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4.1.16 Morse Code Generator¶

Introduction¶

In this project, we’ll make a Morse code generator, where you type in a series of English letters in the Raspberry Pi to make it appear as Morse code.

Required Components¶

In this project, we need the following components.

../_images/list_Morse_Code_Generator.png

It’s definitely convenient to buy a whole kit, here’s the link:

Name	ITEMS IN THIS KIT	LINK
Raphael Kit	337	Raphael Kit

You can also buy them separately from the links below.

COMPONENT INTRODUCTION	PURCHASE LINK
GPIO Extension Board	BUY
Breadboard	BUY
Jumper Wires	BUY
Resistor	BUY
LED	BUY
Buzzer	-
Transistor	BUY

Schematic Diagram¶

T-Board Name	physical	wiringPi	BCM
GPIO17	Pin 11	0	17
GPIO22	Pin 15	3	22

Experimental Procedures¶

Step 1: Build the circuit. (Pay attention to poles of the buzzer: The one with + label is the positive pole and the other is the negative.)

Step 2: Open the code file.

cd ~/raphael-kit/python

Step 3: Run.

sudo python3 4.1.16_MorseCodeGenerator.py

After the program runs, type a series of characters, and the buzzer and the LED will send the corresponding Morse code signals.

Code

#!/usr/bin/env python3
import RPi.GPIO as GPIO
import time

BeepPin=22
ALedPin=17

MORSECODE = {
    'A':'01', 'B':'1000', 'C':'1010', 'D':'100', 'E':'0', 'F':'0010', 'G':'110',
    'H':'0000', 'I':'00', 'J':'0111', 'K':'101', 'L':'0100', 'M':'11', 'N':'10',
    'O':'111', 'P':'0110', 'Q':'1101', 'R':'010', 'S':'000', 'T':'1',
    'U':'001', 'V':'0001', 'W':'011', 'X':'1001', 'Y':'1011', 'Z':'1100',
    '1':'01111', '2':'00111', '3':'00011', '4':'00001', '5':'00000',
    '6':'10000', '7':'11000', '8':'11100', '9':'11110', '0':'11111',
    '?':'001100', '/':'10010', ',':'110011', '.':'010101', ';':'101010',
    '!':'101011', '@':'011010', ':':'111000',
    }

def setup():
    GPIO.setmode(GPIO.BCM)
    GPIO.setup(BeepPin, GPIO.OUT, initial=GPIO.LOW)
    GPIO.setup(ALedPin,GPIO.OUT,initial=GPIO.LOW)

def on():
    GPIO.output(BeepPin, 1)
    GPIO.output(ALedPin, 1)

def off():
    GPIO.output(BeepPin, 0)
    GPIO.output(ALedPin, 0)

def beep(dt):       # dt for delay time.
    on()
    time.sleep(dt)
    off()
    time.sleep(dt)

def morsecode(code):
    pause = 0.25
    for letter in code:
        for tap in MORSECODE[letter]:
            if tap == '0':
                beep(pause/2)
            if tap == '1':
                beep(pause)
        time.sleep(pause)

def main():
    while True:
        code=input("Please input the messenger:")
        code = code.upper()
        print(code)
        morsecode(code)

def destroy():
    print("")
    GPIO.output(BeepPin, GPIO.LOW)
    GPIO.output(ALedPin, GPIO.LOW)
    GPIO.cleanup()

if __name__ == '__main__':
    setup()
    try:
        main()
    except KeyboardInterrupt:
        destroy()

Code Explanation

MORSECODE = {
    'A':'01', 'B':'1000', 'C':'1010', 'D':'100', 'E':'0', 'F':'0010', 'G':'110',
    'H':'0000', 'I':'00', 'J':'0111', 'K':'101', 'L':'0100', 'M':'11', 'N':'10',
    'O':'111', 'P':'0110', 'Q':'1101', 'R':'010', 'S':'000', 'T':'1',
    'U':'001', 'V':'0001', 'W':'011', 'X':'1001', 'Y':'1011', 'Z':'1100',
    '1':'01111', '2':'00111', '3':'00011', '4':'00001', '5':'00000',
    '6':'10000', '7':'11000', '8':'11100', '9':'11110', '0':'11111',
    '?':'001100', '/':'10010', ',':'110011', '.':'010101', ';':'101010',
    '!':'101011', '@':'011010', ':':'111000',
    }

This structure MORSE is the dictionary of the Morse code, containing characters A-Z, numbers 0-9 and marks “?” “/” “:” “,” “.” “;” “!” “@” .

def on():
    GPIO.output(BeepPin, 1)
    GPIO.output(ALedPin, 1)

The function on() starts the buzzer and the LED.

def off():
    GPIO.output(BeepPin, 0)
    GPIO.output(ALedPin, 0)

The function off() is used to turn off the buzzer and the LED.

def beep(dt):   # x for dalay time.
    on()
    time.sleep(dt)
    off()
    time.sleep(dt)

Define a function beep() to make the buzzer and the LED emit sounds and blink in a certain interval of dt.

def morsecode(code):
    pause = 0.25
    for letter in code:
        for tap in MORSECODE[letter]:
            if tap == '0':
                beep(pause/2)
            if tap == '1':
                beep(pause)
        time.sleep(pause)

The function morsecode() is used to process the Morse code of input characters by making the “1” of the code keep emitting sounds or lights and the “0”shortly emit sounds or lights, ex., input “SOS”, and there will be a signal containing three short three long and then three short segments “ · · · - - - · · · ”.

def main():
    while True:
        code=input("Please input the messenger:")
        code = code.upper()
        print(code)
        morsecode(code)

When you type the relevant characters with the keyboard, upper() will convert the input letters to their capital form.

printf() then prints the clear text on the computer screen, and the morsecod() function causes the buzzer and the LED to emit Morse code.

4.1.16 Morse Code Generator¶

Introduction¶

Required Components¶

Schematic Diagram¶

Experimental Procedures¶

Phenomenon Picture¶