Micro-bit Network Skills

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Micro-bits Skills

  1. Sending and receiving messages
  2. Using Channels to send and receive messages to and from different micro-bits.

Skill One: Sending and receiving messages

Code for micro-bit ONE

from microbit import *
import radio

# Turn on Radio
radio.on()

while True:

  # button A
	if button_a.was_pressed():
	
    # Send Message
    display.show("A")
    radio.send("Hi!")

Code for micro-bit TWO

from microbit import *
import radio

# Turn on Radio
radio.on()

# wait for a message
while True:
	message = radio.receive()
	
	# Display message
	if message:
		display.scroll(message)

Skill Two: Using Channels

Using Channels to send and receive messages to and from different micro-bits.

Code for micro-bit ONE

from microbit import *
import radio

# Turn on Radio
radio.on()

# wait for button press
while True:

  # button A
	if button_a.was_pressed():
	  # change channel
	  radio.config(channel=12)
	  # send message
		radio.send('TWO')
		
	# button B	
	if button_b.was_pressed():
	  # change channel
	  radio.config(channel=13)
	  # send message
		radio.send('THREE')

Code for micro-bit TWO

from microbit import *
import radio

radio.on()
radio.config(channel=12)

while True:
	message = radio.receive()
		if message:
			display.scroll(message)

Code for micro-bit THREE: Use the same code for micro-bit TWO, just change the channel to 13

Skill Three: Routing messages

Send message from micro-bit ONE to the WAP and the WAP sends the message to the correct micro-bit

Code for micro-bit ONE

from microbit import *
import radio

radio.on()
radio.config(channel=10)
while True:
	if button_a.was_pressed():
		radio.send('TWO:hey')
	if button_b.was_pressed():
		radio.send('THREE:hey')

Code for Router micro-bit 

from microbit import *
import radio

radio.on()
radio.config(channel=10)
while True:
	message = radio.receive()
	if message:
		destination, msg = message.split(':')
		
		if destination = “TWO”:
			radio.config(channel=12)
		if destination = “THREE”:
			radio.config(channel=13)
		radio.send(msg)
		
		radio.config(channel=10)

Code for the two receiver micro-bits:
NOTE: Change the channel to suit the receiver micro-bit

from microbit import *
import radio

radio.on()
radio.config(channel=12)

while True:
	message = radio.receive()
		if message:
			display.scroll(message)

Skill Three: Using a Routing Table

Send message from micro-bit ONE to the WAP and the WAP uses a routing table to send the message to the correct micro-bit

Code for Router micro-bit 

from microbit import *
import radio

routing_table = { 'TWO': 12, 'THREE': 13}

radio.on()
radio.config(channel=10)

while True:
	message = radio.receive()
	if message:
		destination, msg = message.split(':')
		
    new_channel = routing_table[destination]
    radio.config(channel=new_channel)		
		
		radio.send(msg)
    radio.config(channel=10)

TWO digit Display

Each message sent needs to include the following information

  • Sender ID ( ‘A5’ , ‘M15’, ‘E25’)
  • Destination (‘M17’)
  • Payload

# Code for Laptop
from microbit import *

#################################################################################
##                                                                             ##
##                             Two Digit Display                               ##
##                                                                             ##
#################################################################################
                    
# Custom 2-column wide digits (0 to 9)
# 9 represents full brightness, 0 is off
MINI_DIGITS = {
    '0': ["99", "99", "99", "99", "99"],
    '1': ["09", "09", "09", "09", "09"],
    '2': ["99", "09", "99", "90", "99"],
    '3': ["99", "09", "99", "09", "99"],
    '4': ["99", "99", "99", "09", "09"],
    '5': ["99", "90", "99", "09", "99"],
    '6': ["99", "90", "99", "99", "99"],
    '7': ["99", "09", "09", "09", "09"],
    '8': ["99", "99", "00", "99", "99"],
    '9': ["99", "99", "99", "09", "09"]
}

def show_2_digits(number):
    # Ensure it's a 2-digit string (e.g., 7 becomes "07")
    num_str = "{:02d}".format(number)
    
    tens_digit = MINI_DIGITS[num_str[0]]
    ones_digit = MINI_DIGITS[num_str[1]]
    
    # Construct the 5x5 frame string
    # Left 2 cols = Tens, Middle col = Blank (0), Right 2 cols = Ones
    frame_rows = []
    for i in range(5):
          row_str = tens_digit[i] + "0" + ones_digit[i]
          frame_rows.append(row_str)
    
    # Join rows with colons to create a micro:bit Image string
    image_string = ":".join(frame_rows)
    img = Image(image_string)

    # if single digit number just show that number
    if num_str[0] == '0':
      display.show(num_str[1])
    else:
      display.show(img)
      
#################################################################################
##                                                                             ##
##                            END : Two Digit Display                          ##
##                                                                             ##
#################################################################################     
      

import radio

#Modify deviceID to suit
deviceID = 'A17'
deviceClass = deviceID[0]
deviceChannel = int(deviceID[1:])


# Set the deviceID for TWO other devices
destinationAID = 'A16'
destinationBID = 'A18'

# message components
# { senderID, desinationID, payload }
# { 'A7', 'E24', 'Hi'}

#routing_table = { 'A': 5, 'M': 15, 'E': 25}

# Turn on Radio
radio.on()
radio.config(channel=deviceChannel)

display.show(deviceClass)
sleep(300)

while True:
    #display.show(deviceChannel)
    show_2_digits(deviceChannel)

    if button_a.was_pressed():
        destinationID = destinationAID    
        destinationChannel = int(destinationID[1:])
        payload = 'Hi'
        radio.config(channel=destinationChannel)
        radio.send(deviceID + ':' + destinationID + ':' + payload)
        radio.config(channel=deviceChannel)

        
    if button_b.was_pressed():
        destinationID = destinationBID
        destinationChannel = int(destinationID[1:])
        payload = 'Hi'
        radio.config(channel=destinationChannel)
        radio.send(deviceID + ':' + destinationID + ':' + payload)
        radio.config(channel=deviceChannel)

        
        
    msg = radio.receive()
    if msg:
        senderID, desinationID, payload = msg.split(':')
        display.scroll(msg)