Met de functies in deze klasse kan je leds aan of uit zetten, of een korte tekst laten scrollen op het scherm
Source code in src/kaspersmicrobit/services/led.py
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101 | class LedService:
"""
Using the functions in this class you can turn LEDs on or off, or scroll a short text on the screen
"""
def __init__(self, device: BluetoothDevice):
self._device = device
def is_available(self) -> bool:
"""
Checks whether the LED Bluetooth service is found on the connected micro:bit.
Returns:
true if the LED service was found, false if not.
"""
return self._device.is_service_available(Service.LED)
def show(self, led_display: LedDisplay):
"""
Turn on the LEDs on the micro:bit as indicated in the LEDs parameter
Args:
led_display: the on/off state of the LEDs
Raises:
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to write the LED display (normally does not occur)
"""
self._device.write(Service.LED, Characteristic.LED_MATRIX_STATE, led_display.to_bytes())
def read(self) -> LedDisplay:
"""
Read the on/off values from the micro:bit LED display
Returns:
the on/off state of the LEDs
Raises:
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to read the LED display (normally not present)
"""
return LedDisplay.from_bytes(self._device.read(Service.LED, Characteristic.LED_MATRIX_STATE))
def show_text(self, text: str):
"""
Let the given text scroll by on the LED screen of the micro:bit. You can control the speed of scrolling
through the scrolling delay methods.
Args:
text: The text to be displayed (maximum 20 characters)
Raises:
ValueError: if text contains more than 20 characters
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to write the LED text (normally does not occur)
"""
octets = text.encode("utf-8")
if len(octets) > 20:
raise ValueError('Text too long, maximum 20 characters allowed')
self._device.write(Service.LED, Characteristic.LED_TEXT, octets)
def set_scrolling_delay(self, delay_in_millis: int):
"""
Adjust how quickly text scrolls by on the LED screen.
Args:
delay_in_millis: the time it takes for 1 letter to pass across the screen in milliseconds
Raises:
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to write the scrolling delay (normally does not occur)
"""
self._device.write(Service.LED, Characteristic.SCROLLING_DELAY, delay_in_millis.to_bytes(2, 'little'))
def get_scrolling_delay(self) -> int:
"""
Return how quickly a text scrolls past the screen
Returns:
the time it takes for 1 letter to pass across the screen in milliseconds
Raises:
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to read the scrolling delay (normally does not occur)
"""
return int.from_bytes(self._device.read(Service.LED, Characteristic.SCROLLING_DELAY)[0:2], 'little')
|
is_available
Kijkt na of de led bluetooth service gevonden wordt op de geconnecteerde micro:bit.
Returns:
-
bool
–
true als de led service gevonden werd, false indien niet.
Source code in src/kaspersmicrobit/services/led.py
| def is_available(self) -> bool:
"""
Checks whether the LED Bluetooth service is found on the connected micro:bit.
Returns:
true if the LED service was found, false if not.
"""
return self._device.is_service_available(Service.LED)
|
show
show(led_display: LedDisplay)
Zet de leds op de micro:bit aan zoals de leds parameter aangeeft
Parameters:
-
led_display
(LedDisplay)
–
de aan/uit staat van de leds
Raises:
Source code in src/kaspersmicrobit/services/led.py
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39 | def show(self, led_display: LedDisplay):
"""
Turn on the LEDs on the micro:bit as indicated in the LEDs parameter
Args:
led_display: the on/off state of the LEDs
Raises:
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to write the LED display (normally does not occur)
"""
self._device.write(Service.LED, Characteristic.LED_MATRIX_STATE, led_display.to_bytes())
|
read
Lees de aan/uit waarden van de micro:bit led display
Returns:
Raises:
Source code in src/kaspersmicrobit/services/led.py
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53 | def read(self) -> LedDisplay:
"""
Read the on/off values from the micro:bit LED display
Returns:
the on/off state of the LEDs
Raises:
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to read the LED display (normally not present)
"""
return LedDisplay.from_bytes(self._device.read(Service.LED, Characteristic.LED_MATRIX_STATE))
|
show_text
Laat de gegeven tekst voorbij scrollen op het led scherm van de micro:bit. De snelheid van het scrollen kan je
instellen via de scrolling delay.
Parameters:
-
text
(str)
–
De te tonen tekst (maximum 20 tekens)
Raises:
-
ValueError
–
indien text meer dan 20 tekens bevat
-
BluetoothServiceNotFound
–
Wanneer de led service niet actief is op de micro:bit
-
BluetoothCharacteristicNotFound
–
Wanneer de led service actief is, maar er geen manier was
om de led text te schrijven (komt normaal gezien niet voor)
Source code in src/kaspersmicrobit/services/led.py
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73 | def show_text(self, text: str):
"""
Let the given text scroll by on the LED screen of the micro:bit. You can control the speed of scrolling
through the scrolling delay methods.
Args:
text: The text to be displayed (maximum 20 characters)
Raises:
ValueError: if text contains more than 20 characters
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to write the LED text (normally does not occur)
"""
octets = text.encode("utf-8")
if len(octets) > 20:
raise ValueError('Text too long, maximum 20 characters allowed')
self._device.write(Service.LED, Characteristic.LED_TEXT, octets)
|
set_scrolling_delay(delay_in_millis: int)
Stel in hoe snel een tekst voorbijrolt op het led scherm.
Parameters:
-
delay_in_millis
(int)
–
de tijd die 1 letter er over doet om over het scherm voorbij te komen in milliseconden
Raises:
Source code in src/kaspersmicrobit/services/led.py
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87 | def set_scrolling_delay(self, delay_in_millis: int):
"""
Adjust how quickly text scrolls by on the LED screen.
Args:
delay_in_millis: the time it takes for 1 letter to pass across the screen in milliseconds
Raises:
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to write the scrolling delay (normally does not occur)
"""
self._device.write(Service.LED, Characteristic.SCROLLING_DELAY, delay_in_millis.to_bytes(2, 'little'))
|
get_scrolling_delay() -> int
Lees de hoe snel een tekst voorbijscrolt over het scherm
Returns:
-
int
–
de tijd die 1 letter er over doet om over het scherm voorbij te komen in milliseconden
Raises:
Source code in src/kaspersmicrobit/services/led.py
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101 | def get_scrolling_delay(self) -> int:
"""
Return how quickly a text scrolls past the screen
Returns:
the time it takes for 1 letter to pass across the screen in milliseconds
Raises:
errors.BluetoothServiceNotFound: When the LED service is not active on the micro:bit
errors.BluetoothCharacteristicNotFound: When the led service is active but there was no way
to read the scrolling delay (normally does not occur)
"""
return int.from_bytes(self._device.read(Service.LED, Characteristic.SCROLLING_DELAY)[0:2], 'little')
|