Mini Project: SOS

Objective

We are going to practice using functions by making our simple LED circuit blink in Morse code.

Wiring

We are going to be using the same circuit as we did in the Blinking LED exercise. The diagrams are provided again here for reference.

Background

Morse code is a system for sending messages as a sequence of ON and OFF signals with predefined spaces in between.

Challenge

Fill in the blanks in the code below. We want to blink the message SOS, so we need to make our LED:

1. blink 3 dots (S)

2. wait for 3 units

3. blink 3 dashes (O)

4. wait for 3 units

5. blink 3 dots (S)

6. wait for 7 units

Coding/Programming

import board

import digitalio

import time

led = digitalio.DigitalInOut(board.D13)

led.direction = digitalio.Direction.OUTPUT

UNIT = .2

def dot():

led.value = True

time.sleep(UNIT)

led.value = False

time.sleep(UNIT)

def dash():

led.value = True

time.sleep(3*UNIT)

led.value = False

time.sleep(UNIT)

while True:

__________

__________

__________

time.sleep(___*UNIT)

__________

__________

__________

time.sleep(___*UNIT)

__________

__________

__________

time.sleep(___*UNIT)

Bonus:

Now that you have functions for dots and dashes, you can blink any message you want! Have fun sending messages!