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      You are at:Home»Hardware»Add-ons»Happy Halloween With A Raspberry Pi And Pi-Lite
      Pi-Lite Happy Halloween Example

      Happy Halloween With A Raspberry Pi And Pi-Lite

      1
      By Matt on October 10, 2013 Add-ons, Tutorials & Help

      It’s that time of year when mad inventors start creating Halloween themed electronics projects. I’ve never managed to be organised to do a seasonal project but this year I decided to give it a try.

      So this year I decided to take what I’ve learnt about the Pi-Lite and create a simple Halloween project I can stick in the window along side our more traditional carved pumpkins.

      This post follows on from my previous Pi-Lite articles :

      • How To Setup The Pi-Lite LED Matrix Board
      • Pi-Lite LED Matrix Board Python ‘Hello World’ Example
      • Pi-Lite LED Matrix Board Custom Sprites Example

      TPi-Lite Happy Halloween Exampleo re-create this project you’ll need :

      • Raspberry Pi
      • Pi-Lite
      • SD card (I used the latest Raspbian image)
      • Power supply
      • My Python script

      Python Script

      The following script will display an animated object and then scroll “Happy Halloween !” across the screen. It repeats until CTRL-C is pressed.

      #!/usr/bin/env python
      
      import sys
      import serial
      import time
      
      # Define lists which contain frames of animations
      face   = ['000000000000000000010011000011000100011000110000010110000110110000110110000010110011000110011000100010011000000000000000000000',
                '000000000000000000010000011011000110011000110000010110000110110000110110000010110011000110011000110010000011000000000000000000']
      bat    = ['010000000011000000001100000000110000110110000011111011001111100001111100011111011110110000000110000001100000011000000010000000',
                '000000100000001100000011000000110000110110001011111010001111100001111100011111010110110001000110000000011000000001100000000100']
      ghost  = ['000000000000000000000011111001100001010000010100100010100000001100100001100000010010000010001100001000011111000000000000000000',
                '000000000000000000000011111001100010010000010100000001100100001100000010100100010010000001001100001000011111000000000000000000']
      spider = ['001001000010010010100100101010101000001011110000111001000111000000111000000111001001011110010101000100100101010010010001001000',
                '010010010100100101101001000100101010011011101000111000000111000000111000000111000011011101100101010101001000100100101010010010']
      
      # Combine into dictionary object
      objects = {'face':face,'bat':bat,'ghost':ghost,'spider':spider}
      
      # Define text message to scroll
      message = "Happy Halloween !\r"
      
      # Configure Pi serial port
      s = serial.Serial()
      s.baudrate = 9600
      s.timeout = 0
      s.port = "/dev/ttyAMA0"
      
      def showObject(name,count,delay):
        # Function to display frames from a specified object
        # name  - object to display
        # count - number of times to display object
        # delay - ms to wait between frames
        object = objects[name]for x in range(count):
          for frame in range(len(object)):
            command = "$$$F" + object[frame]+ "\r"
            s.write(command)
            time.sleep(delay)
        # Clear display
        s.write("$$$ALL,OFF\r")
      
      try:
          # Open serial port
          s.open()
      except serial.SerialException, e:
          sys.stderr.write("could not open port %r: %s\n" % (port, e))
          sys.exit(1)
      
      # Turn off all LEDs
      s.write("$$$ALL,OFF\r")
      time.sleep(0.5)
      
      try:
      
        while True:
          # Get list of object names from dictionary
          mykeys = objects.keys()
      
          # Loop through each object
          for x in range(len(mykeys)):
            showObject(mykeys[x],5,0.5)
            time.sleep(1)
            s.write(message)
            # Wait for scrolling message
            time.sleep(8)
      
      except KeyboardInterrupt:
        print("Quit")
      

      Here is a video of the script in action :

      Script Downloads

      Rather than cutting-n-pasting the above script you can also download it directly to your Pi using :

      wget https://bitbucket.org/MattHawkinsUK/rpispy-pi-lite/raw/master/pi_lite_happy_halloween.py

      Or if you use Git on your Pi grab all my Pi-Lite example scripts by cloning my Pi-Lite repository on BitBucket :

      git clone https://bitbucket.org/MattHawkinsUK/rpispy-pi-lite.git

      Modifications

      There are lots of ways you could modify and improve this script. You can change the scrolling message but make sure you adjust the “time.sleep” delay to match. There are more details about how I estimate this time in my hello world scrolling text post. As a rough estimate it is 0.5 seconds per character in your message.

      You could also add other objects by defining new lists and adding them to the dictionary. To generate the 126 character string for each frame you can use my 14×9 LED Matrix Sprite Generator (opens in new window/tab).

      Happy Halloween!

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      Previous ArticlePi-Lite LED Matrix Board Custom Sprites Example
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      1 Comment

      1. Mike on December 5, 2013 3:37 pm

        Many thanks for this, just what I needed to get Xmas going…

        and for those who need, here’s my animated snow fall:


        snow = ['000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
        '000000000000000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
        '000000000000000000100000000010000000100000000000000000000000000000000000000000000000000000000000000000000000000000000000000000',
        '001000000000000000000000000010000000101000000010000000000000000100000000000000000000000000000000000000000000000000000000000000',
        '001010000000100000000000000000000000001000000010100000001000000100000000010000000100000000000000000000000000000000000000000000',
        '000010000000101000000010000000000000100000000000100000001010000000100000010000000101000000010000000000000000000000000000000000',
        '010000000000001000000010100000001000100000000010000000100010000000101000000010000001000000010100000001000000000000000000000000',
        '010100000001000000100000100000001010000000100010000000101000000010001000000010100000001000000100000001010000000100000000000000',
        '000100000001010000100100000010000010100000101000000010001000000010100000001000100000001010000000100000010000000101000000010000',
        '000000000000010000000101000010010000101000001010000010000000001000100000001010000000100010000000101000000010000001000000010100',
        '000000000000000000000001000000010100001001000010100000001000001000000000000010000000101000000010001000000010000000001000000100',
        '000000000000000000000000000000000100000001010000100100001010000000100000000000000000001000000010100000001000000000001000000000',
        '000000000000000000000000000000000000000000010000000101000010010000101000000010000000000000000000100000001010000000100000000000',
        '000000000000000000000000000000000000000000000000000001000000010000001001000010100000001000000000000000000010000000101000000010',
        '000000000000000000000000000000000000000000000000000000000000000000000001000000100000001010000000100000000000000000001000000010',
        '000000000000000000000000000000000000000000000000000000000000000000000000000000000000000010000000101000000010000000000000000000',
        '000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000010000000001000000000',
        '000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000001000000000',
        '000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000000']

        Reply

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