<p>I have an Arduino Mega clone and RAMPS 1.4 together with A4988 drivers and NEMA 17 motors which won't move. Motors can be turned easily by hand both when the RAMPS <em>is</em> powered and is not powered. There is ~12&nbsp;V between VMOT and GND on the driver. I don't have multimeter capable of detecting pulses. I have all pins under the driver connected to enable 1/16 steps. I didn't touch the pot on driver.</p>

<p>What I have tried:</p>

<ul>
<li>Using Marlin 1.x, 2.x and RAMPS 1.4 test program <a href="https://reprap.org/wiki/File:RAMPS14_test.zip" rel="nofollow noreferrer">https://reprap.org/wiki/File:RAMPS14_test.zip</a> which lighted up the diodes but didn't move motors.</li>
<li>Different wiring (pin numbering looking on the connector on motor from the shaft side left to right)

<pre><code>2B -- pin 1             2B -- pin 4
2A -- pin 3             2A -- pin 1
1A -- pin 4             1A -- pin 3
1B -- pin 6             1B -- pin 6
</code></pre></li>
<li>Tried to wire driver separately with ATX power supply following this instructable: <a href="https://howtomechatronics.com/tutorials/arduino/how-to-control-stepper-motor-with-a4988-driver-and-arduino/" rel="nofollow noreferrer">https://howtomechatronics.com/tutorials/arduino/how-to-control-stepper-motor-with-a4988-driver-and-arduino/</a> and motors still din't run. This means I either wired it all wrong, fried all my motors or all my drivers. Is that even possible?</li>
</ul>

<p>Can you please help me to find out what's wrong?</p>

CC BY-SA 4.0
2020-03-28T12:55:36.433Z
Please note that the default pot meter position is undefined, it is not tuned or set for use, you need to adjust it.
0scar
CC BY-SA 4.0
2020-03-29T20:40:36.543Z
Thanks! I have DSO138 oscilloscope on the way so I will update the question ASAP.
honza-kasik
<marlin><ramps-1.4><motor>
Stepper motors won't move on RAMPS 1.4
honza-kasik
# Stepper motors won't move on RAMPS 1.4

(Asked by: username_0 on 2020-03-28)

I have an Arduino Mega clone and RAMPS 1.4 together with A4988 drivers and NEMA 17 motors which won't move. Motors can be turned easily by hand both when the RAMPS *is* powered and is not powered. There is ~12 V between VMOT and GND on the driver. I don't have multimeter capable of detecting pulses. I have all pins under the driver connected to enable 1/16 steps. I didn't touch the pot on driver.

What I have tried:

* Using Marlin 1.x, 2.x and RAMPS 1.4 test program <https://reprap.org/wiki/File:RAMPS14_test.zip> which lighted up the diodes but didn't move motors.
* Different wiring (pin numbering looking on the connector on motor from the shaft side left to right)

  ```
  2B -- pin 1             2B -- pin 4
  2A -- pin 3             2A -- pin 1
  1A -- pin 4             1A -- pin 3
  1B -- pin 6             1B -- pin 6

  ```
* Tried to wire driver separately with ATX power supply following this instructable: <https://howtomechatronics.com/tutorials/arduino/how-to-control-stepper-motor-with-a4988-driver-and-arduino/> and motors still din't run. This means I either wired it all wrong, fried all my motors or all my drivers. Is that even possible?

Can you please help me to find out what's wrong?

**Tags:** marlin, ramps-1.4, motor

> **Comments:**
> **username_1**: Please note that the default pot meter position is undefined, it is not tuned or set for use, you need to adjust it.  
> **username_0**: Thanks! I have DSO138 oscilloscope on the way so I will update the question ASAP.  

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## 0 answers

