Z-Axis Add-on (for Emerald Dingo)

A third TMC2130-driven stepper axis for the Emerald Dingo ESP32 Plotter Controller — for a proper pen-lift or tool-height Z axis instead of a solenoid.

• Plugs straight into Emerald Dingo's auxiliary port — I2C + SPI, no extra wiring runs
• Uses the driver's own stall detection for the Z endstop, so no physical limit switch is needed
• Includes its own TMC2130 driver

Requires an Emerald Dingo controller (RevB) — this add-on does not work standalone. If you don't have one yet, it's cheaper to add this option when you buy the controller itself.

Full schematics and KiCad source: z-axis-addon on GitHub.