Nema17 1.3A motors only move in one direction

Other Hardware Motors, Mechanics, Power and CNC
1

So I did a setup with 2 nema17 stepper motors at 1.3 A rating, and command them trough a CNC shield V3, 2 A4988 drivers and arduino, with GRBL 1.1 . I power them with 12v 2A power source. They move ok, but only in one direction , no matter the command i Give them they only move in one direction.

Tried adjusting the A4988 but I cannot read the voltage, i put the red terminal on the screw thing, the black on the GND pin and nothing shows up. Is it possible the DIR pin is not getting current? How do I check that?
What should I do ?

2

The first thing to do is to set up the motor driver current limit correctly, following the Pololu video tutorial. You will need a functional multimeter to do that.

If you have an imitation of the genuine Pololu A4988 board, you need to identify and know the value of the current sense resistor.

The A4988 can support only 1 Ampere per winding without forced air cooling, so set the current limit to that value or lower.

3

But I cannot read any voltages from the A4988 driver

4

That would be a problem you need to solve.

Consider posting a close up, focused picture of your board, so that forum members could have some idea what you are talking about.

5

Why not? You have to.

6

Yes but I get 0V, tried connecting them separately with a breadboard and arduino, and same thing, 0 V across the terminal and GND

7

Show where You applied the measuring. 0 volt indicates there's a mistake.

8

So apparently, the arduino was bad. it is strange because it was new..., came with the cnc shield, tried swapping that with another one and now it works both directions, thanks for the help.

9

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