Some people consider PCB etching as a tedious task. One has to have extra care in handling the etchant – which stains, one needs to keep an eye on it to avoid over etching and one needs to rock the etching pan to speed up the etching process.
To make life a lot easier for hobbyists Graham came up with an ingeniously simple way of automating the rocking motion for the etching pan. He attached a servo motor on a pivot where the etching pan can tilt on both directions. Using a PIC18F2620 to send digital pulses he controls the back and forth motion of the servo which in turn gives the etching pan a rocking motion. Rock A By etching pan.