I've also published information and an offer about a small, hobbyist friendly circuit with relays and opto-isolators, which may be of interest. Any use you make of anything you find here must be PLEASE NOTE: You CAN damage your computer if you make ill-advisedĬonnections to it. Also a page specifically about the issues of connecting big computers to microprocessors like the Arduino, etc. I have a much more polished page with information to help you use a parallel port. A detail: References to "me" in the following do not always refer to the editor of this page. Some rough edges have been worn smooth over the years, but is still not typical of my other web-pages. If any of those are your interest, use your browser's "Find on this Page" tool to search for "USB". Over the years, some USB, LAN and TCP/IP stuff has crept in. What follows started as a Hodge-Podge of things I "harvested" from the internet back when I was looking for an answer to accessing the serial port from Windows 95 programs written by me. the Delphi just "wraps" some Windows API calls, so the tutorials should be useful, whatever language you like. While they are most immediately useful to a Delphi programmer, there is little "Delphi cleverness" in them. There's more about these in the Software section of this page. Once you have done that, there's also my tutorial on a program which reads from and writes to a device using the serial port. While some things here can be found elsewhere, it include this link to my essay on writing to the serial port.
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