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Pulse Generator

Download Pulse for Windows
Download Pulse for Macintosh OSX
Requires MAC OS X 10.11 or laterPulse_generator_files/Pulse.app.zip

Pulse Generator is a simple program to use a UART (serial port) as a pulse generator. It requires the UART’s baud rate generator to support arbitrary baud rates. So far the only ones I have found are the FTDI family of USB to serial bridge chips. There is no ability to change the voltage level of the generated pulse beyond selecting different USB to Serial adapters. Adapters are available for 3.3 volt, 5.0 volt, and RS-232 (-10ish to +10ish volts).

Most 3.3 and 5 volt adapters will put out negative going pulses, RS232 adapter will put out positive going pulses. Adapters for RS-422/485 will give you both positive and negative pulses at 5 volts. The Frequency of the pulses is an approximate and has a lot of jitter as it is controlled by your operating system.

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Pulse Generator

If you are connecting to high voltage project or a device not at ground level, you could risk damaging your computer. Then you could use a USB isolator like this: