Content
Background 4
Building instructions 5
OnStep Controller 5
Bill of materials 5
Software 6
Arduino IDE and configuration files 6
Flashing instructions 6
Electrical assembly 7
Connection diagram 7
Figure 1 - Connection diagram 7
Assembly instructions 8
Figure 2 - R1 10k Resistor 8
Figure 3 - Driver Slots Jumper Settings (M0, M1, M2) 8
Figure 4 - LV8729 Driver orientation 9
Figure 5 - LV8729 Resistor locations 10
Figure 6 - Tuning Vref 10
Figure 7 - ST4 Resistor network 11
Figure 8 - ST4 SIP unit soldered to the CNC V3 Shield 11
Figure 9 - OnStep Controller with RJ45 Connectors 12
Figure 10 - Motor brackets with RJ45 Connectors 12
Mechanically assembly 13
3D Printed parts 13
Additional items complimenting my setup, but not related to OnStep directly: 13
Telescope and camera: 13
Thank you! 13