Circuitpython Morse Code Transmitter

morse_transmitter_cp.py

import board
import digitalio
import time
from adafruit_clue import clue

import neopixel

start_time = time.monotonic()

letters = {"A":[1,3],"B":[3,1,1,1],"C":[3,1,3,1],"D":[3,1,1],"E":[1],"F":[3,1,1,1],"G":[3,3,1],"H":[1,1,1,1],"I":[1,1],"J":[1,3,3,3],
"K":[3,1,3],"L":[1,3,1,1],"M":[3,3],"N":[3,1],"O":[3,3,3],"P":[1,3,3,1],"Q":[3,3,1,3],"R":[1,3,1],"S":[1,1,1],"T":[3],"U":[1,1,3],"V":[1,1,1,3],"W":[1,3,3],"X":[3,1,1,3],"Y":[3,1,3,3],"Z":[3,3,1,1]}
UNIT_TIME = 0.02

message = ['A','U','T','O','M','A','T','I','O','N']


while True:
    current_time = time.monotonic()
    for letter in message:
        pulse_widths = letters.get(letter)
        for interval in pulse_widths:

            clue.white_leds = True
            time.sleep(interval*UNIT_TIME)


            #clue.play_tone(880,interval*UNIT_TIME)
            clue.white_leds = False
            time.sleep(UNIT_TIME)


        time.sleep(5*UNIT_TIME)
    time.sleep(7*UNIT_TIME)