I wanted to add air assist to my China k40 type laser machine. I didn't want to buy an air pump, and I didn't want to have my shop air compressor running all the time dumping air out of the nozzle when it was not running/cutting.

So I set out to find a "trigger" on the main board, to enable an air solenoid. The broad I have in my machine is made by Lihuiyu Studio Labs. Its called the M2Nano. I went to their site to find a pinout of the board. But it was all in Chinese. So will a little editing in Illustrator and Google Translator... I figured it out! I have added it here so everyone can see it.

Turns out the that this board, Ver. 7 has a 5DVC trigger output! Now this is my second China laser, the other has a a Ver. 5 M2Nano board, and it DOES NOT have these connections. So your mileage may vary.

Step 1:

I made this with 100% parts I had laying around. So your results may vary.

I had a 5VDC relay. So I thought I would just hook it up directly to the + & - connector on the board. No joy! It didn't have the capability to powering the coil in the relay. I needed to add a NPN transistor to trigger the relay, and use 5VDC from the laser power supply to power the relay.

I went with the 5VDC because the PSU already outputs 5V, so it seems the easiest way.

The relay, in NO mode, is used to switch a separate 12VDC PCU (wall wort) to power the air solenoid. Since there is no 12VDC output on the laser PSU, this was the easiest way.

It works like a champ!! When the laser starts to cut/engrave, the relay is enabled, and air starts to flow. Once the laser is finished cutting/engraving, the board has a 15 second dwell time before the relay is disabled.

This output can be used to do a lot of other things too... turn on water pump, exhaust fans and more. It can be easily configures to switch a 110v device.

Thank for looking. :)

<p>Thanks for the information. You are the only person I can find on the Internet who knows anything about these controllers.</p><p>I have an 80W Chinese laser cutter that I'm pretty sure has a dead M2 Nano. I accidentally knocked the USB connector, which broke a pin. I've replaced the connector, but it says &quot;Laser is disconnected&quot; I see that there is a component &quot;WR1&quot; connected across the inputs and to ground. The plastic has come away from the die, so I'm assuming that it's been through some sort of overload event, and has cooked the CH341A USB interface chip, which seems to be unobtainable from anyone around here. I've ordered another board from China, but I'm wondering whether it is tied to the dongle somehow. Do you know. Maybe I should have ordered a board and a dongle. My assumption is that the dongle just controls access to Corel Laser. Do you know? Thanks in anticipation!</p><p>Regards</p><p>Denis</p>
<p>i have version 9 of this board but I see you have the same tl+- connector for laser power. Have you sorted out how to control laser power via software so a user can cut and engrave in the same operations and do greyscale work. The laser psu has tl hi/low on it as well with the to low only being connected.</p>
<p>You don't know how much I appreciate this. Trying to do mods to my K40 but obviously everything is in Chinese so...</p>
<p>Cool system. Thanks for sharing.</p>

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