可在 http://python.microbit.org/v/1 中使用

microbit_cx.py

from microbit import *  # sleep, uart, button_a, display
import random


uart.init(115200)


def display_handler(data):
    '''  : String -> None '''
    convert = {
        'happy': Image.HAPPY,
        'smile': Image.SMILE,
        'sad': Image.SAD,
        'heart': Image.HEART,
        'heart_small': Image.HEART_SMALL,
        'yes': Image.YES,
        'no': Image.NO,
        'confused': Image.CONFUSED,
        'angry': Image.ANGRY,
        'asleep': Image.ASLEEP,
        'surprised': Image.SURPRISED,
        'silly': Image.SILLY,
        'meh': Image.MEH,
        'fabulous': Image.FABULOUS
    }
    display.show(convert[data], wait=True, loop=False)
    dic = {"type": "actuator"}
    return str(dic) + "\n"


def get_sensors(data):
    '''
    here: sensor pub message
    '''
    # while True:
    a = button_a.is_pressed()
    b = button_b.is_pressed()
    x = accelerometer.get_x()
    y = accelerometer.get_y()
    z = accelerometer.get_z()

    dic = {
        "id": "microbit",
        "topic": "sensor",
        "data": {
            "button_a": a,
            "button_b": b,
            "x": x,
            "y": y,
            "z": z
        }
    }
    return str(dic) + "\n"


def random_handler(data):
    '''  : Number -> None '''
    number = random.randint(1, int(data))
    display.show(str(number), wait=True, loop=False)
    dic = {"type": "actuator"}
    return str(dic) + "\n"


def scroll_handler(data):
    '''  : Number -> None '''
    display.scroll(data, wait=True, loop=False)
    dic = {"type": "actuator"}
    return str(dic) + "\n"


def clear_handler(data):
    '''  : () -> None '''
    display.clear()
    dic = {"type": "actuator"}
    return str(dic) + "\n"


match = {
    'actuators/display': display_handler,
    'sensor': get_sensors,
    'actuators/random': random_handler,
    'actuators/say': scroll_handler,
    'actuators/clear': clear_handler
}


def get_topic_and_data(b):
    # 两种请求都使用一样的结构,只是topic不同
    try:
        b = b.strip()
        json_str = str(b, 'utf-8')
        json = eval(json_str)
        # :todo check key data, topic
        if not json.get('topic'):
            return
        topic = str(json.get('topic'))
        data = str(json.get('data'))
        return topic, data
    except:
        display.show(str("!"))
        return None

def on_callback_req(topic, data):
    '''
    对请求的响应
    '''
    handler = match[topic] # 请求数据也是一种topic: sensor
    result = handler(data) # 统一返回
    # uart.write(bytes(result, 'utf-8') + b"\r\n")
    uart.write(bytes(result, 'utf-8'))


r_merge = b''

while True:
    r = uart.readline()
    if r:
        r_merge += r
        if r_merge.startswith(b'{') and r_merge.endswith(b'\r\n'):
            d = get_topic_and_data(r_merge)
            if d:
                topic, data = d
                on_callback_req(topic, data)
            r_merge = b''