CodingPirates/microbit-micropython-cookbook
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Alan Wang
2021-04-24 15:28:22 +08:00
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@@ -148,7 +148,7 @@ from microbit import pin1, pin2, sleep
class Pin: class Pin:
__slots__ = ['pin'] # not to use dictionary to store attributes in order to save memory __slots__ = ['pin'] # not to use dictionary to store attributes in the class to save memory
def __init__(self, pin): def __init__(self, pin):
self.pin = pin self.pin = pin
@@ -237,31 +237,6 @@ while True:
sleep(100) sleep(100)
``` ```
## Servo Control
Note: currently (as for v2 beta) pin.set_analog_period throws ValueError and has been fixed in a future release.
```python
from microbit import pin0, sleep
def servoWrite(pin, degree):
pin.set_analog_period(20)
pin.write_analog(round((degree * 92 / 180 + 30), 0))
servoPin = pin0
while True:
servoWrite(servoPin, 0)
sleep(1000)
servoWrite(servoPin, 180)
sleep(1000)
```
Do not use servos and buzzers at the same time. They require different PWM frequencies and most microcontrollers can only use one frequency accross all pins at a time.
micro:bit V2 can output 190 mA from its 3V pin, which is enough for most hobby servos.
## Roll a Dice ## Roll a Dice
Define dice images in a dictionary, and retrieve one using a random number when the shake gesture detected. Define dice images in a dictionary, and retrieve one using a random number when the shake gesture detected.
@@ -371,6 +346,36 @@ while True:
print('Pitch:', rotationPitch(), ' / roll:', rotationRoll()) print('Pitch:', rotationPitch(), ' / roll:', rotationRoll())
sleep(100) sleep(100)
``` ```
## Servo Control
```python
from microbit import pin0, sleep
class Servo: # define a servo class
def __init__(self, pin, degree=90):
self.pin = pin
self.degree = degree
self.write(degree)
def write(self, degree):
self.pin.set_analog_period(20)
self.pin.write_analog(round((degree * 92 / 180 + 30), 0))
servo = Servo(pin0) # servo object
while True:
servo.write(0)
sleep(1000)
servo.write(180)
sleep(1000)
```
Do not use servos and buzzers at the same time. They require different PWM frequencies and most microcontrollers can only use one frequency accross all pins at a time.
micro:bit V2 can output 190 mA from its 3V pin, which is enough for most hobby servos.
## NeoPixel Rainbow/Rotation Effect ## NeoPixel Rainbow/Rotation Effect
This code is based on Adafruit's example with adjustable brightness level. This code is based on Adafruit's example with adjustable brightness level.