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 Rohit Gupta needed a way to speed up PCB etching. Heating the etchant and agitating it are both well known ways of speeding up the process. If you are on a DIY budget this normally means you will be stuck sloshing the etchant back and forth for 10 minutes or so. Rohit developed the Open Agitator which uses a CD-ROM Drive Drawer to shake a tray back and forth. A MSP430 microcontroller and an L293D H bridge motor controller are used to power the CD-ROM drive motor, recycled mouse buttons are used as end stop sensors. This is a great project since is simply adds a simple circuit to a platform that most of us have laying around in our junk bins.Â
Via: Dangerous Prototypes
