After making a number of PCBoards using the toner transfer method, I decided it would be nice to have a device to keep the etchant moving. I found designs that ranged from fish tank bubblers to vibrating tables. The one I found that would work best for me was the rocker. I had stepper motors laying around from old printers and I had scrap wood in the shop.
Below are some pictures from the build. I still need to make some type of linkage from the stepper motor to the tank. Right now I just have a piece of wire, but it rubs against the wood and makes a lot of noise.
I was trying to make the pcboard as small as possible, so I could just mount it to the top of the rocker frame. Because of this, I simplified the design to just the necessary components. This may cause problems with reliability in the future, but I will not be using this very often.
The software is very simple. There are two buttons on the board. On startup, the software does not know the position of the motor. So, the first thing you have to do is set the endpoints. The black button is pressed and held until the motor rotates the arm to the upper most position. Next the red button is pressed to set the location. The procedure is repeated for the lower position. After the red button is pressed a second time, the motor will rotate back and forth between the two setpoints. Below is a quick video of the rocker working. It could use some more work, but it will work for now.