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Joined: Sat Mar 21, 2009 11:16 am
|Posted: Sun May 15, 2011 2:58 pm Post subject: Another Python Freebie, (The EM87 Magic Eye Indicator)...
This is a simple piece of Python code that simulates the EM87/6HU6
magic aye valve/tube of yesteryear. It is an animation that displays a
bargraph like in the URL inside the code.
Enjoy finding simple solutions to often very difficult problems... ;o)
This works in Linux AND Windows from a standard Python 3.x.x install.
Watch for wordwrapping etc, etc...
# A simple animation DEMO to simulate the action of a thermionic tuning indicator valve/tube.
# The valve/tube type is EM87, 6HU6, CV10407, 6E2 and other equivalent numbers too.
# Original copyright, (C)2011, B.Walker, G0LCU.
# Issued to LXF, 15-05-2011, under the MIT licence...
# Save the file as MagicEye3x.py in the Lib and/or Modules drawer/directory/folder.
# To test from a normal Python Command Prompt/Terminal call as......
# >>> import MagicEye3x
# ......and away you go and enjoy... ;o)
# Tested on Windows Vista using Python 3.1.2 and Debian Linux using Python 3.1.2.
# Also tested on PCLinusOS 2009 using Python 3.1.2... (All are default installs.)
# This code assumes white foreground and black background colours.
# With careful thought and viewing between Code Page 850, (Windows Vista onwards), and Code Page 437,
# (EFFECTIVELY Linux), one can pick the "graphics" characters to generate some interesting old style
# text mode displays on screen.
# Written in such a way that anyone can understand how it works!
# This code CAN be simplified quite a lot but it has been left as is...
# It is useful for quick glance readings from say an 8 bit ADC used as a simple level
# indicator, for example a tuning and/or level indicator.
# It is at 5 bit depth.
# The commands, "CLS" and "clear" are used and assumed to always be available for both platforms...
# Do any imports for this DEMO as required.
# Just for this DEMO set all variables as global.
# Set the startup variable values.
# tlc == Top lefthand corner character.
# hl == Horizontal line character.
# trc == Top righthand corner character.
# vl == Vertical line character.
# blc == Bottom lefthand corner character.
# brc == Bottom righthand corner character.
# fullbox == Full box character.
# shadebox == Dithered box character.
# count == A re-usable value for this DEMO.
# grab == The psuedo-value to display.
# darkcount == Specific for the shaded "graphics" area only.
magiceye="(C)2011, B.Walker, G0LCU."
# Run continuously until the Ctrl-C keys are pressed.
# Set the platform clear screen command for Linux and Windows.
if sys.platform=="win32": print(os.system("CLS"),chr(13)," ",chr(13),)
if sys.platform=="linux2": print(os.system("clear"),chr(13)," ",chr(13),)
# Randomly generate an 8 bit value as though grabbed from a serial, parallel or USB port.
# Set to a 5 bit value for the DEMO.
# Although no error should ever occur, never allow one.
if grab<=0: grab=0
if grab>=31: grab=31
# Set up the screen per grab.
print("A simple pseudo-EM87/6HU6/6E2 tuning indicator style DEMO for standard Python.")
print("Original working idea copyright, (C)2011, B.Walker, G0LCU.")
print("Designed to work on MS Windows, (Vista 32 Bit), using Python 3.x.x.")
print("Also at least Debian Linux using Python 3.x.x too...")
print(" EM87/6HU6 simulator.")
# Generate the first line of the MagicEye display.
# Now generate the MagicEye start only if the grabbed value is GREATER than 0.
# Do the left hand side very bright part first.
# Now generate the dark centre section.
# Finally finish off with another very bright part.
# When the grab value equals 0 override the above and generate a full dark band only.
# Print the animation to the screen and end with a vertical line.
# Now finish off the MagicEye display...
# Finish the screen display.
print("Press Ctrl-C to STOP...")
# Add a short delay for this DEMO...
# End of MagicEye3x.py DEMO.
# Enjoy finding simple solutions to often very difficult problems. :)
A version for Python 2.5.x and above is up here:-
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