<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

