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Can I connect MS1, MS2, M3 to GND to use the microstepping function?

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closed as off-topic by ThreePhaseEel, uint128_t, laptop2d, nidhin, DoxyLover Feb 5 '17 at 11:30

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    \$\begingroup\$ I'm voting to close this question as off-topic because it can be answered trivially by reading the datasheet. \$\endgroup\$ – uint128_t Feb 5 '17 at 1:02
  • \$\begingroup\$ You are smart... \$\endgroup\$ – Andy Andy Feb 5 '17 at 1:26
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No, connecting MS1, MS2, MS3 low will NOT enable micro stepping.

If you look at the datasheet for the A4988 you will find all the information you need.

Table 2 shows how the select lines should be set for whatever level if microstepping you require:

enter image description here

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  • \$\begingroup\$ Thank you. But why is CNC V4 using the GND for the MS pins? \$\endgroup\$ – Andy Andy Feb 5 '17 at 0:17
  • \$\begingroup\$ The documentation on the KeyStudio CNC v4.0 is not great, but here's a link to someone building the V3.0 board: blog.protoneer.co.nz/arduino-cnc-shield-v3-00-assembly-guide ....the jumpers are identical on both. I assume they provide you with all three jumpers loaded so you have them. You have to decide whether you want to microstep or not. From what I see here, all three jumpers in place is Full Step. Try it out....you won't blow it up. \$\endgroup\$ – Jack Creasey Feb 5 '17 at 0:34
  • \$\begingroup\$ Thanks Jack. Now I think V4 is a mess, because the back face of the PCB is using GND for microstepping. \$\endgroup\$ – Andy Andy Feb 5 '17 at 1:29
  • \$\begingroup\$ I'm not sure I understand your comment. The MSx pins are pulled high internally on the A4988, you insert the option pin (which connects to Gnd) to pull it low. \$\endgroup\$ – Jack Creasey Feb 5 '17 at 3:05

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