WARNING!!! The DRO-350 is an old design that uses obsolete parts. The DRO-350 has a number of problems including scale jitter, rounding errors, and axes that won't display. These problems will not be fixed and all future development activity will concentrate on the DRO-375 and DRO-550. The new DRO's completely solve all of these problems and adds a huge list of new features.
The DRO-350 is a three-axis digital read-out (DRO) for import Chinese scales and most quadrature encoders that is designed to be as capable as commercial DROs but be a low cost alternative for the metal-working hobbyist. The
The DRO-350 is a three-axis digital read-out (DRO) for import Chinese scales and most quadrature encoders that is designed to be as capable as commercial DROs but be a low cost alternative for the metal-working hobbyist. The DRO-350 is a do-it-yourself (DIY) project, not a complete, commercially manufactured product. All of the components necessary to build it are commonly available at Digikey, Mouser, or other electronics distributors. The printed circuit board (PCB) is specifically designed to use only DIP devices to make it easier for a hobbyist to assemble. The construction process is shown in step-by-step detail on the construction page and it is easy enough for somebody with basic electronics experience to build. If you don't feel comfortable building one yourself, you can send an e-mail to the ShumaTech Yahoo! group to see if someone is willing to build one for you.
The DRO-350 is an open project with the schematics, software, and PCB files (Gerbers) freely available for download at this site. One of the more exciting aspects of the DRO-350 is that the firmware is easily upgradeable over a serial port. This allows for continued development of the software and should allow the DRO-350 project to grow over time. Software is available for both Windows and Linux and you need only a 9 pin serial cable to connect the DRO-350. The following list highlights the features designed into the DRO-350.