How to set reference voltage RAMPS 1.4/a4988? Hi! I'm setting up a new system. My first. I have Wantai 42BYGHW811 steppers 2.5A. and a new Ramps 1.4 and a4988s. I was told: "These steppers are very good and can handle quite a lot of current. For setting up I always measure the reference voltage on the A4988 module and set them to be 0.45V, this will give you a good starting point for all the axis, it's possible you need to turn it up a little more for the extruder to get some extra force and quick retraction. But start with 0.45V and all the motors should run just slightly warm, not hot. Don't run motor's too hot." I have a multimeter. Can some explain how I can set the REFERENCE Voltage properly? Thank you Maxi https://reprap.org/forum/read.php?219,244492,244492#msg-244492 Sat, 18 Jul 2026 14:27:25 -0400 Phorum 5.2.23 https://reprap.org/forum/read.php?219,244492,554397#msg-554397 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,554397#msg-554397
Dont know why other People's renommend as they do, as it will lead you wrong.

Look af the section configuring vref
[www.instructables.com]

Edit
You properly ruined a driver. Try removing it. With ALL power sources turned OFF]]> dintid RAMPS Electronics Sat, 05 Sep 2015 15:26:07 -0400 https://reprap.org/forum/read.php?219,244492,554119#msg-554119 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,554119#msg-554119 hedron RAMPS Electronics Sat, 05 Sep 2015 01:13:08 -0400 https://reprap.org/forum/read.php?219,244492,245927#msg-245927 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,245927#msg-245927 disneytoy RAMPS Electronics Mon, 16 Sep 2013 22:46:24 -0400 https://reprap.org/forum/read.php?219,244492,245913#msg-245913 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,245913#msg-245913 -------------------------------------------------------
> i
> thought from reading to NEVER use a metal
> screwdriver/ I need a ceramic one which I don't
> have.

You can use a metal one, just be very careful not to short anything.]]> NewPerfection RAMPS Electronics Mon, 16 Sep 2013 21:54:03 -0400 https://reprap.org/forum/read.php?219,244492,245438#msg-245438 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,245438#msg-245438
wishe me luck:-)]]> disneytoy RAMPS Electronics Sun, 15 Sep 2013 00:21:10 -0400 https://reprap.org/forum/read.php?219,244492,245435#msg-245435 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,245435#msg-245435 -------------------------------------------------------
> 1) Do I need to load firmware to the Arduino to be
> able to adjust the driver's voltage?

No.

> 2) So, no 12 v power, just the USB 5v from the
> Arduino?

Yes.

> 3) can this be done without the motor attached?

Yes.

> 4) I looked at the photos but they are blurry. The
> multimeter gets ground from the rail. and the red
> probe goes where? In the photos it is not the Pot?

As Cefiar said, you can use the pot to do the measurement if it is metal (they usually are).]]> NewPerfection RAMPS Electronics Sat, 14 Sep 2013 23:51:23 -0400 https://reprap.org/forum/read.php?219,244492,245253#msg-245253 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,245253#msg-245253
If the pots have a metal screw, you can usually use that part to do your measurement.

If not, the pot will have 3 pins; 2 pins on one side, and 1 pin on the other. You want the one all by itself.]]> Cefiar RAMPS Electronics Sat, 14 Sep 2013 04:28:47 -0400 https://reprap.org/forum/read.php?219,244492,245225#msg-245225 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,245225#msg-245225
1) Do I need to load firmware to the Arduino to be able to adjust the driver's voltage?

2) So, no 12 v power, just the USB 5v from the Arduino?

3) can this be done without the motor attached?

4) I looked at the photos but they are blurry. The multimeter gets ground from the rail. and the red probe goes where? In the photos it is not the Pot?



Thanks

Maxi
]]> disneytoy RAMPS Electronics Sat, 14 Sep 2013 01:47:24 -0400 https://reprap.org/forum/read.php?219,244492,244600#msg-244600 Re: How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,244600#msg-244600 NewPerfection RAMPS Electronics Wed, 11 Sep 2013 18:59:56 -0400 https://reprap.org/forum/read.php?219,244492,244492#msg-244492 How to set reference voltage RAMPS 1.4/a4988? https://reprap.org/forum/read.php?219,244492,244492#msg-244492
I'm setting up a new system. My first. I have Wantai 42BYGHW811 steppers 2.5A. and a new Ramps 1.4 and a4988s. I was told:

"These steppers are very good and can handle quite a lot of current. For setting up I always measure the reference voltage on the A4988 module and set them to be 0.45V, this will give you a good starting point for all the axis, it's possible you need to turn it up a little more for the extruder to get some extra force and quick retraction.

But start with 0.45V and all the motors should run just slightly warm, not hot. Don't run motor's too hot."

I have a multimeter. Can some explain how I can set the REFERENCE Voltage properly?

Thank you

Maxi]]> disneytoy RAMPS Electronics Wed, 11 Sep 2013 13:23:10 -0400