K40 w/mini board and air assist help

[fix-it (Jerry Ducharme)]

Machine: _k40

Board: cohesion3d mini

Firmware: _Smoothie

Problem/ Question: _ i am using lightburn and want to utilize the automatic air assist. how do I wire it up to the board? I am not sure where on the board the output to my relay is. can anyone help with this?

[Cohesion3D]

Please see my reply here:

Wiring Air Assist C3D Mini

Check the config file on the memory card for a section called fan switch with M106 to turn it on and M107 to turn it off. LightBurn uses these commands to turn air on and off. Consult the C3D Mini pinout diagram to identify possible pins to use: [image] As I recall, the default fan pin is 2.6 which is “MOSFET3” in the top right corner. This is small. You can alternatively rename it to 2.7 which is a larger FET along the bottom row. Do not use 2.5 as that is controlling your laser. If yo…

[fix-it (Jerry Ducharme)]

I think that this is above me. Maybe I need to think about getting the larger board that has the spot specified. Thanks for the help. Maybe I will just continue to manually do it for now.

[Cohesion3D]

What is it that you want to control, exactly?

Even with the new board there is still some wiring required and how much will depend on what type of device it is that you want to control.

Have a look at this post and topic:

Laser board and air assist ok K40

Air assist control is explained here: LaserBoard Air Assist Control If you do not want to wire your own relay or SSR, perhaps you could use this:

[fix-it (Jerry Ducharme)]

I want to control the air assist and have it automatically start. I bought a I.O.T. relay to control the compressor but need the board to tell the relay to turn on the compressor. I do not understand going into the config files and such. I am just trying to find out if there is a confirmed spot on the board like the larder one that has air assist marked that I could just connect to the relay. I am learning the software and am very new to all of this. Thanks for the help.

[fix-it (Jerry Ducharme)]

Also that relay is the exact one I bought.

[Cohesion3D]

I have reviewed the default configurations we shipped with the C3D Mini, and it appears that the configuration for the fan is disabled by default:

First, you’d need to change that false to true in the config file.

Then you would need to connect the relay to the board in one of several possible ways.