PulsePar turns a PC into a multi-channel pulse generator utilizing the parallel port. The period, duty and phase of each channel are adjustable so as to be used in PWM systems as well as in testing servo and stepper (stepping) motors.









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The PC interface design is used in small and large scale applications and in more complex environments.
The ability to use a PC interface with external pulse generators is more important today than ever before. All of the recent higher powered PC made smaller and lighter. The PulsePar turns these little PC’s into power equipment. There is no moving parts except for the stepper motor used for the pulse generator. Because the PulsePar is
self contained it eliminates the need for the pulse generator that a lot of people are use to having. In many applications the PulsePar has a PC interface. I often use that interface to build my own PC equipped with a real integrated voltage regulator and a PC program that can control the output voltage of the PulsePar from a PC. This product is the highest quality pulse generator in the market today.

PulsePar Features:

Fast Pulse Generators

The PulsePar is a fast multi channel pulse generator. The period, duty and phase are adjustable. You can get a pulse as short as 15ms and up to 6KHz. All you have to do is specify the period, duty and phase. Once this information is
input into the program it will output it to the PulsePar pulse generator.

Can be Used in Standalone Applications

The PulsePar can be used in many applications; it is an I^2C controlled pulse generator. You can output the data from the PC to a PC equipped with the PulsePar interface or send the data to the PC using the USB interface.


The PC interface allows you to build with the PulsePar in a PC.


The software controls the PC interface and can be accessed through the I^2C bus or USB.

Large or Small

The PulsePar has two interfaces, USB and I^2C. Each interface is self contained and independent of one another. Any one of the two interfaces can be configured on the PC interface. If you have a PC that can read and write data to the PC interface you can build your own
own PC with the PulsePar interfaced. There is no limit to the size or number of channels in the PulsePar.


Integrated interface where all controls and data is output through the PC interface

Dual Interface

I^2C and USB interfaced

Main Options:

2ms period

Period can be changed from 0 – 10,000ms

15ms per channel

PulsePar Product Key Full

PulsePar is a digital circuit that can be connected to a computer parallel port (computer has an enhanced parallel port) to generate pulse waveforms (pulses) up to 3.3 milliseconds in duration. The pulse width (duty cycle) may vary from 1% to 100% of the pulse period. The pulse phase (the phase of the pulse relative to the previous pulse) can vary from 0 to 360 degrees. The pulse frequency is selectable from 1 to 2000 pulses per second (p/s). The maximum frequency is limited by the sampling rate (p/s) and the system clock of the computer.
PulsePar Specifications:
The basic parameters of PulsePar are:
1. Pulse Width (Duty cycle): PulsePar has a pulse width of selectable in the range from 1% to 100% of the pulse period. (A duty cycle of 1% results in a pulse that is 1 millisecond in duration)
2. Pulse Frequency: The pulse frequency is selectable from 1 to 2000 p/s.
3. Pulse Phase: The pulse phase can vary from 0 to 360 degrees.
PulsePar Output:
The pulse width (duty cycle), pulse frequency and pulse phase are digitally generated and sent to the parallel port, so PulsePar can be interfaced to any parallel port equipped computer (e.g. Windows, Macintosh, OS/2, etc.). The output waveforms on the parallel port are generated synchronously with the system clock of the computer.
PulsePar Features:
With a parallel port interface, PulsePar is simple to use in any parallel port equipped computer. No additional hardware or software is required.
PulsePar is a low current device that draws only 25 microamps from the 5 volt supply.
With an internal 3.3 volt power supply PulsePar is ready for use from the factory.
PulsePar is built to a high cost of quality to ensure stability and reliability.
All parts are readily available.
PulsePar is a digital design. The processor is a sample and hold oscillator. This means that the duty cycle, pulse frequency and pulse phase are programmable. PulsePar is capable of generating to a maximum of 1000 p/s.
The analog signal, the output of the oscillator, is then digitized by an 8 bit A/D converter.
The digital circuit can generate a pulse of a fixed duty cycle, with a frequency from 1 to 2000 p/s, and a pulse phase angle

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#1. Features:
1.Change duty and period of each channel.
2.Change the phase of each channel.
3.Detect current direction of each channel.
#2. Connecting pins:
1. Power of PC pins:
– ATX connector (connection depends on the model of PC)
– the first pin of the parallel port (usually will be ground)
– On the motherboard of the computer, the two first pins of the parallel port may be ground (the connections of the parallel port may differ by the motherboard).
#3. The program:
Parallel Port 1 program is named as pulse1.c. The program is an Input-Output driver program.
Version 1.1 (9/1/2009):
Added the ID of the PWM clock source to the program
Added the ID of the serial port as a parameter of PARALLEL_PARAMETERS() function.
Added the checking of the input signal of each channel.
Added a new function PARALLEL_GET_INPUT_CHANNEL().
Version 1.0 (9/1/2009):
A. The definition of the PulsePar input signal
B. A debugging function
Version 1.0 (6/19/2009):
The function PARALLEL_GET_INPUT_LINE() added to the reading of the input signal of each channel.
Added the function of reading the parameters.
Improved the structure of the program.
The program crashes when input signal is 0.
The output line as well as the input of parallel port is wrong.
#3. The Problem:
When input signal changes from 0 to 1, the output signal still shows the voltage between 0 to 5 Volts.
When input signal changes from 1 to 0, the output voltage is normal.
When input signal changes from 1 to 1, the output signal changes of 1 to 5 Volts.
#4. The Solution:
1. Change the definition of output signal.
2. Change the definition of the input line.
#5. Compile the program with gcc.

PulsePar turns a PC into a multi-channel pulse generator utilizing the parallel port. The period, duty and phase of each channel are adjustable so as to be used in PWM systems as well as in testing servo and stepper (

What’s New in the PulsePar?

• Sends high voltage pulses through a PC parallel port, typically using a 3.3V output.
• Multiple simultaneous and independent pulse signals are possible in one port.
• Multiple channels share the port and are not automatically ‚grouped‘ together.
• Channels can be set to send either pulse in phase or not.
• A timer can be set for the duration of the pulse.
• Clock in delay (sample and hold) is adjustable from 0-10 seconds and internal oscillator is adjustable to 12Mhz-24Mhz and 1Mhz-16Mhz.
• Power consumption is about 250uA/1ms and signal outputs range from 0.8V-3.3V.
• An individual LED can be controlled to blink when a pulse is on by connecting to any channel and adjusting the LED function to the desired value.
• Both input and output can be connected to ground or put in series with a resistor and be AC or pulsed (pulse +- 30V, pulse time in nanoseconds, 1 millisecond is used as the default).
• The pulse width can be adjusted.
• Channel count can be varied.
• Normally all channels will be pulsed at once but on/off timing can be used if desired.
• FFT on the output will produce a spectrum and average and peak voltages will be shown and the actual pulse duty output can be displayed as a graphical graph.
• The frequency limit of the oscillator is about 1/4 of the available clock.
The clock frequency can be modified to any value less than 1MHz.
1. On Windows only X86 (i486, Pentium or later) and Linux (2.6.x or later) are supported.
2. The user is responsible for choosing a suitable timer for their needs. 1MHz is about the upper limit.
3. The PWM signal output (default is 7LED VCC) can be changed to any digital value or PWM on any position.
4. There is only one oscillator per port.
5. 1n4001 diode is required.
6. Channel counts up to 32 are available and can be set in any combination.
7. Voltage is limited to 3.3V.
8. Power consumption is about 250uA/1ms and signal outputs range from 0.8V-3.3V.
9. Can use the timer

System Requirements For PulsePar:

Minimum Requirements:
Mac OS X 10.8
2GB free space
2GB free memory
Minimum System Specifications:
CPU: 3 GHz Intel Core i5
Hard Disk Space: 20 GB free space
Minimum Graphics Card: 256MB or higher
Video Card: DirectX 9.0c
Drivers: HD 4800 or higher or NVIDIA 7300 series or higher
Display: 1024 x 768 or higher
Multi-core Processor: Yes
Playable on


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