David S Gamble

I have built a focuser using a "Seeeduino Nano" USB3. It is attached to my SVBoney 106 using a toothed belt. The 28BYJ-48 has a 6 to 1 reduction buit in and the belt drive gives an additional reduction of 2.87. This equates to approximately 0.1 degrees per step. I initially hoped that the belt friction on the knurled helical focus would be sufficient but in the end I glued a strip of toothed belt onto the knob. I used a scrap of Vero board for the circuit , The wiring is very simple, 4 control wires...

I have built a focuser using a "Seeeduino Nano" USB3. It is attacher to my SVBoney 106 using a toothed belt. The 28BYJ-48 has a 6 to 1 reduction buit in and the belt drive gives an additional reduction of 2.87. This equates to approximately 0.1 degrees per step. I initially hoped that the belt friction on the knurled helical focus would be sufficient but in the end I glued a strip of toothed belt onto the knob. It works well. The stepper has plenty of torque and for less than $5 is easily relaced...

I have built a focuser using a "Seeeduino Nano" USB3. It is attacher to my SVBoney 106 using a toothed belt. The 28BYJ-48 has a 6 to 1 reduction buit in and the belt drive gives an additional reduction of 2.87. This equates to approximately 0.1 degrees per step. I initially hoped that the belt friction on the knurled helical focus would be sufficient but in the end I glued a strip of toothed belt onto the knob. It works well. The stepper has plenty of torque and for less than $5 is easily relaced...

You should be able to use the ULN2003 driver and a 28BYJ-48 stepper motor. Some Nano builds use a USB-C connection which provides plenty of power. This would be an extremely low cost build. I plan to give it a go! Cheers