Stepper-Driver Settings

Published by Roy Berntsen on

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Jumper Tables:


A4988 – DRV8825

Vref settings

All settings are based on 24V input

For detailed instructions read here: Link

These numbers are approximations for 1.7Amp stepper motors. Use the link above to calculate your own Vref

These settings are for standalone drivers – uart and SPI N/A

Causion: For GND use GND on some other place than the driver – like the GND on the PSU Power-In or similar

On XY:

  • A4988: 0.8-1.2 V – Not tested
  • DRV8825: 0.7-0.8 V
  • TMC2208: 1.1-1.3 V

On Z

  • A4988: 0.4-0.5 V
  • DRV8825 : 0.3-0.4 V
  • TMC2208: N/A – Not tested

The reason for setting vref so low on the Z is to have a failsafe if you should crash your bed high or low as the driver will stop and hopefully you don’t crash to hard and break stuff 🙂

On E

  • A4988: 0.8-1.2 V
  • DRV8825 : 0.7-0.8 V
  • TMC2208: N/A – Not tested
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