morse.py

# created as part of the Future Learn course on Physical Computing with Raspberry Pi
# takes a message entered and flashes it out in morse code to an LED on gpio pin 17
# numbers are missing so only letters work

from gpiozero import LED
from time import sleep
import sys

red_led = LED(17)

def flashdot():
        print "   .dot."
        red_led.on()
        # leave LED on for 0.3s before switching off
        sleep(0.3)
        red_led.off()
        # pause of 0.3s before next letter (same as a dot length)
        sleep(0.3)

def flashdash():
        print "   -dash-"
        red_led.on()
        # leave LED on for 0.9s (3 times dot length) before switching off
        sleep(0.9)
        red_led.off()
        # pause of 0.3s before next letter (same as a dot length)
        sleep(0.3)

def flashchar(char):
        if char == "a":
                flashdot()
                flashdash()
        elif char == "b":
                flashdash()
                flashdot()
                flashdot()
                flashdot()
        elif char == "c":
                flashdash()
                flashdot()
                flashdash()
                flashdot()
        elif char == "d":
                flashdash()
                flashdot()
                flashdot()
        elif char == "e":
                flashdot()
        elif char == "f":
                flashdot()
                flashdot()
                flashdash()
                flashdot()
        elif char == "g":
                flashdash()
                flashdash()
                flashdot()
        elif char == "h":
                flashdot()
                flashdot()
                flashdot()
                flashdot()
        elif char == "i":
                flashdot()
                flashdot()
        elif char == "j":
                flashdot()
                flashdash()
                flashdash()
                flashdash()
        elif char == "k":
                flashdash()
                flashdot()
                flashdash()
        elif char == "l":
                flashdot()
                flashdash()
                flashdot()
                flashdot()
        elif char == "m":
                flashdash()
                flashdash()
        elif char == "n":
                flashdash()
                flashdot()
        elif char == "o":
                flashdash()
                flashdash()
                flashdash()
        elif char == "p":
                flashdot()
                flashdash()
                flashdash()
                flashdot()
        elif char == "q":
                flashdash()
                flashdash()
                flashdot()
                flashdash()
        elif char == "r":
                flashdot()
                flashdash()
                flashdot()
        elif char == "s":
                flashdot()
                flashdot()
                flashdot()
        elif char == "t":
                flashdash()
        elif char == "u":
                flashdot()
                flashdot()
                flashdash()
        elif char == "v":
                flashdot()
                flashdot()
                flashdot()
                flashdash()
        elif char == "w":
                flashdot()
                flashdash()
                flashdash()
        elif char == "x":
                flashdash()
                flashdot()
                flashdot()
                flashdash()
        elif char == "y":
                flashdash()
                flashdot()
                flashdash()
                flashdash()
        elif char == "z":
                flashdash()
                flashdash()
                flashdot()
                flashdot()
        elif char == " ":
                # space between words is represented as a silence the length of 3 dots
                print "   * pause - new word *"
                sleep(0.9)

message = raw_input("Enter message: ")

for letter in message:
        print 'Sending ' + letter
        flashchar(letter)"