This blog is about controlling the Stepper Motors using the ULN2803 Chipset and Arduino Nano. I have used the Arduino Nano instead of the Uno for simplicity and there is hardly any code changes except ...

Parts List 1x Etch-a-Sketch 1x Arduino UNO 2x Stepper Motors 1x 12V Power Supply for stepper motors. An old PC power supply works perfectly for this. 1x ULN2803 1x Breadboard 1x Foot of rubber tubing.

After figuring out how to drive the printhead — 5 to 6 μs pulses of 18 volts through a ULN2803 Darlington array driver chip seemed to do the trick — he mounted everything to the gantry of an ...