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On this web site you will find code (mostly libraries) and
accompanying projects using PowerBASIC and the PIC Assembly
Language. The keynote project is a PC based Oscilloscope I
call the PPM Scope. You will also find some other hardware
projects, a hardware design resource library, and some tips
for the electronics hobbyist. There are also a couple of
tips in the hardware section for machining or molding your
custom parts and enclosures.
One of my best projects, a digital Oscilloscope. PPMScope is a do-it-yourself oscilloscope design with a maximum sample rate of 1 MHz (bandwidth of 500 kHz).
The hardware is based on the PIC16F877A
Microcontroller. I am creating this
tool for my general use at home, but I thought others may benefit from
the software and schematics. The hardware design
includes a 50 Watt power supply (+12,-12,+5 Volts). I will later add a
function generator (sine, triangle, square) to my scope. The function
generator will be an analog generator with a 50 ohm output
impedance.
The human interface to the oscilloscope is both a part of
the box (knobs, switches, etc) and through a PC program
written in C for Windows.
The scope interfaces with the PC and communicates with the Windows software to
display the captured waveform in the both the time and frequency domains.
The design combines a high frequency analog stage with AC/DC coupling and three gains, a
MAX118 digital to analog converter, a trigger circuit, a PIC16F877A microcontroller, and
some PC interfacing hardware.
The PC program features
cursors, frequency domain representation, optional waveform
reconstruction methodology, single shot and hold modes, X-Y
mode, and various mathematical operation. You can save
your
data or a picture of your waveform as a bitmap.
For development news, please see the comment/development log.
A index of PIC Assembly language macros and libraries for
general use. Many people prefer C over assembly because of its
portability to multiple microcontrollers and because of compiler
optimizations. This library offers macros and code in assembly
with built in portability and optimizations. The idea is to
put the power of assembly in the hands of the programmer, with
some repetative tasks optimized at compile time. Generally,
these libraries make extensive use of conditional compiling and
other features of MPASM.
A index of projects related to or based on Microchip's PIC
microcontroller. If you are just getting started with
PIC microcontrollers, there are a number of resources on
the internet. Check out my links
page for a few.
A index of Powerbasic libraries for general use.
A index of programs written in Powerbasic v.3 for DOS.
Hardware contains alot of miscellaneous information about
building enclosures, components, sensors, and
designing circuits to aid the electronics hobbiest.
Basically a catch all for anything I learn and think is
important enough to share.
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[ Verse of the Day ]
[ Updates ]
Saturday, April 11, 2009 at 10:40 PM -- Released PPMScope 2.12. This is a firmware and software update that expands the capability of the oscilloscope hardware. Enjoy!
Monday, December 01, 2008 at 11:05 PM -- A change in the schematics and PCB to make the hardware more versatile. There were some parallel ports that were not compatible with the old schematics. This version of the PPMScope corrects the problem.
Tuesday, April 15, 2008 at 09:34 PM -- A mistake in the parts list was pointed out to me. I've updated the online help file and the compiled help file with the PPMScope downloads. I'd like to get the next update posted on the site soon but time slips thru my fingers these days.
Friday, May 18, 2007 at 10:11 PM -- Minor bug in the PPM Scope download file (sometimes when you move files around and remove debugging from the code you creat problems). If you've downloaded it in the past couple of days, you will want to download it again. Sorry for the inconvenience.
Wednesday, May 16, 2007 at 11:35 PM -- Finally! The Windows version of PPMScope has been published! It took me long enough :-) Enjoy!
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