Home MIcro:bit
Category:

MIcro:bit

MIcro:bit

Microbit compass xample

by shedboy71
written by shedboy71

Compass

This module lets you access the built-in electronic compass. Before using, the compass should be calibrated, otherwise the readings may be wrong.

Warning:
Calibrating the compass will cause your program to pause until calibration is complete. Calibration consists of a little game to draw a circle on the LED display by rotating the device.

Functions

microbit.compass.calibrate()
Starts the calibration process. An instructive message will be scrolled to the user after which they will need to rotate the device in order to draw a circle on the LED display.

microbit.compass.is_calibrated()
Returns True if the compass has been successfully calibrated, and returns False otherwise.

microbit.compass.clear_calibration()
Undoes the calibration, making the compass uncalibrated again.

microbit.compass.get_x()
Gives the reading of the magnetic force on the x axis, as a positive or negative integer, depending on the direction of the force.

microbit.compass.get_y()
Gives the reading of the magnetic force on the x axis, as a positive or negative integer, depending on the direction of the force.

microbit.compass.get_z()
Gives the reading of the magnetic force on the x axis, as a positive or negative integer, depending on the direction of the force.

microbit.compass.heading()
Gives the compass heading, calculated from the above readings, as an integer in the range from 0 to 360, representing the angle in degrees, clockwise, with north as 0.

microbit.compass.get_field_strength()
Returns an integer indication of the magnitude of the magnetic field around the device.

Code

A python example written with the Mu editor

[codesyntax lang=”python”]

from microbit import *

compass.calibrate()
while True:
    bearing = compass.heading()
    print(bearing)
    sleep(100)

[/codesyntax]

 

Open the REPL to see the readings

 

0 comment
0 FacebookTwitterPinterestEmail
MIcro:bit

Microbit Accelerometer example

by shedboy71
written by shedboy71

Accelerometer

This object gives you access to the on-board accelerometer. The accelerometer also provides convenience functions for detecting gestures. The recognised gestures are: up, down, left, right, face up, face down, freefall, 3g, 6g, 8g, shake.

Functions

microbit.accelerometer.get_x()
Get the acceleration measurement in the x axis, as a positive or negative integer, depending on the direction.

microbit.accelerometer.get_y()
Get the acceleration measurement in the y axis, as a positive or negative integer, depending on the direction.

microbit.accelerometer.get_z()
Get the acceleration measurement in the z axis, as a positive or negative integer, depending on the direction.

microbit.accelerometer.get_values()
Get the acceleration measurements in all axes at once, as a three-element tuple of integers ordered as X, Y, Z.

microbit.accelerometer.current_gesture()
Return the name of the current gesture.

Note

MicroPython understands the following gesture names: “up”, “down”, “left”, “right”, “face up”, “face down”, “freefall”, “3g”, “6g”, “8g”, “shake”. Gestures are always represented as strings.

microbit.accelerometer.is_gesture(name)
Return True or False to indicate if the named gesture is currently active.

microbit.accelerometer.was_gesture(name)
Return True or False to indicate if the named gesture was active since the last call.

microbit.accelerometer.get_gestures()
Return a tuple of the gesture history. The most recent is listed last. Also clears the gesture history before returning.

 

Code

This is a python example which was written in the Mu editor

[codesyntax lang=”python”]

from microbit import *

while True:
    if accelerometer.is_gesture("up"):
        display.show(Image.ARROW_S)
    elif accelerometer.is_gesture("right"):
        display.show(Image.ARROW_E)
    elif accelerometer.is_gesture("down"):
        display.show(Image.ARROW_N)
    elif accelerometer.is_gesture("left"):
        display.show(Image.ARROW_W)
    else:
        display.clear()
    sleep(20)

[/codesyntax]

0 comment
0 FacebookTwitterPinterestEmail
MIcro:bit

Microbit button example

by shedboy71
written by shedboy71

Buttons

There are two buttons on the board, called button_a and button_b.
Attributes

button_a
A Button instance representing the left button.

button_b
A Button instance representing the right button.

Classes

class Button
Represents a button.

Note
This class is not actually available to the user, it is only used by the two button instances, which are provided already initialized.

is_pressed()
Returns True if the specified button button is pressed, and False otherwise.

was_pressed()
Returns True or False to indicate if the button was pressed since the device started or the last time this method was called.

get_presses()
Returns the running total of button presses, and resets this total to zero before returning.

Code

Here is an example written in python using the Mu editor

[codesyntax lang=”python”]

from microbit import *

while True:
    if button_a.is_pressed():
        display.show("A")
    elif button_b.is_pressed():
        display.show("B")
    else:
        display.clear()

[/codesyntax]

 

Here is an example using the Block Editor

0 comment
0 FacebookTwitterPinterestEmail
MicroPython Examples

Micro:bit image examples

by shedboy71
written by shedboy71

Here we show you how to create a custom image on the led matrix, we use the Mu editor

[codesyntax lang=”python”]

from microbit import *
im = Image(‘99999:90009:90009:90009:99999:’)
display.show(im)

[/codesyntax]

You can vary the brightness by changing the value of the digits from 0 – 9.

[codesyntax lang=”python”]

from microbit import *
im = Image(‘99999:96369:96369:96369:99999:’)
display.show(im)

[/codesyntax]

A simple animation example

[codesyntax lang=”python”]

from microbit import *

imgs = [
Image(‘90000:00000:00000:00000:00000:’),
Image(‘00000:09000:00000:00000:00000:’),
Image(‘00000:00000:00900:00000:00000:’),
Image(‘00000:00000:00000:00090:00000:’),
Image(‘00000:00000:00000:00000:00009:’)
]

display.show(imgs, delay=1000,loop=True)

[/codesyntax]
You can also set a pixel and move it around

[codesyntax lang=”python”]

from microbit import *

img = Image('00000:00000:00900:00000:00000:')
display.show(img)
sleep(1000)

while True:
img = img.shift_up(2)
display.show(img)
sleep(1000)
img = img.shift_right(2)
display.show(img)
sleep(1000)
img = img.shift_down(2)
display.show(img)
sleep(1000)
img = img.shift_left(2)
display.show(img)
sleep(1000)

[/codesyntax]
shift_left(n)

Return a new image created by shifting the picture left by n columns.

shift_right(n)

Same as image.shift_left(-n).

shift_up(n)

Return a new image created by shifting the picture up by n rows.

shift_down(n)

Same as image.shift_up(-n).

0 comment
0 FacebookTwitterPinterestEmail