Shell Programming and Scripting

You probably meant "1M Log Potentiometer" instead of "!M Log Potentiometer"

AudioScope.sh script statistics so far:-

Total number of lines=3369.
Blank lines=28.
Lines of code=1735.
Commented out lines=1606.
Current filesize=137042 bytes.

AudioScope.sh Version 0.31.40.

Due to the numerous chocies of Linux installs that are now available I have discovered that some do not have 'xterm' installed by default. This has now become a dependency as Linux Mint 17, 64 bit requires that you install 'xterm' if you need to use it.

Also CygWin did not have semi-automatic calibration of the display polarity.
This is now taken care of using the limitations of 'mintty' used in a default install of CygWin.

More done to the Manual including an ultra-simple detector circuit and usage for the display polarity calibration using a MacBook Pro 13 inch ONLY, (in my case circa August 2012). This may or may not work for other platforms but it is NOT intanded for those.
This is in an Appendix at the end of the Manual.

Very soon this code will be able to be used as a fun, calibrated, AC coupled only tool for anyone to use...

As it stands if you have already built the circuits including the Vertical amp then it is a fun, uncalibrated, usable audio OSCILLOGRAPH. ;o)

Calibrating without the kit is ALWAYS the difficult part.

Stas so far:-
Lines=3451.
Blanklines=28.
CodeLines=1745.
Comments=1678.
Filesize=140746 bytes.

Enjoy...

EDIT:

NOTE: Unofficial releases can be found here:-

http://wisecracker.host22.com/public/AudioScope.sh

OK, we now have a major upload here.

The Version is now at 0.31.80. It contains a simple method of calibrating the polarity of the waveform for a MacBook Pro 13 inch only.
See the simple circuit very close to the end of the script/manual...

Although I am aware of many aspects of shell scripting that I didn't know when I first started I have stuck rigidly to the original style.

Some new commands added:-
SHELL - Hidden from the built-in HELP section. Assumes xterm exists.
PLAYBACK - Also hidden from the built-in HELP section. Will playback the 1 second captured waveform.
SAVE - A method to manually save the last capture without having AUTOSAVE enabled.

Now the seriously difficult bit. Yeah, this was NOT easy to make simple!
IMPORTANT! Ensure a signal is at the audio input of the MBP.
The TRIG -> EXT mode.
THIS WILL ONLY WORK USING SOX MODE CAPTURE!
I am assuming SOX is the default capture from now on for this part.
Preamble... It is impossible to obtain a binary value, (or binary value pair), from a stream _in_real_time_ using shell scripting.
So I had to do this in PSEUDO-TRIG mode...
How it works. (<CR> == Carriage Return.)
From COMMAND:-
1) Press <CR> to (re)run, HELP or QUIT<CR> TRIG<CR>
2) Set trigger type, <CR> to disable:- EXT<CR>
The window now clears the previous scan WAITING for the remaining setup.
3) Set trigger polarity, +, - or <CR>:- -<CR>
4) Sync point:- U for up 1, D for down 1, <CR> to RETURN:-

Code:

 +-----------------------------[COMMAND  WINDOW]------------------------------+ 
 | COMMAND:- Sync point:- U for up 1, D for down 1, <CR> to RETURN:-          | 
 +------------------------------[STATUS WINDOW]-------------------------------+ 
 | Stopped...                                                                 | 
 | Synchronisation point set to 87...                                         | 
 +----------------------------------------------------------------------------+

5) After using U or D press...
6) <CR>

Code:

 +-----------------------------[COMMAND  WINDOW]------------------------------+ 
 | COMMAND:-                                                                  | 
 +------------------------------[STATUS WINDOW]-------------------------------+ 
 | Synchroniastion set to 87, EXTERNAL and waiting...                         | 
 | X=Fastest possible, Y=Uncalibrated (m)V/DIV, AC coupled, SOX mode.         | 
 +----------------------------------------------------------------------------+

Now the window hangs until a value, (in this example), 87 is found and the next byte is less than that value, the '-' inputted from 3) above.
It finds those values by capturing a signal at very low resolution, (8000Hz), and if not found keeps recapturing until it has found them.
As soon as they are detected the loop(s) are exited and a new capture at full resolution, (48000Hz), is taken.
Read the code from lines 1311 to 1366 for a more full insight...
Yes it has its limitations and yes there will be a time delay whilst the two values are detected but I could not think of another method.

@Corona688, very early on in this thread you suggested a method of pseudo-continuous capture but it would not work at all with SOX...

File statistics...

# Total Lines=3599.
# Blank Lines=28.
# Code Lines=1841.
# Comments=1730, (including the builtin Manual).
# Filesize=146294 bytes.

Enjoy...

Hi guys and gals...

This is an official release but no circuit has been _drawn_up_ for the VFO yet.
Version 0.32.20.
It shows the DC value to the nearest 0.125V for a 4+ bit depth VFO.

The images show:-
1) The test setup using the very first construction part of this progect as the input board.
2) The '0.000 Volts DC+' in the yellow part of the COMMAND WINDOW.
3) The frequency WRT 2).
4) The '2.000 Volts DC+'.

# Total Lines=3726.
# Blank Lines=29.
# Code Lines=1915.
# Comments=1782, (including the builtin Manual).
# Filesize=151492 bytes.

Enjoy...

Bazza...

EDIT:-
The black box on the bottom RHS is a 0 to 2.5V variable DC source and will be included in the manual in due course for basic calibration of the VFO.

AudioScope.sh Version 0.32.40...
Well The DC Controlled switcher board is now completed.

The circuit is near the end of this script and the code finished to suit the VFO mode of ALTDC DC access.

See here:-
https://www.unix.com/os-x-apple-/2607...oscope-sh.html

A hook up wiring circuit has yet to be done, as is the VFO circuit. In text mode these take a long time to draw and _proof_read_ so bear with me on this one.

Stats so far:-

# Total Lines=3780.
# Blank Lines=29.
# Code Lines=1916.
# Comments=1835, (including the builtin Manual).
# Filesize=154912 bytes.

If you DL the file be sure to put it into your $HOME drawer and rename to AudioScope.sh and to set the executable flags as required.

Bazza...

Hi guys and gals...

Well I have not been entirely idle on this baby but CygWin64 has given me a few minor headaches.

There has been some code changes to prevent some errors inside CygWin, other platforms are not affected...

There is also a cosmetic change to the display...

The white [DISPLAY] section changes to green [STORAGE] mode when stopped in HOLD mode or red [CAPTURE] mode when stopped in RUN mode.
The white [DISPLAY] is still there during plotting and EXT trigger in waiting mode.

The manual has had a little more done to it...

Stats:-

# Total Lines=3797.
# Blank Lines=30.
# Code Lines=1915.
# Comments=1852, (including the builtin Manual).
# Filesize=155775 bytes.

Enjoy...

EDIT:

Added CygWin window of current version.
This uses SoundRecorder.exe in quiet mode...