1000)
    dis.set_servo(0,0)
    sleep(1000)

Result

• The servo connecting to S1 continues driving back and forth.

3.4. FAQ

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About the reported error:

|ValueError|Error content| |:—:|:—:| |speed error,-100~100|The speed of the left/right wheel is beyond the threshold that we set| |RGB is error|The parameter of the color of the headlight is beyond the threshold that we set| |select servo error,1,2|The parameter of the servo connections is wrong| |angle error,0~180|The setting to the angles of the servos is wrong|

3.5. Relevant Case

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3.6. Technique File

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