Python editor for micro:bit

Step 1: Open Python Editor

Open Python editor at: https://python.microbit.org/v/3

Step 2: Add module

Download MicroPython module from GitHub: https://github.com/Bhavithiran97/micropython-rekabit

Click on the Project button in the editor

Click Open button and Add file

Add rekabit.py to the editor

Add from rekabit import * at the top of your program

Neopixel

• This kit has 2 NeoPixels (WS2812B programmable RGB LEDs) built-in.
• REKA:BIT's built-in neopixel works with the default neopixel module that comes with MicroPython on the BBC micro:bit.
• Use import neopixel at the top of your program

Create a NeoPixel strip at pin P8 with 2 LEDs

from rekabit import *
import neopixel

np = neopixel.NeoPixel(pin8, 2)

Show color red on all RGB pixels

from rekabit import *
import neopixel

np = neopixel.NeoPixel(pin8, 2)
for LED in range(2):
	np[LED] = (255,0,0)
np.show()

Show specific color on each RGB pixels

from rekabit import *
import neopixel

np = neopixel.NeoPixel(pin8, 2)
#rainbow color
np[0]= 255,0,0    #red
np[1]= 255,255,0  #yellow

clear all RGB pixels

np.clear()

RGB values for commonly used colors

• red = 255,0,0
• orange = 255,164,0
• yellow = 255,255,0
• green = 0,255,0
• blue = 0,0,255
• indigo = 75,0,130
• violet = 138,43,226
• purple = 255,0,255
• white = 255,255,255
• black = 0,0,0

Find more information about Neopixel's MicroPython module here: https://microbit-micropython.readthedocs.io/en/latest/neopixel.html#module-neopixel

Music

• REKA:BIT's built-in piezo buzzer works with the default music module that comes with MicroPython on the BBC micro:bit.
• Use import music at the top of your program

Play built-in melodies

from rekabit import *
import music

music.play(music.DADADADUM)

Play custom notes

from rekabit import *
import music

#starting tune of "Twinkle Twinkle Little Star"
tune=["C4:1","C4:1","G4:1","G4:1","A4:1","A4:1","G4:1"]
music.set_tempo(ticks=2)
music.play(tune)

Find more information about music MicroPython module here: https://microbit-micropython.readthedocs.io/en/latest/music.html

Digital IO

Read digital pin 9

from rekabit import *

while True:
    if pin9.read_digital():
        display.show(Image.HAPPY)
    else:
        display.show(Image.SAD)

Write digital on pin 12

from rekabit import *

while True:
    pin12.write_digital(1)
    sleep(500)
    pin12.write_digital(0)
    sleep(500)

Find more information about analog MicroPython module here: https://microbit-micropython.readthedocs.io/en/v1.0.1/pin.html#module-microbit

Analog IO

Read analog pin 1

from rekabit import *

while True:
    if pin1.read_analog() > 500:
        display.show(Image.HAPPY)
    else:
        display.show(Image.SAD)

Write analog on pin 2

from rekabit import *

while True:
    pin12.write_analog(511)

Find more information about analog MicroPython module here: https://microbit-micropython.readthedocs.io/en/v1.0.1/pin.html#pulse-width-modulation

DC Motors

from rekabit import *

while True:
	#Move forward at full speed
	run_motor(Motor_All, Direction_Forward, speed=255) 
	sleep(1000)
	
	#Move backward at half speed
	run_motor(Motor_All, Direction_Backward, speed=128) 
	sleep(1000)
	
	#Turn left at full speed
	run_motor(Motor_M1, Direction_Backward, speed=255 )
	run_motor(Motor_M2, Direction_Forward, speed=255 )
	sleep(1000)
	
	#Turn right at half speed
	run_motor(Motor_M1, Direction_Forward, speed=128 )
	run_motor(Motor_M2, Direction=Backward, speed=128 )
	sleep(1000)
	
	#Brake both motors
	brake_motor(Motor_All)
	sleep(1000)

Servos

Rotate Servo 1 to 0 degree when button A is pressed, rotate Servo 1 to 180 degrees when button B is pressed, disable Servo 1 when button A+B pressed

from rekabit import *

while True:
	#Disable all servo when button A and B pressed
	if button_a.is_pressed() and button_b.is_pressed():
		disable_servo(Servo_All)
		
	#Set servo 1 to position 0 degree (min)
	elif button_a.is_pressed():
		sets_servo_position(Servo_S1, position=0 )
		
	#Set servo 1 to position 180 degree (max)
	elif button_b.is_pressed():
		sets_servo_position(Servo_S1, position=180 )

Power Monitoring

This section is for advance user who interested in monitor the power of REKA:BIT.

Show input voltage

from rekabit import *

while True:
	display.scroll(read_Vin())

Show sad face if the voltage is low

from rekabit import *

while True:
	if is_low_batt():
		display.show(Image.SAD)

Show sad face if over voltage

from rekabit import *

while True:
	if is_overvoltage():
		display.show(Image.SAD)

Reset REKA:BIT

Add power_monitor() function in a while loop to monitor the power state of REKA:BIT. The motors and micro:bit will be reset when:

• Power switch is turned off and turned on while both DC barrel plug and micor B is connected
• DC barrel plug is plugged out and plugged in while micro B cable is connected to micro:bit

from rekabit import *

#Move backward at half speed
run_motor(Motor_M2, Direction_Backward, speed=128) 
sleep(1000)

#Brake motor
brake_motor(Motor_M2)
sleep(1000)

while True:
    power_monitor()
	#Move forward at full speed
    run_motor(Motor_M1, Direction_Forward, speed=255) 
    sleep(1000)

    #Brake motor
    brake_motor(Motor_M1)
    sleep(1000)