Here's the code to turn your CLUE into a BLE Morse Code chat messenger. You'll also need this BMP image file copied into your CIRCUITPY folder:
See the next page of this guide for info on some minor edits that are required to the code so that the CLUEs have unique names and can find each other. Once you've done that, you can save the code as code.py in your CIRCUITPY folder and it will run automatically when powered up or reset.
Libraries
Make sure you have the following libraries in your CIRCUITPY/lib folder. You can download the latest library bundle here.
Click Download Zip to get the file and image.
import time
import displayio
import terminalio
from adafruit_clue import clue
from adafruit_display_text import label
import adafruit_imageload
from adafruit_ble import BLERadio
from adafruit_ble.advertising.standard import ProvideServicesAdvertisement
from adafruit_ble.services.nordic import UARTService
#--| User Config |---------------------------------------------------
MY_NAME = "ME"
FRIENDS_NAME = "FRIEND"
#--| User Config |---------------------------------------------------
WAIT_FOR_DOUBLE = 0.05
DEBOUNCE = 0.25
# Define Morse Code dictionary
morse_code = {
".-" : "A", "-..." : "B", "-.-." : "C", "-.." : "D", "." : "E",
"..-." : "F", "--." : "G", "...." : "H", ".." : "I", ".---" : "J",
"-.-" : "K", ".-.." : "L", "--" : "M", "-." : "N", "---" : "O",
".--." : "P", "--.-" : "Q", ".-." : "R", "..." : "S", "-" : "T",
"..-" : "U", "...-" : "V", ".--" : "W", "-..-" : "X", "-.--" : "Y",
"--.." : "Z",
}
# BLE Radio Stuff
ble = BLERadio()
uart_service = UARTService()
advertisement = ProvideServicesAdvertisement(uart_service)
ble._adapter.name = MY_NAME #pylint: disable=protected-access
# Display Stuff
display = clue.display
disp_group = displayio.Group()
display.show(disp_group)
# Background BMP with the Morse Code cheat sheet
bmp, pal = adafruit_imageload.load("morse_bg.bmp",
bitmap=displayio.Bitmap,
palette=displayio.Palette)
disp_group.append(displayio.TileGrid(bmp, pixel_shader=pal))
# Incoming messages show up here
in_label = label.Label(terminalio.FONT, text='A'*18, scale=2,
color=0x000000)
in_label.anchor_point = (0.5, 0)
in_label.anchored_position = (65, 12)
disp_group.append(in_label)
# Outging messages show up here
out_label = label.Label(terminalio.FONT, text='B'*18, scale=2,
color=0x000000)
out_label.anchor_point = (0.5, 0)
out_label.anchored_position = (65, 190)
disp_group.append(out_label)
# Morse Code entry happens here
edit_label = label.Label(terminalio.FONT, text='....', scale=2,
color=0x000000)
edit_label.anchor_point = (0.5, 0)
edit_label.anchored_position = (105, 222)
disp_group.append(edit_label)
def scan_and_connect():
'''
Advertise self while scanning for friend. If friend is found, can
connect by pressing A+B buttons. If friend connects first, then
just stop.
Return is a UART object that can be used for read/write.
'''
print("Advertising.")
central = False
ble.start_advertising(advertisement)
print("Waiting.")
friend = None
while not ble.connected:
if friend is None:
print("Scanning.")
in_label.text = out_label.text = "Scanning..."
for adv in ble.start_scan():
if ble.connected:
# Friend connected with us, we're done
ble.stop_scan()
break
if adv.complete_name == FRIENDS_NAME:
# Found friend, can stop scanning
ble.stop_scan()
friend = adv
print("Found", friend.complete_name)
in_label.text = "Found {}".format(friend.complete_name)
out_label.text = "A+B to connect"
break
else:
if clue.button_a and clue.button_b:
# Connect to friend
print("Connecting to", friend.complete_name)
ble.connect(friend)
central = True
# We're now connected, one way or the other
print("Stopping advertising.")
ble.stop_advertising()
# Return a UART object to use
if central:
print("Central - using my UART service.")
return uart_service
else:
print("Peripheral - connecting to their UART service.")
for connection in ble.connections:
if UARTService not in connection:
continue
return connection[UARTService]
#--------------------------
# The main application loop
#--------------------------
while True:
# Establish initial connection
uart = scan_and_connect()
print("Connected.")
code = ''
in_label.text = out_label.text = ' '*18
edit_label.text = ' '*4
done = False
# Run the chat while connected
while ble.connected:
# Check for incoming message
incoming_bytes = uart.in_waiting
if incoming_bytes:
bytes_in = uart.read(incoming_bytes)
print("Received: ", bytes_in)
in_label.text = in_label.text[incoming_bytes:] + bytes_in.decode()
# DOT (or done)
if clue.button_a:
start = time.monotonic()
while time.monotonic() - start < WAIT_FOR_DOUBLE:
if clue.button_b:
done = True
if not done and len(code) < 4:
print('.', end='')
code += '.'
edit_label.text = "{:4s}".format(code)
time.sleep(DEBOUNCE)
# DASH (or done)
if clue.button_b:
start = time.monotonic()
while time.monotonic() - start < WAIT_FOR_DOUBLE:
if clue.button_a:
done = True
if not done and len(code) < 4:
print('-', end='')
code += '-'
edit_label.text = "{:4s}".format(code)
time.sleep(DEBOUNCE)
# Turn Morse Code into letter and send
if done:
letter = morse_code.get(code, ' ')
print(' >', letter)
out_label.text = out_label.text[1:] + letter
uart.write(str.encode(letter))
code = ''
edit_label.text = ' '*4
done = False
time.sleep(DEBOUNCE)
print("Disconnected.")
