It comes with 3 A4988 drivers, but you can take them out and insert a DRV8825 with similar pin arrangements. There is no info on whether the spindle PWM pin can drive up to high speeds.ĪnnoyTools 4 is a CNC shield that also supports GRBL 1.1. It can drive your spindle up to 20000RPM with its PWM pin (although you should still check your spindle’s specs), and it supports 3 axes with six limit switches and an E-stop button. Its electronics for directly switching the spindle (spindle enable) are weak (only 24v at 10A), but its PWM is better. It only works on 24v, but this is because it has the necessary electronics to drive a spindle or laser. It has stepper motor drivers soldered on it, but for good reason: it has a fan turning on the stepper motor drivers. This allows you to draw more power from the stepper motor drivers. (If you have earlier versions of GRBL, we have explained how to make a GRBL controller or upgrade it in another article.) If you burn a stepper motor driver, you’ll need to replace the whole CNC shield.ĬNCTOPBAOS 4V is a good CNC shield because it has an in-built fan.
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