Merge pull request #27 from adafruit/collincunningham_additions

Added Morse Code Flasher for Circuit Playground Express

Morse_Code_Flasher/main.py

@@ -0,0 +1,86 @@
+# Circuit Playground Express CircuitPython Morse Code Flasher
+# This is meant to work with the Circuit Playground Express board:
+#   https://www.adafruit.com/product/3333
+# Needs the NeoPixel module installed:
+#   https://github.com/adafruit/Adafruit_CircuitPython_NeoPixel
+# Author: Collin Cunningham
+# License: MIT License (https://opensource.org/licenses/MIT)
+
+import time
+import board
+import neopixel
+
+# Configuration:
+message = 'SOS'                     # Message to display (capital letters and numbers only)
+dot_length = 0.15                   # Duration of one Morse dot
+dash_length = (dot_length * 3.0)    # Duration of one Morse dash
+symbol_gap = dot_length             # Duration of gap between dot or dash
+character_gap = (dot_length * 3.0)  # Duration of gap between characters
+flash_color = (255, 0, 0)           # Color of the morse display.
+brightness = 0.5                    # Display brightness (0.0 - 1.0)
+morse = [('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', '--..'), ('0', '-----'), ('1', '.----'), ('2', '..---'), ('3', '...--'), ('4', '....-'), ('5', '.....'), ('6', '-....'), ('7', '--...'), ('8', '---..'), ('9', '----.')]
+
+# Define a class that represents the morse flasher.
+class MorseFlasher:
+
+    def __init__(self, color=(255,255,255)):
+        #set the color adjusted for brightness
+        self._color = (int(color[0]*brightness), int(color[1]*brightness), int(color[2]*brightness))
+    
+    def light(self, on=True):
+        if on:
+            pixels.fill(self._color)
+        else:
+            pixels.fill((0,0,0))
+        pixels.show()
+        
+    def showDot(self):
+        self.light(True)
+        time.sleep(dot_length)
+        self.light(False)
+        time.sleep(symbol_gap)
+        
+    def showDash(self):
+        self.light(True)
+        time.sleep(dash_length)
+        self.light(False)
+        time.sleep(symbol_gap)
+
+    def encode(self, str):
+        output = ""
+        #iterate through string's characters
+        for c in str:
+            #find morse code for a character
+            for x in morse:
+                if x[0] == c:
+                    #add code to output
+                    output += x[1]
+            # add a space in between characters
+            output += " "
+        #save complete morse code output to display
+        self.display(output)
+         
+    def display(self, code=".-.-.- "):
+        # iterate through morse code symbols
+        for c in code:
+            # show a dot
+            if c == ".":
+                self.showDot()
+            # show a dash
+            elif c == "-":
+                self.showDash()
+            # show a gap
+            elif c == " ":
+                time.sleep(character_gap)
+
+# Initialize NeoPixels
+pixels = neopixel.NeoPixel(board.NEOPIXEL, 10, auto_write=False)
+pixels.fill((0, 0, 0))
+pixels.show()
+
+# Create a morse flasher object.
+flasher = MorseFlasher(flash_color)
+
+# Main loop will run forever
+while True:
+    flasher.encode(message)