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Laser cutter from 3D printer wiring issue

Posted by Gorebar 
Laser cutter from 3D printer wiring issue
July 27, 2020 05:19AM
Hi there;

I am trying to convert a 3D printer to laser cutter.

I got this laser module bought from Aliexpress:

[es.aliexpress.com]

I am trying to convert a TEVO TARANTULA 3D printer.

The motherboard is MKS Base v1.2:

[gr33nonline.files.wordpress.com]

I tried to connect the wires to fan plug in the motherboard and the power supply and the laser turns on, but I can't turn it off using Gcode codes (M106/M107). This codes are enabled in firmware (I tested it using a simple fan, and it works) so i guess the problem is with the laser module connections.

This is my connection scheme on attached image

Would you help me to solve the problem?

Best regards.

Álvaro

Edited 2 time(s). Last edit at 07/27/2020 05:21AM by Gorebar.
Attachments:
open | download - Scheme.png (873.6 KB)
Re: Laser cutter from 3D printer wiring issue
July 27, 2020 05:46AM
You cant connect -ve line to power supply -ve

the mosfet switches the -ve line. when you have it wired to the supply -ve it is always on.

I would also expect ttl to be 5v not 12v...

Edited 1 time(s). Last edit at 07/27/2020 06:00AM by Dust.
Re: Laser cutter from 3D printer wiring issue
July 27, 2020 06:10AM
I would try 12v - and + directly to the laser module 12v pins
the 3rd pin I would connect to a pwm capable line eg D11 or D12 on the servo pins and in your firmware set FAN_PIN 11 so you can control it with m106.

but im quite worried you have destroyed the ttl pin with 12v

Edited 1 time(s). Last edit at 07/27/2020 06:12AM by Dust.
Re: Laser cutter from 3D printer wiring issue
July 27, 2020 07:14AM
Hi Dust!

So... to keep safe (anything LOL).

I am a really noob with that, this is my new scheme (attached file). Thats right?

PS: The TTL pin looks good btw hahah

Thanks
Attachments:
open | download - Scheme.png (786.2 KB)
VDX
Re: Laser cutter from 3D printer wiring issue
July 27, 2020 10:05AM
... check the +/- pins on your laser module!!


Viktor
--------
Aufruf zum Projekt "Müll-freie Meere" - [reprap.org] -- Deutsche Facebook-Gruppe - [www.facebook.com]

Call for the project "garbage-free seas" - [reprap.org]
Re: Laser cutter from 3D printer wiring issue
July 28, 2020 05:08AM
Yeah VDX, I checked and looks correct. But I am not sure what is my problem.

I going to change what Dust told me about pin D11.

I'll write again with news.

Thanks!
Re: Laser cutter from 3D printer wiring issue
July 28, 2020 06:07AM
the board seems to indicate that gnd is first pin, +12v is second pin, ttl is 3rd pin.

In your diagram you have first pin as 12v second pin as gnd and third pin as ttl.
Re: Laser cutter from 3D printer wiring issue
July 28, 2020 06:12AM
You are right. My fault drawing the diagram. But its correct in real life LOL.

I'll test then!

Thanks!
Re: Laser cutter from 3D printer wiring issue
August 04, 2020 05:49AM
Well... Thanks for your support! It's working good right now.
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